Colorado Running Races

599 upcoming races across Colorado in the next 12 months, from local 5Ks to marathons and ultras. Updated nightly. Want filters, maps, and radius search? Open Colorado in the Race Finder.

July 2026

Wed 7/22Mineral Springs Walking TourSteamboat Springs, CO
Wed 7/22Horsetooth Tri Training Open Water Swim SeriesFort Collins, CO
Thu 7/23Durango Brewer's Trail SeriesDurango, CO · Other · 10K · 5K
Thu 7/2314er ChallengeBuena Vista, CO · Other
Thu 7/23BRR All-Comers Summer Track & Field Series #4Boulder, CO · Other · 1 Mile
Thu 7/23July 23 - Beginner / Advanced @ Cheyenne Mountain State ParkColorado Springs, CO
Thu 7/23July 23 - Intermediate @ UteColorado Springs, CO
Fri 7/24Never Summer 100km & 60kmWalden, CO · Ultra · 100 Mile
Fri 7/24Flyin' Ryan Memorial 5kLoveland, CO · 5K
Fri 7/24Ranger Roundtable - River Run ParkCommerce City, CO
Sat 7/25Pikes Peak UltraColorado Springs, CO · 50 Mile · 50K · Other · Half Marathon
Sat 7/25Christmas 5K/10K/Half Marathon in July Meet Up - DenverLittleton, CO · 5K · 10K · Half Marathon
Sat 7/25Run for Coffee Lovers 5K/10K/13.1 DENVER/AURORACentennial, CO · 5K · 10K · Half Marathon · 1 Mile
Sat 7/25Run for Donuts 5K/10K/13.1 DENVER/AURORACentennial, CO · 5K · 10K · Half Marathon · 1 Mile
Sat 7/25Aspen Valley MarathonAspen, CO · Marathon · Half Marathon · 5K
Sat 7/25Grand Mesa UltrasGrand Mesa, CO · 50 Mile · 50K · Other
Sat 7/25Bob Cook Memorial Blue Sky Hill ClimbIdaho Springs, CO · Marathon
Sat 7/25Creede 50/100Creede, CO · 100 Mile
Sat 7/25Audi Snowmass 50 Mountain Bike RaceSnowmass Village, CO · 50 Mile · Other
Sat 7/25San Juan Gravel ClassicRidgway, CO · Other · 50 Mile
Sat 7/25The Hero's Journey 5KAurora, CO · 5K · Other
Sat 7/25Golddigger 5KIdaho Springs, CO · 5K · Other
Sat 7/25Beas Knees Citizens' Race and National High School Trail ChampionshipsSalida, CO · Other
Sat 7/25Box Canyon Trail RacesTelluride, CO · Other
Sat 7/25CEROX + IRONFrederick, CO
Sat 7/25MOUNTAIN FAIR 4-MILERCarbondale, CO · Other
Sat 7/25Newbie to 5kPueblo, CO · 5K
Sat 7/25Staunton 10 Mile Trail Race - 7/25/26Pine, CO · Other
Sat 7/25Staunton 5k Trail Race - 7/25/26Pine, CO · 5K
Sat 7/25Living Journeys 2026 Summit HikeCrested Butte, CO
Sat 7/252nd Annual Pancreatic Cancer Awareness in Honor of Diana Cantu - 5K Fun Run/WalkAlamosa, CO · 5K
Sat 7/25Aspen parkrunAspen Recreation Centre, CO · 5K
Sat 7/25South Boulder Creek parkrunSouth Boulder Creek, CO · 5K
Sun 7/26World Championship Pack Burro RaceFairplay, CO · 50K · Other
Sun 7/26Bird to Bird – Gravel Bike RideCrested Butte, CO · Ultra
Sun 7/26Spirit of the West 5K Run/WalkGolden, CO · 5K · Other
Sun 7/26SIC Mile/2 Mile Run or WalkPueblo, CO · Other
Mon 7/27The Summit 200Frisco, CO · Ultra
Mon 7/27Week 09 | Ages 12-15 | 10am-2pm @ LouisvilleLouisville, CO
Mon 7/27Week 09 | Ages 8-11 | 10am-2pm @ LouisvilleLouisville, CO
Mon 7/27The Jungle BookTelluride, CO
Wed 7/29HRCA Badlands CircuitHighlands Ranch, CO
Wed 7/292026 STRS #4 - Tom's BabyBreckenridge, CO
Wed 7/29Mineral Springs Walking TourSteamboat Springs, CO
Thu 7/30July 30 - Beginner & Skills / Advanced @ Ute Valley ParkColorado Springs, CO
Thu 7/30July 30 - Intermediate @ Palmer ParkColorado Springs, CO
Fri 7/31Wild West RelayFort Collins, CO · 100+ Mile
Fri 7/31Peak to Peak All Comers MeetNederland, CO · Other · 1 Mile · 5K

August 2026

Sat 8/1Aspen BackcountryAspen, CO · 50K · Marathon · Half Marathon
Sat 8/1Winter Park 50KWinter Park, CO · 50K · Half Marathon · 10K
Sat 8/1Sheep Mountain Trail RunsFairplay, CO · Other · 50K · 50 Mile
Sat 8/1Popsicle 5K/10K/Half - Colorado SpringsColorado Springs, CO · 5K · 10K · Half Marathon
Sat 8/1Boggy Draw Beat DownDolores, CO · 50K · Other · 5K
Sat 8/1Popsicle 5K/10K/Half Marathon -Colorado SpringsColorado Springs, CO · Half Marathon
Sat 8/112th Annual Run for the RingAurora, CO · 5K
Sat 8/1Move with MADD Denver 5KDenver, CO · 5K
Sat 8/1STEPS TO EMPOWERColorado Springs, CO · 1 Mile · 5K
Sat 8/1Unicorn 5k (South)Highlands Ranch, CO · 5K
Sat 8/12026 Rocky Mountain Strength RendezvousLittleton, CO · 5K
Sat 8/12026 SKECHERS Wicked Wine Run DenverDenver, CO
Sat 8/1Nielson ChallengeColorado Springs, CO · Other
Sat 8/1RunAbilities FUN Walk/Run/RollParker, CO · Other
Sat 8/1Shootout for Soldiers ColoradoLittleton, CO
Sat 8/1Kennebec Mountain RunHesperus, CO · Other
Sat 8/1Snowshoe Shuffle 5K RunCreede, CO · 5K
Sat 8/1Flying Colors 5K Fun Run/WalkCraig, CO · 5K
Sat 8/1Aspen parkrunAspen Recreation Centre, CO · 5K
Sat 8/1South Boulder Creek parkrunSouth Boulder Creek, CO · 5K
Sun 8/2Bound for Boston Marathon & Half Marathon - DenverDenver, CO · Marathon · Half Marathon
Mon 8/3Boulder Kids' Tri CampBoulder, CO
Tue 8/4Eltuck Valley 5K - Lory Summer Trail SeriesFort Collins, CO · 5K
Wed 8/5Mineral Springs Walking TourSteamboat Springs, CO
Thu 8/6Eldorado Run for the CureEldorado Springs, CO · Other
Thu 8/6Aug 6 - Beginner & Advanced @ StrattonColorado Springs, CO
Thu 8/6Aug 6 - Intermediate @ Cheyenne Mountain State ParkColorado Springs, CO
Thu 8/6BRR All-Comers Summer Track & Field Series #5Boulder, CO · Other · 1 Mile
Fri 8/7Choice City Running FestivalFort Collins, CO · 1 Mile · Half Marathon · 10K · 5K
Fri 8/7High Five 100Lake City, CO · 100 Mile
Fri 8/7RMRR August 5km and picnicCentennial, CO · 5K
Sat 8/8All-Out RunapaloozaArvada, CO · Half Marathon · 10K · 5K
Sat 8/8Summer Sizzler- DenverThornton, CO · Other · 1 Mile · 5K · 10K
Sat 8/8Georgetown to Idaho Springs Half Marathon 2026Idaho Springs, CO · Half Marathon
Sat 8/8Arapahoe Warrior 5KCentennial, CO · 5K
Sat 8/8Dog Days of SummerLongmont, CO · 5K · Other
Sat 8/8Eat. Run. Adopt. 10KBerthoud, CO · 10K
Sat 8/8Pat's Pony ExpressWoodland Park, CO · Other
Sat 8/85K at the FairDurango, CO · 5K
Sat 8/8Dirt Circus - BoulderBoulder, CO
Sat 8/8Escalante Days 5KDolores, CO · 5K
Sat 8/8Run to the Rails 5K (Sat)Strasburg, CO · 5K
Sat 8/8Fort Collins Running SummitFort Collins, CO
Sat 8/8HRCA Splash Mash Dash Kids TriathlonLittleton, CO
Sat 8/8Aspen parkrunAspen Recreation Centre, CO · 5K
Sat 8/8South Boulder Creek parkrunSouth Boulder Creek, CO · 5K
Sun 8/9Leadville Boomdays International Pack Burro RaceLeadville, CO · Other
Sun 8/9Summer Sizzler- Colorado SpringsColorado Springs, CO · Other · 1 Mile · 5K · 10K
Sun 8/9The Berkeley CircuitDenver, CO · Other · 1 Mile
Sun 8/9The Bullfrog Summer SurgeLakewood, CO · 5K · Other
Sun 8/9Pancake Stampede 5KLittleton, CO · 5K
Sun 8/9'BURG 5K (Sunday)Strasburg, CO · 5K
Mon 8/10Week 11 | Ages 12-15 | 10am-2pm @ LouisvilleLouisville, CO
Tue 8/11Into the Hills Eltuck 10kBellvue, CO · 10K
Wed 8/122026 STRS #5 - Carter Park ScurryBreckenridge, CO
Wed 8/12Mineral Springs Walking TourSteamboat Springs, CO
Thu 8/13Aug 13 - Beginners / Advanced @ PalmerColorado Springs, CO
Thu 8/13Aug 13 - Intermediate @ Red RocksColorado Springs, CO
Fri 8/14San Juan Softie 100Durango, CO · 100 Mile
Fri 8/14South Fork PandemoniumSouth Fork, CO
Sat 8/152026 CKF Leadville Trail 100 MTBLeadville, CO · 100 Mile
Sat 8/15Bagel Run 5K/10K/13.1 DENVER/AURORACentennial, CO · 5K · 10K · Half Marathon · 1 Mile
Sat 8/15Run for PB& J 5K/10K/13.1 DENVER/AURORACentennial, CO · 5K · 10K · Half Marathon · 1 Mile
Sat 8/15Roxborough UltrasLittleton, CO · 50 Mile · 50K
Sat 8/15Westminster Trail RacesWestminster, CO · 50K · Other · 5K
Sat 8/152026 Mt. Sneffels Half Marathon-10K-Kids-Fun RunRidgway, CO · Half Marathon · 10K · 1 Mile
Sat 8/15The Cheyenne Mountain RunColorado Springs, CO · 5K · 10K · Other
Sat 8/15Farish Mt Bike RaceWoodland Park, CO · 10K · Other
Sat 8/15MOCO Trails Wild West Backyard UltraCraig, CO · Ultra
Sat 8/15Miles for Migraine ColoradoDenver, CO · Other · 5K
Sat 8/15ThunderRidge Grizzly 2 MileHighlands Ranch, CO · Other · 1 Mile
Sat 8/15Sunrise StampedeLongmont, CO · 5K · 1 Mile
Sat 8/15Miles for Migraine - Colorado 2026Denver, CO · Other · 5K
Sat 8/15Never Alone Foundation 5k At MVP 2026North End Park, CO · 5K
Sat 8/15Frontier Academy Community 5KGreeley, CO · 5K
Sat 8/15Yuma Police Department Donut 5kYuma, CO · 5K
Sat 8/15CWCS 5K Color Fun RunMontrose, CO · 5K
Sat 8/15Aspen parkrunAspen Recreation Centre, CO · 5K
Sat 8/15South Boulder Creek parkrunSouth Boulder Creek, CO · 5K
Sun 8/16Erie Half & 5kErie, CO · Half Marathon · 5K
Sun 8/16Cancer League of Colorado Race 4 ResearchDenver, CO · 5K
Tue 8/182026 Fall Cheer - Valor Mini Cheer ClinicHighlands Ranch, CO
Tue 8/18Into the Hills Eltuck 5kBellvue, CO · 5K
Wed 8/19La Garita 200South Fork, CO · Ultra
Wed 8/19HRCA Wildcat CircuitHighlands Ranch, CO
Wed 8/19Mineral Springs Walking TourSteamboat Springs, CO
Thu 8/20Aug 20 - Advanced @ ABOSColorado Springs, CO
Thu 8/20Aug 20 - Beginners @ PineriesColorado Springs, CO
Thu 8/20Aug 20 - Intermediate @ StrattonColorado Springs, CO
Thu 8/20Lucky Day Out: Casino ExcursionEvergreen, CO
Sat 8/22Staunton Rocks! Marathon and Half MarathonPine, CO · Marathon · Half Marathon
Sat 8/22Byers Peak Stampede Half Marathon & 5K RunFraser, CO · Half Marathon · 5K
Sat 8/222026 True Impact Ministries 5K/10KCentennial, CO · 5K · 10K
Sat 8/22Bergen Peak Half Marathon Trail Race - 8/22/26Evergreen, CO · Half Marathon
Sat 8/22Telluride Mountain RunTelluride, CO · Other · Ultra
Sat 8/22Jog in the Bog 5kWestminster, CO · 5K
Sat 8/22Ram RunDenver, CO · 5K · 1 Mile
Sat 8/22Coyote Chase 5kLouisville, CO · 5K
Sat 8/22Rocky Mountain Lobo InvitationalFort Collins, CO · 5K · 1 Mile
Sat 8/22Bergen Peak 5k Trail Race - 8/22/26Evergreen, CO · 5K
Sat 8/22CEROX IRON + IRON XFrederick, CO
Sat 8/22Warrior Waterfront 5KGrand Junction, CO · 5K
Sat 8/22Gunnison Valley TriathlonGunnison, CO
Sat 8/22Aspen parkrunAspen Recreation Centre, CO · 5K
Sat 8/22South Boulder Creek parkrunSouth Boulder Creek, CO · 5K
Sun 8/23Pioneer Prairie Dog Half, 10k & 5kWestminster, CO · Half Marathon · 10K · 5K
Sun 8/23Rumble at the Ranch - 6 Hour MTB RelayHighlands Ranch, CO · Ultra
Sun 8/23Rebel Run 5kDenver, CO · 5K · Other
Sun 8/2311th Annual Log Hill HustleRidgway, CO · 5K · 10K
Mon 8/24Middle School Cross Country - RMAEEvergreen, CO
Tue 8/25Mack Cross Country Team with Coach MikeBoulder, CO
Tue 8/25Eltuck Valley 12K - Lory Summer Trail SeriesBellvue, CO · Other
Wed 8/26Mineral Springs Walking Tour with A Geologist!Steamboat Springs, CO
Thu 8/27Puzzling CompetitionCommerce City, CO
Thu 8/27Aug 27 - All groups @ Red Rocks (different meeting point for Adv) - 5:30 pm start!Colorado Springs, CO
Thu 8/27Unbridled Golf ClassicCastle Rock, CO
Sat 8/29Run for Breast Cancer 5K/10K/13.1 DENVER/AURORACentennial, CO · 5K · 10K · Half Marathon · 1 Mile
Sat 8/29Sloth Run 5K/10K/13.1 DENVER/AURORACentennial, CO · 5K · 10K · Half Marathon · 1 Mile
Sat 8/29Rock HawkCastle Rock, CO · 50K · Other · 10K · 5K
Sat 8/29Continental Divide Trail RunSteamboat Springs, CO · Other · 50K
Sat 8/29Ouray 50 Mile Endurance RunOuray, CO · 50 Mile
Sat 8/29TBK Bank Thirsty 13 Half MarathonDurango, CO · Half Marathon
Sat 8/29Glow & Roll: Illuminate What's PossibleLittleton, CO · 5K · 1 Mile
Sat 8/29RexRun For PAWSitivity 2026 Trail Run/WalkAurora, CO · 5K · 1 Mile
Sat 8/29Rocky Mountain 5K presented by School District 11Colorado Springs, CO · 5K · Other
Sat 8/29Run for Hope - Colorado SpringsColorado Springs, CO · 5K · 1 Mile
Sat 8/29Historic Elizabeth Main Street 5K & Family Color RunElizabeth, CO · 5K · 1 Mile
Sat 8/29Run Like the Wind 5k / 2k / Dog JogAllenspark, CO · 5K · 1 Mile
Sat 8/29YMCA of Pueblo Indoor TriathlonPueblo, CO
Sat 8/29Aspen parkrunAspen Recreation Centre, CO · 5K
Sat 8/29South Boulder Creek parkrunSouth Boulder Creek, CO · 5K
Sun 8/30James Test SiteLyons, CO · 5K · 10K
Sun 8/30Bluffs Run 8KLone Tree, CO · Other
Sun 8/30Louisville Fall Splash & DashLouisville, CO · 1 Mile
Sun 8/30Wine Run 5k at The Winery at Holy Cross AbbeyCanon City, CO · 5K

September 2026

Thu 9/3Front Range Ultra DayzeLoveland, CO · Ultra
Thu 9/3Sept 3 - Social Ride GOG/Rampart Range Rd 5:30 pmColorado Springs, CO
Sat 9/5Denver, CO Galloway Training ProgramDenver, CO · Marathon · Half Marathon
Sat 9/5Golden Harvest Half Marathon & 5k/10k - DenverWestminster, CO · Other · 1 Mile · 5K · 10K · Half Marathon
Sat 9/5Creede Mountain RunCreede, CO · 50K · Other
Sat 9/5Raising the BarrBrighton, CO · Ultra
Sat 9/5The Beaver RunBreckenridge, CO · 5K · 10K · Other
Sat 9/5The Grand TraverseCrested Butte, CO · Ultra
Sat 9/5Break Your Neck: Walk, Run, or RollPueblo, CO · 5K · 10K
Sat 9/5Demon DashArvada, CO · 5K
Sat 9/5South Fork Alder Ass RaceSouth Fork, CO · Other · 5K
Sat 9/5Recovery Run of the Rockies 5KFort Collins, CO · 5K
Sat 9/5Cirque Series - Arapahoe Basin, COKeystone, CO · Other
Sat 9/5Aspen parkrunAspen Recreation Centre, CO · 5K
Sat 9/5South Boulder Creek parkrunSouth Boulder Creek, CO · 5K
Sun 9/6Golden Harvest Half Marathon & 5k/10k - Colorado SpringsColorado Springs, CO · Other · 1 Mile · 5K · 10K · Half Marathon
Sun 9/610k at 10,000 FeetSteamboat Springs, CO · Other
Sun 9/6Broncos 7KDenver, CO · Other
Mon 9/7Labor Day Half MarathonParker, CO · Half Marathon · 10K · 5K
Mon 9/7FCA All Abilities Labor Day 5KLoveland, CO · 5K · 1 Mile
Mon 9/7Oak Creek No Fun RunOak Creek, CO · 5K
Wed 9/9Wildland Firefighter SafetyCommerce City, CO
Thu 9/10Sept 10 - Social NIGHT Ride @ Stratton 6:30 pm *Lights Required!!Colorado Springs, CO
Fri 9/11American Heroes RunLongmont, CO · 100 Mile · Ultra
Fri 9/11Flaming Foliage Relay - Idaho Springs to Buena VistaIdaho Springs, CO · 100+ Mile
Sat 9/12National Chocolate Day: Run for Chocolates 5K/10K/13.1 DENVER/AURORACentennial, CO · 5K · 10K · Half Marathon · 1 Mile
Sat 9/12Run for Mental Health 5K/10K/13.1 DENVER/AURORACentennial, CO · 5K · 10K · Half Marathon · 1 Mile
Sat 9/12The Gunni GrinderGunnison, CO · 100+ Mile · Ultra · 50K
Sat 9/12Rampart Rager GravelColorado Springs, CO · 50K · 50 Mile · Ultra
Sat 9/12Snow Mountain RanchGranby, CO · 50K · Other · Half Marathon · 10K · 5K
Sat 9/12Devil on the DivideEmpire, CO · 50K · Half Marathon
Sat 9/12NEDNED Trail FestNederland, CO · Half Marathon · 10K · 5K
Sat 9/12Steele Trap Trail RunLoma, CO · Marathon
Sat 9/12Trail Sisters Women's Half Marathon & 10kBuena Vista, CO · Half Marathon · 10K
Sat 9/122026 Lake Nighthorse Triathlon - Sprint and OlympicDurango, CO · Other · 50K
Sat 9/12Black Squirrel Half MarathonBellvue, CO · Half Marathon
Sat 9/126 Dot DashLittleton, CO · 5K
Sat 9/12The Denver 5kDenver, CO · 5K
Sat 9/122026 RiNo 5K + Larimer MileDenver, CO · 5K · 1 Mile
Sat 9/12CASA Superhero RunGlenwood Springs, CO · 5K · 1 Mile
Sat 9/12Spirit of the Valley 5kGrand Junction, CO · 5K · Other
Sat 9/1253rd Annual Imogene Pass RunTelluride, CO · Other
Sat 9/12For The City Network 5KGreeley, CO · 5K
Sat 9/12Jungle DashLoveland, CO · 1 Mile
Sat 9/12Tater Trot 5KMonte Vista, CO · 5K
Sat 9/12The 10th Annual Run4Hope 5K for SchoolsMonument, CO · 5K
Sat 9/12Gleneagle Spirit 5K Run, Walk, and Kids Fun RunColorado Springs, CO · 5K
Sat 9/12Aspen parkrunAspen Recreation Centre, CO · 5K
Sat 9/12South Boulder Creek parkrunSouth Boulder Creek, CO · 5K
Sun 9/13Buffalo Bicycle ClassicBoulder, CO · 50K · 50 Mile · Ultra · 100 Mile · Other
Sun 9/13NUN RUNCentennial, CO · Half Marathon · 5K · 1 Mile
Sun 9/13RMRR Fall Marathon Training Series #2Thornton, CO · Half Marathon · Other
Sun 9/13RMRR September 5k/10kThornton, CO · 10K · 5K
Sun 9/139/11 Heroes Run - Denver, ColoradoDenver, CO · 5K · 1 Mile
Sun 9/1331st El Grito 5k (2026)Denver, CO · 5K
Sun 9/13Colorado Mountain Half+ Series 2026Littleton, CO · Half Marathon
Sun 9/13Tiger Prowl 5KDenver, CO · 5K
Sun 9/13Colorado Run for the Fallen Run/Walk/RuckPalmer Lake, CO
Sun 9/13FalconTriU S A F Academy, CO
Sun 9/13Honey Bee HustleLoveland, CO
Sun 9/13LEAD KING LOOP 25K, 8M, Kids RunMarble, CO · Other · 1 Mile
Sun 9/13Springs Kids TriathlonColorado Springs, CO · 1 Mile
Fri 9/18Run Rabbit RunSteamboat Springs, CO · 100 Mile
Fri 9/18Severance Glow 5K Run or WalkSeverance, CO · 5K
Sat 9/19Pikes Peak AscentManitou Springs, CO · Half Marathon
Sat 9/19Salida Bike Fest - Salida 76 and the Banana BeltSalida, CO · Ultra · 50 Mile · 50K
Sat 9/19All-Out Fall FestWestminster, CO · Half Marathon · 10K · 5K
Sat 9/19Autumn RunBuena Vista, CO · Half Marathon · 10K · 5K · Other
Sat 9/19Beulah Challenge and OverIt Series - ON PAUSE DUE TO THE ASPEN ACRES FIREBeulah, CO · Half Marathon · 10K · 5K
Sat 9/19Battle by the BrookDeckers, CO · Other · 10K
Sat 9/192026 Montbello Alive! 5KDenver, CO · 5K
Sat 9/19Break of Dawn North Table Trail RaceGolden, CO · Other
Sat 9/19Denver: Walk With Autism and Resource FairDenver, CO · 5K
Sat 9/19Marine Memorial 5KArvada, CO · 5K
Sat 9/19Miles 4 Madison 5K & 1KLittleton, CO · 5K · Other
Sat 9/19Wellington STAR Foundation 5K 10KWellington, CO · 5K · 10K
Sat 9/19Balanced Movement Yoga - Charity Fun 5K Walk/Run (Dog-Friendly)Evans, CO · 5K · 1 Mile
Sat 9/19Gummball 5KBrighton, CO · 5K
Sat 9/19Lederhosen Race 2026Red Feather Lakes, CO · 5K
Sat 9/19Ouray Mountain Trail RunOuray, CO
Sat 9/19Aspen parkrunAspen Recreation Centre, CO · 5K
Sat 9/19South Boulder Creek parkrunSouth Boulder Creek, CO · 5K
Sun 9/20Pikes Peak MarathonManitou Springs, CO · Marathon
Sun 9/2020th Annual Golden GallopGolden, CO · 5K · 10K · Half Marathon
Sun 9/20Fall EquinoxFort Collins, CO · Half Marathon · Other
Sun 9/20Expo Park XC RunsAurora, CO · 5K · 1 Mile · Other
Sun 9/20Chile & Frijole Hot to Trot 5K & 10KPueblo, CO · 5K · 10K
Sun 9/20Farmers 5000Wheat Ridge, CO · 5K
Sun 9/2018th Annual Be Ovary Aware 5k run 3k walkColorado Springs, CO · 5K · Other
Sun 9/2025th Annual Second Wind Fund Walk/RunLittleton, CO · 5K · 1 Mile
Wed 9/23CG Adventure Club - Elevation EverestWinter Park, CO · Other · Ultra
Fri 9/25Red Feather Trail JamboreeRed Feather Lakes, CO · 50 Mile · 50K · Half Marathon · 100 Mile
Fri 9/25Boggy Draw Bear ChaseDolores, CO · Other · 5K
Fri 9/25Colorado Rockies TourVarious places, CO
Fri 9/252026 Skate for ChickenColorado Springs, CO
Sat 9/26Sangre de Cristo Trail FestivalWestcliffe, CO · Other · 50K · 50 Mile · Ultra · 100 Mile
Sat 9/26Oktoberfest Run 5K/10K/13.1 DENVER/AURORACentennial, CO · 5K · 10K · Half Marathon · 1 Mile
Sat 9/26Run for Donuts 5K/10K/13.1 DENVER/AURORACentennial, CO · 5K · 10K · Half Marathon · 1 Mile
Sat 9/26Mountains to the Desert ClassicTelluride, CO · 100 Mile · Ultra
Sat 9/26Crested Butte UltraCrested Butte, CO · 50 Mile · 50K · Other
Sat 9/26WILD Wahatoya RunsLa Veta, CO · 50K · Half Marathon · Other
Sat 9/2625th Annual Black Canyon TriathlonMontrose, CO · 5K
Sat 9/26Estes EpicEstes Park, CO · 50K · Other · Ultra
Sat 9/26Deep Creek Trail Half MarathonTelluride, CO · Half Marathon
Sat 9/26West Line WinderBuena Vista, CO · 50K · Other
Sat 9/2624 Hours of Palmer LakePalmer Lake, CO · Ultra
Sat 9/26Parker Parks and Recreation So Long to Summer 5K/10KParker, CO · 5K · 10K
Sat 9/26HRCA Oktoberfest 5KLittleton, CO · 5K
Sat 9/26Lisa Nelson’s Mustang Stampede 5KArvada, CO · 5K
Sat 9/26NIGHT NATION RUN - DENVERCommerce City, CO · 5K
Sat 9/26Runway 5K - Run for the AngelsBroomfield, CO · 5K
Sat 9/26Denver Rotary Club Cycling to Serve 2026Denver, CO
Sat 9/26McGinn Memorial Cross Country ChallengePagosa Springs, CO · Other · 5K
Sat 9/26OUTLAST COLORADO SPRINGSColorado Springs, CO · Other
Sat 9/262026 Oktoberfest 5kBreckenridge, CO · 5K
Sat 9/262026 Suicide Prevention Color Walk/RunCenter, CO · 5K
Sat 9/26Mesa County Search & Rescue 5KFruita, CO · 5K
Sat 9/26Mountain Marmot Trail Run presented by Durango Running CompanyDurango, CO · Other
Sat 9/26Run For Your Flapjacks 5KOak Creek, CO · 5K
Sat 9/26Race to the Shield Homecoming RunBethoud, CO
Sat 9/26Aspen parkrunAspen Recreation Centre, CO · 5K
Sat 9/26South Boulder Creek parkrunSouth Boulder Creek, CO · 5K
Sun 9/27Running for Children's Rights to Both Parents - 9 of 50 Half Marathons in 50 States - ColoradoBoulder, CO · Half Marathon · 5K · 10K
Sun 9/27Team CKF Running SeriesAspen, CO · Marathon
Sun 9/27Colorado Coyotes Youth XC InvitationalCenennial, CO · 1 Mile · Other
Sun 9/27Sawatch AscentNathrop, CO · 50K
Sun 9/27Flyin' Lion 5KLittleton, CO · 5K
Sun 9/2714er Fest 14K & 5KBuena Vista, CO · Other · 5K
Sun 9/27Greenland Open Space Pack Burro Race presented by Double Rainbow Ranch (8 Mile and 3 Mile)Larkspur, CO · Other · 5K
Sun 9/27Joy & Justice 5kTimnath, CO · 5K · 1 Mile
Sun 9/27Grand Valley Brew RunsGrand Junction, CO · 5K
Sun 9/27Pat Mahan Memorial Foundation 5KWiggins, CO · 5K
Sun 9/27RMRR Fall Marathon Training Series #3Thornton, CO · Other
Tue 9/292026 Center of the Nation Series - Day 2 (CO)Sterling, CO

October 2026

Fri 10/2Water For People World Water ClassicAnywhere, CO · 5K · Ultra
Sat 10/3Spooky Sprint - DenverLittleton, CO · Other · 1 Mile · 5K · 10K · Half Marathon
Sat 10/3The Bear ChaseLakewood, CO · Ultra · 50 Mile · 50K
Sat 10/3Colorado Springs Marathon, Half, 5K, and Kids KColorado Springs, CO · Marathon · Half Marathon · 5K · Other
Sat 10/3Rim to Rim Royal Gorge Races: 5K Road Run, Trail 8 Mile, Trail Half MarathonCanon City, CO · 5K · Other · Half Marathon · 10K
Sat 10/3West Elk ChallengeCrawford, CO · Marathon · Other
Sat 10/3Above the Clouds UltraWoodland Park, CO · 50K · 10K
Sat 10/3HRCA Wildcat Mountain Trail RacesLittleton, CO · Other · 10K
Sat 10/3Sage Burner Trail RaceGunnison, CO · 50K · Other
Sat 10/3Grand Valley BackyardLoma, CO · Ultra
Sat 10/3Lafayette Music Fest -5K - 10KLafayette, CO · 10K · 5K
Sat 10/3PRA Miner Gold RushBroomfield, CO · 5K · 1 Mile
Sat 10/3Big Waves Family 5K run/walkWestminster, CO · 5K
Sat 10/3I Can 5kThornton, CO · 5K
Sat 10/3OUTLAST DENVERLittleton, CO · Other
Sat 10/3Emerald Mountain Trail RunSteamboat Springs, CO · Other
Sat 10/3FAMpoint5kGrand Junction, CO · Other
Sat 10/3Homecoming 5K - Colorado State UniversityFort Collins, CO · 5K
Sat 10/3Rut Run 5kEstes Park, CO · 5K
Sat 10/3Splashland TriathlonAlamosa, CO
Sat 10/3Aspen parkrunAspen Recreation Centre, CO · 5K
Sat 10/3South Boulder Creek parkrunSouth Boulder Creek, CO · 5K
Sun 10/4Windsor Marathon, Half Marathon, 10k, 5k & 1 Mile RunWindsor, CO · Marathon · Half Marathon · 10K · 5K · 1 Mile
Sun 10/4RMRR October 5k/8miAurora, CO · Other · 5K
Sun 10/4Rubey Rescue RunAspen, CO · 5K · 1 Mile
Sun 10/4Fall Series - Get Dirty! Get Muddy!Colorado Springs, CO · 5K · Other
Sun 10/4Evergreen Mountain Weeknight RaceEvergreen, CO
Sun 10/4OTILLO Swimrun ColoradoFort Collins, CO
Sun 10/4Kids' Fall Series - Where Kids Run Free!Colorado Springs, CO
Wed 10/7Your Story Isn't Over 5k/10k/Kids 1-MileLittleton, CO · 1 Mile · 10K · 5K
Sat 10/10Bagel Run 5K/10K/13.1 DENVER/AURORACentennial, CO · 5K · 10K · Half Marathon · 1 Mile
Sat 10/10Breckenridge RunFestBreckenridge, CO · Marathon · Half Marathon · 10K · 5K · 1 Mile
Sat 10/10Coffee Lovers Run 5K/10K/13.1 DENVER/AURORACentennial, CO · 5K · 10K · Half Marathon · 1 Mile
Sat 10/10The Long View MarathonFort Collins, CO · Marathon · Half Marathon · 5K
Sat 10/10Grassroots GravelPueblo, CO · 100 Mile · Ultra · Other
Sat 10/10Suffer Better 10th Annual Fall Trail RunsPine, CO · 50K · Other · 5K
Sat 10/10Kipling Villas 5K - 2026Littleton, CO · 5K
Sat 10/10Manitou 5KManitou Springs, CO · 5K
Sat 10/10Dialysis Dash 5KGrand Junction, CO · 5K
Sat 10/10Flying Falcon Downhill MileUSAF Academy, CO · 1 Mile
Sat 10/10Footsteps for Families 5k Fun Run & ConcertWindsor, CO · 5K
Sat 10/10Aspen parkrunAspen Recreation Centre, CO · 5K
Sat 10/10South Boulder Creek parkrunSouth Boulder Creek, CO · 5K
Sun 10/11Durango MarathonDurango, CO · Marathon · Half Marathon
Sun 10/11Westy Half & 5kWestminster, CO · Half Marathon · 5K
Sun 10/11EDT XC ShowdownAurora, CO · Other · 1 Mile
Sun 10/11The Moony Pride 5kFort Collins, CO · 5K
Fri 10/16Whistle Pig InvitationalCraig, CO · 5K
Sat 10/17Blue Sky Trail Marathon & Half MarathonFort Collins, CO · Marathon · Half Marathon
Sat 10/17Indian Creek Trail RunsSedalia, CO · Other · 50K · 50 Mile
Sat 10/17Bobcat Trail RacesColorado Springs, CO · 50K · Other · 10K · 5K
Sat 10/17The Great Trailhead Foot Race 5 & 10 MilerLakewood, CO · Other
Sat 10/17Living Water 5K and Family Fun RunDenver, CO · 5K
Sat 10/17The Great Pumpkin HaulFruita, CO · Other
Sat 10/17Witch PaddleLittleton, CO
Sat 10/17Aspen parkrunAspen Recreation Centre, CO · 5K
Sat 10/17South Boulder Creek parkrunSouth Boulder Creek, CO · 5K
Sun 10/18Halloween Hustle for CharityGlenwood Springs, CO · 1 Mile · 5K
Sun 10/18The Palmer Lake .5K (Yes "Point" 5)Palmer Lake, CO · 5K
Wed 10/21DU Crimson Classic 5K Run/1.5 Mile WalkDenver, CO · 5K · 1 Mile
Thu 10/22Active Adults Anderson Farms Fall ExcursionEvergreen, CO
Sat 10/24Bridge Burner UltraCanon City, CO · 50K · Other · 10K
Sat 10/24Mancos Cowboy Half Marathon, 5K, and Fun RunMancos, CO · Half Marathon · 5K · 1 Mile
Sat 10/24Apex Foundation Trick or Trot 5K & Halloween Hunt Powered by REP FitnessArvada, CO · 5K · 1 Mile
Sat 10/24Race to Cure Sarcoma DenverDenver, CO · 5K · Other
Sat 10/24YMCA Creepy Crawl 5KPalmer Lake, CO · 5K · 1 Mile
Sat 10/24YMCA of Pueblo Spooky Sprint 5KPueblo, CO · 5K
Sat 10/24Aspen parkrunAspen Recreation Centre, CO · 5K
Sat 10/24South Boulder Creek parkrunSouth Boulder Creek, CO · 5K
Sun 10/25Ghosts and Goblins 5K/10KDenver, CO · 5K · 10K
Sun 10/25The 14th Annual Odyssey Odyssey - 2026Denver, CO · 5K · 1 Mile
Sun 10/25Beware the Bear Trail RacesLakewood, CO · Other · 5K
Sat 10/31Halloween Trick or Trot Run 5K/10K/13.1 DENVER/AURORACentennial, CO · 5K · 10K · Half Marathon · 1 Mile
Sat 10/31PB&J Fuel Run 5K/10K/13.1 DENVER/AURORACentennial, CO · 5K · 10K · Half Marathon · 1 Mile
Sat 10/31Spooky Sprint - Colorado SpringsColorado Springs, CO · 1 Mile · 5K · 10K · Half Marathon
Sat 10/31I Ain't Scared (of 5k)Thornton, CO · 5K
Sat 10/312026 Eerie ErieErie, CO
Sat 10/31EAPL Zombie Run 5KEvergreen, CO · 5K
Sat 10/31Foundry Halloween 5kSteamboat Springs, CO · 5K
Sat 10/31Panda Waddle 5kGrand Junction, CO · 5K
Sat 10/31Halloween Fun Run 5k & 1mile - Zombie ThemeIdaho Springs, CO · 5K · 1 Mile
Sat 10/31Aspen parkrunAspen Recreation Centre, CO · 5K
Sat 10/31South Boulder Creek parkrunSouth Boulder Creek, CO · 5K

November 2026

Sun 11/1All-Out Kooky-SpookyGolden, CO · Half Marathon · 10K · 5K
Sun 11/1Feet for Justice RunDenver, CO · 10K · 5K
Sun 11/1RMRR November 5k/15kDenver, CO · Other · 5K
Sun 11/1Girls on the Run Northern Colorado Fall 5KFort Collins, CO · 5K
Sat 11/7Turkey Trails- DenverLittleton, CO · Other · 1 Mile · 5K · 10K · Half Marathon
Sat 11/7Kessel Run UltraFruita, CO · 50 Mile · Ultra · 50K · Other
Sat 11/7City Park Classic (5k/10k & 1 Mile Walk of Hope for Pancreatic Cancer Research)Denver, CO · 5K · 10K · 1 Mile
Sat 11/7HRCA Backcountry Wilderness Half MarathonLone Tree, CO · Half Marathon
Sat 11/7Colorado 24 Hour RunFort Collins, CO · Ultra
Sat 11/7Alamosa Veterans Memorial Park RaceAlamosa, CO · 5K · 10K
Sat 11/7Bell Ringer 2 MilerLoveland, CO · Other
Sat 11/7Aspen parkrunAspen Recreation Centre, CO · 5K
Sat 11/7South Boulder Creek parkrunSouth Boulder Creek, CO · 5K
Sun 11/8Turkey Trails - Colorado SpringsColorado Springs, CO · Other · 1 Mile · 5K · 10K · Half Marathon
Sun 11/8Canya Cañon Trail Race & HikeColorado Springs, CO · Other
Sun 11/8Colorado Springs Veterans Day 5kColorado Springs, CO · 5K
Mon 11/92026 Southwest Series - Day 2 (CO)Durango, CO
Thu 11/12Veteran's Day EventAurora, CO
Sat 11/14Run for Mental Health 5K/10K/13.1 DENVER/AURORACentennial, CO · 5K · 10K · Half Marathon · 1 Mile
Sat 11/14Veterans Day Freedom Run 5K/10K/13.1 DENVER/AURORACentennial, CO · 5K · 10K · Half Marathon · 1 Mile
Sat 11/14Louisville Trail RaceLouisville, CO · Half Marathon · 10K · 5K
Sat 11/14Denver Veterans Day RunDenver, CO · 5K · 10K
Sat 11/14Colorado State Youth Cross Country ChampionshipsAurora, CO · 1 Mile · Other
Sat 11/14Aspen parkrunAspen Recreation Centre, CO · 5K
Sat 11/14South Boulder Creek parkrunSouth Boulder Creek, CO · 5K
Sun 11/15Giants of the Plains Nature WalkCommerce City, CO
Thu 11/19FriendsgivingCommerce City, CO
Sat 11/21Colorado Cold Rush UltraColorado Springs, CO · 50K · Half Marathon · 10K
Sat 11/21TURKEY TREK (13.1, 10k, 5k & 2k)Arvada, CO · Half Marathon · 10K · 5K · 1 Mile
Sat 11/21Pumpkin Pie 5K/10KDenver, CO · 5K · 10K
Sat 11/21Feed Your Soul Turkey Trot 5KWheat Ridge, CO · 5K
Sat 11/21Aspen parkrunAspen Recreation Centre, CO · 5K
Sat 11/21South Boulder Creek parkrunSouth Boulder Creek, CO · 5K
Thu 11/26Broomfield Turkey Day 5K/10KBroomfield, CO · 10K · 5K · Other
Thu 11/26Mile High United Way Turkey Trot 2026Denver, CO · Other · 1 Mile
Thu 11/26WP Elite Turkey Trot and RuckWoodland Park, CO · 10K · 5K
Thu 11/26Alpine Bank Boulder Thanksgiving Day 5KBoulder, CO · 5K · Other
Thu 11/26Gobble Wobble Run 2026Littleton, CO · 5K
Thu 11/26YMCA Turkey Trot 5KColorado Springs, CO · 5K · Other
Thu 11/26AdventHealth Avista Louisville Turkey TrotLouisville, CO · 5K
Thu 11/26NCMC Turkey TrotGreeley, CO · 5K · 1 Mile
Thu 11/26The Pilgrimage Run 2026Erie, CO · Other
Thu 11/262026 Loveland Turkey TrotLoveland, CO · 5K
Thu 11/26Pelican Lakes Turkey TrotWindsor, CO · 5K
Thu 11/26YMCA of Pueblo Turkey TrotPueblo, CO · 5K
Thu 11/26Buena Vista Turkey Trot 5K & Family Fun RunBuena Vista, CO · 1 Mile · 5K
Thu 11/26Parker Parks and Recreation Turkey Day 5K FUN Run/WalkParker, CO · 5K
Thu 11/26Huffin' for Stuffin' 2-Mile Fun RunLoveland, CO · Other
Fri 11/27Christmas Mountain 5 Mile RunSalida, CO · Other · 1 Mile
Sat 11/28Coffee Lovers Run 5K/10K/13.1 DENVER/AURORACentennial, CO · 5K · 10K · Half Marathon · 1 Mile
Sat 11/28Thanksgiving Gobble Trot Run 5K/10K/13.1 DENVER/AURORACentennial, CO · 5K · 10K · Half Marathon · 1 Mile
Sat 11/28Aspen parkrunAspen Recreation Centre, CO · 5K
Sat 11/28South Boulder Creek parkrunSouth Boulder Creek, CO · 5K

December 2026

Sat 12/5All-Out Fa La LaWestminster, CO · Half Marathon · 10K · 5K
Sat 12/5Candy Cane Course - Colorado SpringsColorado Springs, CO · Other · 1 Mile · 5K · 10K
Sat 12/5Chasing Santa 5k/Cycling Santa Toy Drive Presented by: Springs Law GroupColorado Springs, CO · 5K · 10K · Other
Sat 12/5Sawmill Trail RunsPine, CO · Other · 50K
Sat 12/5Thumbs Up Vertical ChallengeEstes Park, CO · Ultra
Sat 12/5Toy DropLoveland, CO · 5K · 10K · Other
Sat 12/5Onesie DashRed Feather Lakes, CO · 1 Mile
Sat 12/5Run with the Buffalo Fun Run: 2.5 Mile DistanceCommerce City, CO · Other
Sat 12/5Run with the Buffalo Fun Run: 5K DistanceCommerce City, CO · 5K
Sat 12/52026 Moose MarchBreckenridge, CO
Sat 12/52026 Race of the SantasBreckenridge, CO
Sat 12/5Aspen parkrunAspen Recreation Centre, CO · 5K
Sat 12/5South Boulder Creek parkrunSouth Boulder Creek, CO · 5K
Sun 12/6Candy Cane Course - DenverWestminster, CO · 1 Mile · 5K · 10K · Other
Sun 12/6Rock Canyon Half Marathon- 40th Anniversary Run!Pueblo, CO · Half Marathon · 5K
Sun 12/6RMRR December 4.5miDenver, CO · Other
Sat 12/12Run for Breast Cancer 5K/10K/13.1 DENVER/AURORACentennial, CO · 5K · 10K · Half Marathon · 1 Mile
Sat 12/12Sunrise Marathon 5K/10K/13.1 DENVER/AURORACentennial, CO · 5K · 10K · Half Marathon · 1 Mile
Sat 12/12Santa Catch 5k & 10kWindsor, CO · 5K · 10K · 1 Mile
Sat 12/12YMCA Jingle Jog 5KFountain, CO · 5K · 1 Mile
Sat 12/12WinterFest 5k & Fun RunThornton, CO · 5K · Other
Sat 12/12Aspen parkrunAspen Recreation Centre, CO · 5K
Sat 12/12South Boulder Creek parkrunSouth Boulder Creek, CO · 5K
Sun 12/132026 Jingle Bell Run - ColoradoDenver, CO · 5K · 1 Mile · Other
Sat 12/19Santa's Dash for Ca$hDenver, CO · 5K
Sat 12/19Aspen parkrunAspen Recreation Centre, CO · 5K
Sat 12/19South Boulder Creek parkrunSouth Boulder Creek, CO · 5K
Sun 12/20Ugly Sweater 5KDenver, CO · 5K
Sat 12/26A Merry Christmas Run 5K/10K/13.1 DENVER/AURORACentennial, CO · 5K · 10K · Half Marathon · 1 Mile
Sat 12/26New Year's Run 5K/10K/13.1 DENVER/AURORACentennial, CO · 5K · 10K · Half Marathon · 1 Mile
Sat 12/26Aspen parkrunAspen Recreation Centre, CO · 5K
Sat 12/26South Boulder Creek parkrunSouth Boulder Creek, CO · 5K
Thu 12/31Sky Pilots Club MembershipOuray, CO · Ultra
Thu 12/31James Pre-Paid Teams TestLyons, CO · Other
Thu 12/31Resolution Run - Fort CollinsFort Collins, CO · 5K
Thu 12/31run.Windsor Gift CardsWindsor, CO
Thu 12/31Hands & Voices New Year Virtual 5K: Trails to the SummitBoulder, CO · 5K

January 2027

Fri 1/1Resolute Runner 5kArvada, CO · 5K
Sat 1/2YMCA of Pueblo Hot Chocolate 5KPueblo, CO · 5K
Sat 1/2Aspen parkrunAspen Recreation Centre, CO · 5K
Sat 1/2South Boulder Creek parkrunSouth Boulder Creek, CO · 5K
Sat 1/9All-Out Polar ProwlArvada, CO · Half Marathon · 10K · 5K
Sat 1/9Aspen parkrunAspen Recreation Centre, CO · 5K
Sat 1/9South Boulder Creek parkrunSouth Boulder Creek, CO · 5K
Sat 1/16MLK Jr. Freedom Run 5K/10K/13.1 DENVER/AURORACentennial, CO · 5K · 10K · Half Marathon · 1 Mile
Sat 1/16Sunrise Marathon 5K/10K/13.1 DENVER/AURORACentennial, CO · 5K · 10K · Half Marathon · 1 Mile
Sat 1/16ALMAGEDDON Winter Triathlon presented by the Alma FoundationAlma, CO · Half Marathon
Sat 1/16Aspen parkrunAspen Recreation Centre, CO · 5K
Sat 1/16South Boulder Creek parkrunSouth Boulder Creek, CO · 5K
Sat 1/23Aspen parkrunAspen Recreation Centre, CO · 5K
Sat 1/23South Boulder Creek parkrunSouth Boulder Creek, CO · 5K
Sat 1/30Coffee Lover Run DENVER/AURORACentennial, CO · 5K · 10K · Half Marathon · 1 Mile
Sat 1/30Run for Donut DENVER/AURORACentennial, CO · 5K · 10K · Half Marathon · 1 Mile
Sat 1/30Aspen parkrunAspen Recreation Centre, CO · 5K
Sat 1/30South Boulder Creek parkrunSouth Boulder Creek, CO · 5K

February 2027

Sat 2/6All-Out Mardi CrawlArvada, CO · Half Marathon · 10K · 5K
Sat 2/6Stories Trail RunsColorado Springs, CO · 10K · Half Marathon · Other
Sat 2/6Aspen parkrunAspen Recreation Centre, CO · 5K
Sat 2/6South Boulder Creek parkrunSouth Boulder Creek, CO · 5K
Sat 2/13Run for Chocolate 5K/10K/13.1 DENVER/AURORACentennial, CO · 5K · 10K · Half Marathon · 1 Mile
Sat 2/13Valentine's Day Run 5K/10K/13.1 DENVER/AURORACentennial, CO · 5K · 10K · Half Marathon · 1 Mile
Sat 2/13Heart Throb 5kArvada, CO · 5K
Sat 2/13Aspen parkrunAspen Recreation Centre, CO · 5K
Sat 2/13South Boulder Creek parkrunSouth Boulder Creek, CO · 5K
Sun 2/14The Toyota Super Half Marathon™& Game Day 5K™Colorado Springs, CO · Half Marathon · 5K
Sat 2/20Aspen parkrunAspen Recreation Centre, CO · 5K
Sat 2/20South Boulder Creek parkrunSouth Boulder Creek, CO · 5K
Sat 2/27Aspen parkrunAspen Recreation Centre, CO · 5K
Sat 2/27South Boulder Creek parkrunSouth Boulder Creek, CO · 5K
Sun 2/28Highlands Ranch 5kHighlands Ranch, CO · 5K

March 2027

Sat 3/6Aspen parkrunAspen Recreation Centre, CO · 5K
Sat 3/6South Boulder Creek parkrunSouth Boulder Creek, CO · 5K
Sat 3/1322nd Annual Run Through Time Trail Marathon and Half MarathonSalida, CO · Marathon · Half Marathon · Other
Sat 3/13Erin Go Bragh 7.77kWestminster, CO · Other
Sat 3/13Aspen parkrunAspen Recreation Centre, CO · 5K
Sat 3/13South Boulder Creek parkrunSouth Boulder Creek, CO · 5K
Sun 3/14Lucky Brew Race 5K, 10K, 15k & Half MarathonSeverance, CO · 5K · 10K · Other · Half Marathon
Sat 3/20Aspen parkrunAspen Recreation Centre, CO · 5K
Sat 3/20South Boulder Creek parkrunSouth Boulder Creek, CO · 5K
Sun 3/21All-Out Spring FeverGolden, CO · Half Marathon · 10K · 5K
Sat 3/27Aspen parkrunAspen Recreation Centre, CO · 5K
Sat 3/27South Boulder Creek parkrunSouth Boulder Creek, CO · 5K
Sun 3/28Central Park 5kDenver, CO · 5K

April 2027

Sat 4/3Aspen parkrunAspen Recreation Centre, CO · 5K
Sat 4/3South Boulder Creek parkrunSouth Boulder Creek, CO · 5K
Sun 4/4Donut DashDenver, CO · 5K
Sat 4/10Aspen parkrunAspen Recreation Centre, CO · 5K
Sat 4/10South Boulder Creek parkrunSouth Boulder Creek, CO · 5K
Sun 4/11NoCo Urban Ultra & RelayBellvue, CO · 50 Mile · 100 Mile
Sun 4/11Platte River Half-Marathon, Relay & 5kLittleton, CO · Half Marathon · 5K
Sat 4/17Rattler Trail RaceColorado Springs, CO · 50K · Other · 10K · 5K
Sat 4/17Aspen parkrunAspen Recreation Centre, CO · 5K
Sat 4/17South Boulder Creek parkrunSouth Boulder Creek, CO · 5K
Sun 4/18Horsetooth Half Marathon - Presented by Fort Collins ConnexionFort Collins, CO · Half Marathon
Sun 4/182027 Elevate Kids Fun RunGrand Junction, CO · 10K · 5K · 1 Mile
Sat 4/24All-Out Beat the HeatWestminster, CO · Half Marathon · 10K · 5K
Sat 4/24Bigfoot Half MarathonEstes Park, CO · Half Marathon · 5K
Sat 4/24Cheyenne Mountain Trail RaceColorado Springs, CO · 50K · Other
Sat 4/24Aspen parkrunAspen Recreation Centre, CO · 5K
Sat 4/24South Boulder Creek parkrunSouth Boulder Creek, CO · 5K
Sun 4/25Unicorn 5k (Denver-East)Denver, CO · 5K

May 2027

Sat 5/1Greenland Trail RacesLarkspur, CO · 50K · Other
Sat 5/1Take 5 in the GardenColorado Springs, CO · Other · 5K
Sat 5/118 Hours of FruitaLoma, CO · Other
Sat 5/1Aspen parkrunAspen Recreation Centre, CO · 5K
Sat 5/1South Boulder Creek parkrunSouth Boulder Creek, CO · 5K
Sun 5/2The Colorado MarathonFort Collins, CO · Marathon · Half Marathon · 10K · 5K
Sun 5/2The PilgrimageMack, CO · Ultra
Sun 5/2Emerge 5KBoulder, CO · 5K
Sat 5/8Valkyrie Trail RaceColorado Springs, CO · 50K · Marathon · Other · Half Marathon
Sat 5/8Colterris Wine Run 5kPalisade, CO · 5K
Sat 5/8Aspen parkrunAspen Recreation Centre, CO · 5K
Sat 5/8South Boulder Creek parkrunSouth Boulder Creek, CO · 5K
Sun 5/9Colorado Women's Classic - WestminsterWestminster, CO · 5K · 10K · Other
Sun 5/9Denver Mother's Day 5KDenver, CO · 5K
Sat 5/15Endure Trail RunsDivide, CO · Other · Marathon
Sat 5/15Aspen parkrunAspen Recreation Centre, CO · 5K
Sat 5/15South Boulder Creek parkrunSouth Boulder Creek, CO · 5K
Sat 5/22Aspen parkrunAspen Recreation Centre, CO · 5K
Sat 5/22South Boulder Creek parkrunSouth Boulder Creek, CO · 5K
Sat 5/29Aspen parkrunAspen Recreation Centre, CO · 5K
Sat 5/29South Boulder Creek parkrunSouth Boulder Creek, CO · 5K

June 2027

Sat 6/5Weld Your Mettle Running FestivalEaton, CO · 50 Mile · Ultra · Other · Marathon · 50K · 100+ Mile
Sat 6/5Aspen parkrunAspen Recreation Centre, CO · 5K
Sat 6/5South Boulder Creek parkrunSouth Boulder Creek, CO · 5K
Sun 6/6Colorado 13er (Half Marathon/10k/5k)Louisville, CO · Half Marathon · 10K · 5K
Sun 6/6Flamingo Day 5KDenver, CO · 5K
Sat 6/12KowTown GravelKremmling, CO · Ultra · 50 Mile · 50K · Other
Sat 6/12All-Out Summer BreezeArvada, CO · Half Marathon · 10K · 5K
Sat 6/12Summits Trail RunsGranby, CO · 10K · Other · 50K
Sat 6/12Aspen parkrunAspen Recreation Centre, CO · 5K
Sat 6/12South Boulder Creek parkrunSouth Boulder Creek, CO · 5K
Sat 6/19Unicorn 5k (North)Thornton, CO · 5K · Other
Sat 6/19Aspen parkrunAspen Recreation Centre, CO · 5K
Sat 6/19South Boulder Creek parkrunSouth Boulder Creek, CO · 5K
Thu 6/24Race in the Clouds - Alma Dirt Festival 2027Alma, CO · Ultra · Marathon · Half Marathon · Other · 10K
Sat 6/26Aspen parkrunAspen Recreation Centre, CO · 5K
Sat 6/26South Boulder Creek parkrunSouth Boulder Creek, CO · 5K

July 2027

Sat 7/3Red, White, and WARRIOR 5KGrand Junction, CO · 5K · Other
Sat 7/3Aspen parkrunAspen Recreation Centre, CO · 5K
Sat 7/3South Boulder Creek parkrunSouth Boulder Creek, CO · 5K
Sat 7/10Aspen parkrunAspen Recreation Centre, CO · 5K
Sat 7/10South Boulder Creek parkrunSouth Boulder Creek, CO · 5K
Sat 7/17Summer Splash Prairie Dog Half, 10k, & 5kCastle Rock, CO · Half Marathon · 10K · 5K
Sat 7/17Aspen parkrunAspen Recreation Centre, CO · 5K
Sat 7/17South Boulder Creek parkrunSouth Boulder Creek, CO · 5K

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