Colorado Half Marathons
111 upcoming half marathons across Colorado, updated nightly. Want radius search and maps? Open these in the Race Finder.
July 2026
- 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
August 2026
- Sat 8/1Aspen BackcountryAspen, CO · 50K · Marathon · Half Marathon
- Sat 8/1Winter Park 50KWinter Park, CO · 50K · Half Marathon · 10K
- Sat 8/1Popsicle 5K/10K/Half - Colorado SpringsColorado Springs, CO · 5K · 10K · Half Marathon
- Sat 8/1Popsicle 5K/10K/Half Marathon -Colorado SpringsColorado Springs, CO · Half Marathon
- Sun 8/2Bound for Boston Marathon & Half Marathon - DenverDenver, CO · Marathon · Half Marathon
- Fri 8/7Choice City Running FestivalFort Collins, CO · 1 Mile · Half Marathon · 10K · 5K
- Sat 8/8All-Out RunapaloozaArvada, CO · Half Marathon · 10K · 5K
- Sat 8/8Georgetown to Idaho Springs Half Marathon 2026Idaho Springs, CO · Half Marathon
- 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 8/152026 Mt. Sneffels Half Marathon-10K-Kids-Fun RunRidgway, CO · Half Marathon · 10K · 1 Mile
- Sun 8/16Erie Half & 5kErie, CO · Half Marathon · 5K
- 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 8/22Bergen Peak Half Marathon Trail Race - 8/22/26Evergreen, CO · Half Marathon
- Sun 8/23Pioneer Prairie Dog Half, 10k & 5kWestminster, CO · Half Marathon · 10K · 5K
- 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 8/29TBK Bank Thirsty 13 Half MarathonDurango, CO · Half Marathon
September 2026
- 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
- Sun 9/6Golden Harvest Half Marathon & 5k/10k - Colorado SpringsColorado Springs, CO · Other · 1 Mile · 5K · 10K · Half Marathon
- Mon 9/7Labor Day Half MarathonParker, CO · Half Marathon · 10K · 5K
- 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 9/12Snow 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 9/12Trail Sisters Women's Half Marathon & 10kBuena Vista, CO · Half Marathon · 10K
- Sat 9/12Black Squirrel Half MarathonBellvue, CO · Half Marathon
- Sun 9/13NUN RUNCentennial, CO · Half Marathon · 5K · 1 Mile
- Sun 9/13RMRR Fall Marathon Training Series #2Thornton, CO · Half Marathon · Other
- Sun 9/13Colorado Mountain Half+ Series 2026Littleton, CO · Half Marathon
- Sat 9/19Pikes Peak AscentManitou Springs, CO · Half Marathon
- 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
- Sun 9/2020th Annual Golden GallopGolden, CO · 5K · 10K · Half Marathon
- Sun 9/20Fall EquinoxFort Collins, CO · Half Marathon · Other
- Fri 9/25Red Feather Trail JamboreeRed Feather Lakes, CO · 50 Mile · 50K · Half Marathon · 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 9/26WILD Wahatoya RunsLa Veta, CO · 50K · Half Marathon · Other
- Sat 9/26Deep Creek Trail Half MarathonTelluride, CO · Half Marathon
- Sun 9/27Running for Children's Rights to Both Parents - 9 of 50 Half Marathons in 50 States - ColoradoBoulder, CO · Half Marathon · 5K · 10K
October 2026
- Sat 10/3Spooky Sprint - DenverLittleton, CO · Other · 1 Mile · 5K · 10K · Half Marathon
- 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
- Sun 10/4Windsor Marathon, Half Marathon, 10k, 5k & 1 Mile RunWindsor, CO · Marathon · Half Marathon · 10K · 5K · 1 Mile
- 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
- Sun 10/11Durango MarathonDurango, CO · Marathon · Half Marathon
- Sun 10/11Westy Half & 5kWestminster, CO · Half Marathon · 5K
- Sat 10/17Blue Sky Trail Marathon & Half MarathonFort Collins, CO · Marathon · Half Marathon
- Sat 10/24Mancos Cowboy Half Marathon, 5K, and Fun RunMancos, CO · Half Marathon · 5K · 1 Mile
- 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
November 2026
- Sun 11/1All-Out Kooky-SpookyGolden, CO · Half Marathon · 10K · 5K
- Sat 11/7Turkey Trails- DenverLittleton, CO · Other · 1 Mile · 5K · 10K · Half Marathon
- Sat 11/7HRCA Backcountry Wilderness Half MarathonLone Tree, CO · Half Marathon
- Sun 11/8Turkey Trails - Colorado SpringsColorado Springs, CO · Other · 1 Mile · 5K · 10K · Half Marathon
- 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 11/21Colorado 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 11/28Coffee 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
December 2026
- Sat 12/5All-Out Fa La LaWestminster, CO · Half Marathon · 10K · 5K
- Sun 12/6Rock Canyon Half Marathon- 40th Anniversary Run!Pueblo, CO · Half Marathon · 5K
- 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 12/26A 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
January 2027
- Sat 1/9All-Out Polar ProwlArvada, CO · Half Marathon · 10K · 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 1/30Alley LoopCrested Butte, CO · Marathon · Half Marathon · 10K · 5K · Other
- 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
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 2/13Run 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
- Sun 2/14The Toyota Super Half Marathon™& Game Day 5K™Colorado Springs, CO · Half Marathon · 5K
March 2027
- Sat 3/1322nd Annual Run Through Time Trail Marathon and Half MarathonSalida, CO · Marathon · Half Marathon · Other
- Sun 3/14Lucky Brew Race 5K, 10K, 15k & Half MarathonSeverance, CO · 5K · 10K · Other · Half Marathon
- Sat 3/20Sunrise Marathon 5K/10K/13.1 DENVER/AURORACentennial, CO · 5K · 10K · Half Marathon · 1 Mile
- Sun 3/21All-Out Spring FeverGolden, CO · Half Marathon · 10K · 5K
April 2027
- Sat 4/10Run for Bagels 5K/10K/13.1 DENVER/AURORACentennial, CO · 5K · 10K · Half Marathon · 1 Mile
- Sun 4/11Platte River Half-Marathon, Relay & 5kLittleton, CO · Half Marathon · 5K
- Sun 4/18Horsetooth Half Marathon - Presented by Fort Collins ConnexionFort Collins, CO · Half Marathon
- Sat 4/24Coffee Lover Run DENVER/AURORACentennial, CO · 5K · 10K · Half Marathon · 1 Mile
- Sat 4/24All-Out Beat the HeatWestminster, CO · Half Marathon · 10K · 5K
- Sat 4/24Bigfoot Half MarathonEstes Park, CO · Half Marathon · 5K
May 2027
- Sun 5/2The Colorado MarathonFort Collins, CO · Marathon · Half Marathon · 10K · 5K
- Sat 5/8Valkyrie Trail RaceColorado Springs, CO · 50K · Marathon · Other · Half Marathon
June 2027
- Sun 6/6Colorado 13er (Half Marathon/10k/5k)Louisville, CO · Half Marathon · 10K · 5K
- Sat 6/12All-Out Summer BreezeArvada, CO · Half Marathon · 10K · 5K
- Thu 6/24Race in the Clouds - Alma Dirt Festival 2027Alma, CO · Ultra · Marathon · Half Marathon · Other · 10K
July 2027
- Sat 7/10All-Out Dog DaysWestminster, CO · Half Marathon · 10K · 5K
- Sat 7/17Summer Splash Prairie Dog Half, 10k, & 5kCastle Rock, CO · Half Marathon · 10K · 5K
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