Colorado Ultramarathons
32 upcoming ultras across Colorado, updated nightly. Want radius search and maps? Open these in the Race Finder.
July 2026
- Fri 7/24Never Summer 100km & 60kmWalden, CO · Ultra · 100 Mile
- Sun 7/26Bird to Bird – Gravel Bike RideCrested Butte, CO · Ultra
- Mon 7/27The Summit 200Frisco, CO · Ultra
August 2026
- Sat 8/15MOCO Trails Wild West Backyard UltraCraig, CO · Ultra
- Wed 8/19La Garita 200South Fork, CO · Ultra
- Sat 8/22Telluride Mountain RunTelluride, CO · Other · Ultra
- Sun 8/23Rumble at the Ranch - 6 Hour MTB RelayHighlands Ranch, CO · Ultra
September 2026
- Thu 9/3Front Range Ultra DayzeLoveland, CO · Ultra
- Sat 9/5Raising the BarrBrighton, CO · Ultra
- Sat 9/5The Grand TraverseCrested Butte, CO · Ultra
- Fri 9/11American Heroes RunLongmont, CO · 100 Mile · Ultra
- Sat 9/12The Gunni GrinderGunnison, CO · 100+ Mile · Ultra · 50K
- Sat 9/12Rampart Rager GravelColorado Springs, CO · 50K · 50 Mile · Ultra
- Sun 9/13Buffalo Bicycle ClassicBoulder, CO · 50K · 50 Mile · Ultra · 100 Mile · Other
- Sat 9/19Salida Bike Fest - Salida 76 and the Banana BeltSalida, CO · Ultra · 50 Mile · 50K
- Wed 9/23CG Adventure Club - Elevation EverestWinter Park, CO · Other · Ultra
- Sat 9/26Sangre de Cristo Trail FestivalWestcliffe, CO · Other · 50K · 50 Mile · Ultra · 100 Mile
- Sat 9/26Mountains to the Desert ClassicTelluride, CO · 100 Mile · Ultra
- Sat 9/26Estes EpicEstes Park, CO · 50K · Other · Ultra
- Sat 9/2624 Hours of Palmer LakePalmer Lake, CO · Ultra
October 2026
- Fri 10/2Water For People World Water ClassicAnywhere, CO · 5K · Ultra
- Sat 10/3The Bear ChaseLakewood, CO · Ultra · 50 Mile · 50K
- Sat 10/3Grand Valley BackyardLoma, CO · Ultra
- Sat 10/10Grassroots GravelPueblo, CO · 100 Mile · Ultra · Other
November 2026
- Sat 11/7Kessel Run UltraFruita, CO · 50 Mile · Ultra · 50K · Other
- Sat 11/7Colorado 24 Hour RunFort Collins, CO · Ultra
December 2026
- Sat 12/5Thumbs Up Vertical ChallengeEstes Park, CO · Ultra
- Thu 12/31Sky Pilots Club MembershipOuray, CO · Ultra
May 2027
- Sun 5/2The PilgrimageMack, CO · Ultra
June 2027
- Sat 6/5Weld Your Mettle Running FestivalEaton, CO · 50 Mile · Ultra · Other · Marathon · 50K · 100+ Mile
- Sat 6/12KowTown GravelKremmling, CO · Ultra · 50 Mile · 50K · Other
- Thu 6/24Race in the Clouds - Alma Dirt Festival 2027Alma, CO · Ultra · Marathon · Half Marathon · Other · 10K
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