Endurance Races in Colorado, United States 2026 140 events
Browse upcoming endurance races in United States. Find dates, distances, and registration links.
Upcoming races
RunningIn 7 weeks
Blue Sky Trail Marathon & Half Marathon
◎ Fort Collins, USA▤ Oct 17-18, 2026
42.2 km
RunningIn 8 weeks
Apex Foundation Trick or Trot 5K & Halloween Hunt
◎ Arvada, USA▤ Oct 24, 2026
5 km
RunningIn 8 weeks
Bridge Burner Ultra
◎ Canon City, USA▤ Oct 24, 2026
RunningIn 8 weeks
Beware the Bear Trail Races
◎ Lakewood, USA▤ Oct 25, 2026
RunningIn 9 weeks
Halloween Trick or Trot Run 5K/10K/13.1 DENVER/AURORA
◎ Aurora, USA▤ Oct 31, 2026
5 km
RunningIn 9 weeks
PB&J Fuel Run 5K/10K/13.1 DENVER/AURORA
◎ Aurora, USA▤ Oct 31, 2026
5 km
RunningIn 9 weeks
All-Out Kooky-Spooky
◎ Golden, USA▤ Nov 1, 2026
RunningIn 2 months
Marathon At The MAC
◎ Castle Rock, USA▤ Nov 7, 2026
42.2 km
RunningIn 2 months
Kessel Run Ultra
◎ Fruita, USA▤ Nov 7, 2026
RunningIn 2 months
Alamosa Veterans Memorial Park Race
◎ Alamosa, USA▤ Nov 7, 2026
RunningIn 2 months
Bell Ringer 2 Miler
◎ Loveland, USA▤ Nov 7, 2026
RunningIn 2 months
City Park Classic (5k/10k & 1 Mile Walk of Hope for Pancreatic Cancer Research)
◎ Denver, USA▤ Nov 7, 2026
5 km
RunningIn 2 months
Colorado 24 Hour Run
◎ Fort Collins, USA▤ Nov 7-8, 2026
RunningIn 2 months
Colorado Springs Veterans Day 5k
◎ Colorado Springs, USA▤ Nov 8, 2026
5 km
RunningIn 2 months
Canya Cañon Trail Race & Hike
◎ Colorado Springs, USA▤ Nov 8, 2026
RunningIn 3 months
Louisville Trail Race
◎ Louisville, USA▤ Nov 14, 2026
RunningIn 3 months
Colorado State Youth Cross Country Championships
◎ Aurora, USA▤ Nov 14, 2026
RunningIn 3 months
Denver Veterans Day Run
◎ Denver, USA▤ Nov 14, 2026
RunningIn 3 months
Run for Mental Health 5K/10K/13.1 DENVER/AURORA
◎ Aurora, USA▤ Nov 14, 2026
5 km
RunningIn 3 months
Colorado Cold Rush Ultra
◎ Colorado Springs, USA▤ Nov 21, 2026