Find Endurance Races in Colorado

Endurance Racing in Colorado

Colorado's high-altitude terrain produces some of the most challenging and scenic endurance events in the country. Leadville is the epicenter, hosting both the Trail 100 Run and the Trail 100 MTB — "The Race Across the Sky" at over 10,000 feet. Boulder and Colorado Springs are hubs for elite runners, triathletes, and cyclists who train at altitude year-round. The state's gravel racing scene is anchored by SBT GRVL in Steamboat Springs and growing events across the Front Range. The BOLDERBoulder 10K draws 45,000+ runners every Memorial Day. Trail running explodes in summer across Rocky Mountain National Park and the San Juan Mountains, while Denver's road racing calendar fills spring and fall with fast, flat courses.