Colorado Obstacle Race Calendar 2026-2027

CEROX + IRON is a functional fitness event in Frederick, Colorado. Athletes tackle eight challenging exercise zones, choosing between a format with running segments or one without. Participation is open for individuals or teams of two.

The Colorado Springs Spartan Trifecta Weekend offers obstacle course racing at the Fort Carson Army base. With courses ranging from a 5K Sprint to a 50K Ultra, runners face steep climbs, rugged trails, and various obstacles at high altitude.

Test your fitness in Denver with the DEKA FIT & Ultra. This hybrid race at the Gaylord Rockies features 10 zones over a 5 km course, plus individual, team, and weighted Ruck challenges. It takes place on May 30, 2026.

A few miles of muddy obstacles at Colorado National Speedway on June 20, 2026, featuring about a dozen Muddy Moments, waist-deep mud pits and a post race festival. Registration offers Value and VIP packages with different included items.

Choose your challenge at the CEROX + IRON fitness event. Test your endurance and strength across eight functional fitness zones, with the option of the classic Cerox (with running) or the Cerox Iron (without running). Participate as an individual or..

Tough Mudder Colorado returns to Fort Carson on September 26, 2026. Choose the 15K or 5K course packed with signature obstacles like Electroshock Therapy. Finishers earn medals, shirts, and a celebratory drink.