Colorado
Colorado Obstacle Race Calendar 2026-2027
Monthly updates for Colorado
Get new running races (and updates) in your inbox every month.
Explore the best obstacle runs in Colorado for 2026-2027! Our updated list features 6 exciting races across the region. Find your next race in Colorado below and join the running community at these great events!
February 2026
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.
May 2026
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.
Challenge your fitness at the 2026 Denver DEKA FIT & Ultra on May 30 at Gaylord Rockies in Aurora, CO. Tackle a 5 km course with 10 fitness zones, or step up to the Ultra, with volunteer perks and service member discounts available.
June 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.
July 2026
A functional fitness event in Frederick, CO offering two formats: Cerox with running and Cerox Iron without running. Individuals and teams of two complete eight station-based fitness zones with specified reps and equipment.
September 2026
Tough Mudder Colorado takes place at Fort Carson on September 26 2026 with 15K and 5K obstacle courses, finisher medals and gear, spectator village with entertainment and food, plus volunteer and group packages.