Colorado
Colorado Triathlon Calendar 2026-2027
Monthly updates for Colorado
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Explore the best triathlons in Colorado for 2026-2027! Our updated list features 14 exciting races across the region. Find your next race in Colorado below and join the running community at these great events!
April 2026
A springtime town to peak event in Breckenridge that starts at the Breckenridge Recreation Center, follows a 6.0 mile mostly dirt route to the ski area, then climbs to the summit of Peak 8 at 12,987 feet before a downhill finish at Peak 7.
Experience the inaugural Sky Rim Duathlon in Durango Colorado featuring a three stage run bike run format on the campus of Fort Lewis College and along the scenic Rim Drive.
May 2026
Join this eighth annual event in Colorado Springs featuring a 15 mile bike ride and 5K walk or run. Support pediatric brain cancer research while enjoying a day of community activity starting at the Buffalo Lodge Bicycle Resort.
June 2026
Experience a high altitude triathlon in the shadow of the iconic Flatirons. This event features a reservoir swim, a hilly bike course, and a scenic run through Boulders trails and roads.
The San Juan Trail Tri offers a unique three-stage adventure in Colorado's Ridgway State Park. Athletes will run a 3.5-mile trail, paddle 1.5 miles on a stand-up paddleboard, and mountain bike 8.25 miles. Individual and team options are available for..
Experience the Loveland Lake to Lake Triathlon in Colorado featuring Olympic and Sprint distances. This USAT sanctioned event offers triathlon, aqua bike, relay, and SUP options for athletes of all levels.
July 2026
The Sheep Creek Triathlon is set for July 4th in Antonito, Colorado. It features a triathlon race as well as an option to purchase an event shirt. Registration closes in early June.
The Pagosa Duathlon offers three off-road challenges near Pagosa Springs. Choose from a kids' race, a sprint, or the full Dirty Du with trail runs and mountain bike legs. Proceeds support local community services.
Join this USAT sanctioned swim and run event in Colorado Springs featuring pool swimming and a scenic run on the Santa Fe Trail for athletes of all ages.
September 2026
Durango's Valkyrie Relay is a scenic multisport team or solo challenge across trails, roads, lakes and the Animas River with full and sprint courses. Teams up to nine or solo Ultra Heptathletes combine running, biking, SUP and paddling.
Experience a USAT certified sprint triathlon in Montrose Colorado. This community event offers individual and team divisions for all ages from youth to seniors.
Experience a rugged trail adventure through the Colorado wilderness in Estes Park. Choose between a 50k run or bike and a heavy half marathon while supporting the local high school mountain bike team.
October 2026
Experience the only high altitude swimrun in the U.S. series at Horsetooth Reservoir and Lory State Park. Choose from three distances featuring rugged trails and open water swims at over 5000 feet of elevation.