Colorado
Colorado Triathlon Calendar 2026-2027
Monthly updates for Colorado
Get new running races (and updates) in your inbox every month.
Explore the best triathlons in Colorado for 2026-2027! Our updated list features 15 exciting races across the region. Find your next race in Colorado below and join the running community at these great events!
August 2026
Swim run at Wellington Reservoir on August 23, 2026 featuring three laps totalling a 1 mile swim and a 5K run, nonchip timing and onsite camping options.
A multi-format triathlon at Boulder Reservoir on August 29, 2026 featuring a sunrise swim, fast bike and smooth run with the Flatirons in view. Sprint, Olympic, aquabike, duathlon and relay options are available.
Timed indoor triathlon at the YMCA of Pueblo with a 10-minute swim, 20-minute bike, and 10-minute treadmill run; ranking by total distance and proceeds support youth programs.
September 2026
A triathlon at Lake Nighthorse in Durango, Colorado offering Sprint and Olympic distances plus Sprint relays. Swim takes place in the lake, the bike includes climbs, and the run is on dirt and gravel with lake views.
A super sprint triathlon at the U.S. Air Force Academy with age group, collegiate, cadet, and NCAA D1 women races; all profits go to the USAFA Triathlon Club.
Monthly updates for Colorado
Get new running races (and updates) in your inbox every month.
A combined 5K trail run and 3K paddle at Chatfield State Park in Littleton, Colorado, with limited participant slots and paddleboard rentals available. Categories include men's, women's, and a couples relay where teammates split the run and paddle.
A USAT certified sprint triathlon in Montrose on September 26, 2026 with youth, adult, team and family divisions. Proceeds support the Montrose Recreation Foundation and local recreational programs.
A two-day trail and bike event in Estes Park featuring 31-mile bike and run options, a 15-mile heavy half, and a 62-mile duathlon, with rugged trails, significant climbs, and aid stations supporting competitors.
A two-day triathlon at Highline Lake State Park featuring Olympic, sprint, collegiate draft legal, and off road sprint formats plus relay options for teams of 2 or 3.
A multi-discipline race at Boyd Lake State Park on September 27, 2026 featuring triathlon, duathlon, aquabike, SUP and aquathlon formats with on-site camping and USAT sanction.
October 2026
A sprint triathlon in Alamosa, Colorado on October 3, 2026 featuring a 400-yard swim, 10-mile bike and 5k run. Individual and 2- or 3-person team entries, age-group awards and finishers' medals.
A high altitude swimrun in Fort Collins combining open water swims in Horsetooth Reservoir with trail runs in Lory State Park across three distances.
Mini Tri comp only on October 31, 2026 in Fort Lupton features 15 minute swim bike run slots, combined time scoring, and prizes for fastest time and costumes.
April 2027
A springtime town to peak event in Breckenridge combining a dirt road run or ride, an alpine climb to Peak 8 at 12,987 feet, and a downhill finish.
September 2027
A one day multisport relay in Durango, Colorado combining seven back to back disciplines into team or solo formats, listed provisionally for September 18, 2027.