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 16 exciting races across the region. Find your next race in Colorado below and join the running community at these great events!
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.
Super sprint triathlon at the U.S. Air Force Academy with collegiate bracket racing, an open age-group rolling start, and proceeds donated to the USAFA Triathlon Club.
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.
Experience two days of mountain endurance in Colorado with technical mountain bike and trail running races including a 50K ultra and the 100K Epic Double challenge.
Monthly updates for Colorado
Get new running races (and updates) in your inbox every month.
Experience a diverse weekend of racing at Highline Lake State Park with road and off road triathlons featuring sprint and Olympic distances in western Colorado.
A multi-format race day at Boyd Lake State Park with triathlon, SUP, duathlon, aquabike, and aquathlon options, onsite camping and spectator-friendly looped courses.
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.
Swimrun at over 5,000 feet near Fort Collins combining open water swims in Horsetooth Reservoir and trail running 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.
February 2027
Late February Run, bike, run duathlon at Cherry Creek State Park with two 2.5 mile runs and an 11 mile paved bike course; winter course conditions possible.
April 2027
Experience a unique springtime challenge in Breckenridge featuring a 6-mile bike or run followed by a significant mountain ascent to nearly 13,000 feet and a final descent.
June 2027
IRONMAN 70.3 Boulder on June 12, 2027 features a reservoir swim, hilly bike and run at higher elevation near the Flatirons.
A three-day high-elevation dirt festival in Alma Colorado featuring mountain bike races, off-road duathlon, trail runs, family kids races and on-site camping.
Two-day Amazing Race style event in South Fork, Colorado with a family day for ages 5 and up and a teams-of-four race featuring varied challenges and cash prizes.
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.