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 18 exciting races across the region. Find your next race in Colorado below and join the running community at these great events!
August 2026
A sprint triathlon in Pagosa Springs, Colorado on August 8, 2026, featuring a full sprint (800 yd swim, 20 km bike, 5 km run) and a kids sprint for ages 6 to 14. The race can be completed by individuals or by teams.
Family-focused gravel triathlon at Boulder Reservoir with Sprint, Super Sprint, Mini and SSS options for adults and children.
South Fork Pandemonium is an Amazing Race style, two day competition in South Fork, Colorado on August 14 and 15, 2026. Family and four person team races include surprises like rail biking, rock climbing, river floating, puzzles, and cash prizes.
Sprint distance triathlon in Gunnison with a 500 yard pool swim, 23 km bike on asphalt and a 6.4 km run on the Van Tuyl Trail, plus kids and relay 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.
An indoor triathlon at the YMCA of Pueblo combining a 10-minute swim, 20-minute bike and 10-minute treadmill run, scored by total distance covered; a community fundraiser supporting YMCA youth and family 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.
FalconTri is a super sprint triathlon at the U.S. Air Force Academy featuring a 300 m pool swim, 5 km bike and 2 km run. It includes collegiate bracket racing and an age group event with rolling starts.
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.
Triathlon weekend at Highline Lake State Park in Fruita Colorado featuring sprint, Olympic, collegiate draft legal and off road sprint races.
A lakeside multi discipline event at Boyd Lake State Park on September 27, 2026 offering sprint, supersprint, duathlon, aquabike, aquathlon and SUP race options.
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.
ÖTILLÖ Colorado USA is a high altitude swimrun in Fort Collins combining open-water swims at Horsetooth Reservoir with trail runs in Lory State Park across three distances.
A competitive mini triathlon in Fort Lupton on October 31, 2026 featuring a 15 minute swim bike run time slot format for adults ages 18 to 99.
April 2027
A spring multi-discipline race from the Breckenridge Recreation Center that combines a 6-mile bike or run, an uphill to Peak 8 at 12,987′, and a downhill finish near Peak 7.
September 2027
A multisport relay around Durango combining trail running, biking, paddling and open-water swimming. Options include a full course near 80 miles or a 53 mile Sprint, and a solo Ultra Heptathlon covering all seven disciplines.