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 19 exciting races across the region. Find your next race in Colorado below and join the running community at these great events!
June 2026
Loveland Lake to Lake Triathlon in Loveland Colorado offers Sprint, Olympic, aqua bike, relay, and SUP race formats on one Saturday in June. The USAT sanctioned event features a shaded lakeside venue, family amenities, and a post-race meal.
A multi sport triathlon at Boulder Reservoir featuring a sunrise swim, a fast bike course and a smooth run with the Flatirons as a backdrop. Multiple formats include Sprint, Olympic, aquabike, duathlon and relay options.
July 2026
A mixed-discipline community triathlon in Antonito, Colorado on July 4, 2026. The 3 mile event combines a 1 mile walk or jog, frisbee golf and optional river tubing, and a shirt purchase option is available.
A July 4 multi-sport event in Georgetown, Colorado combining a half-mile paddleboard, a 5.5-mile bike over paved and dirt roads, and a 5K run around Georgetown Lake, with relay options, required PFDs and helmets, and post-race festivities.
A trail duathlon in Pagosa Springs on July 11, 2026, with three formats ranging from a kids run-bike to a 7 mile run with a 15 mile mountain bike. Fees include a race shirt, food, and awards, and proceeds support a local nonprofit.
Swim and run races for youth and adults in Colorado Springs as part of the Rocky Mountain State Games, pairing pool swims with runs on the Santa Fe Trail. USA Triathlon membership is required and age groups determine distances.
Tri Boulder 2026 is a summer multisport event at Boulder Reservoir in Colorado offering sprint, Olympic and long course triathlon formats plus aquabike, duathlon and relay options. Entry fees vary and some relay team member entries are listed at zero..
August 2026
A sprint triathlon in Pagosa Springs on August 8, 2026, with a full course and a kid sprint for ages 6 to 14. Distances include an 800 yard swim, 20 km bike and 5 km run and options to compete individually or with a team.
Join this multi sport festival at Boulder Reservoir featuring gravel triathlons and aquabike races. With distances ranging from Super Sprint to relay options there are accessible events for individual athletes and the whole family.
A multi-category triathlon in Gunnison on August 22, 2026, featuring a 500 yard swim, 23K bike and 6.4K run. Events include kids, adult, and team relays with awards, participant shirts, and a post race gathering.
Multisport races at Boulder Reservoir featuring swim, bike and run courses with the Flatirons as a backdrop. Offers Sprint and Olympic triathlon formats plus duathlon, aquabike and relay options.
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 sprint triathlon in Montrose on September 26, 2026 with youth, adult, team, and family divisions. USAT membership is required and proceeds support the Montrose Recreation Foundation.
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 multi distance triathlon weekend at Highline Lake State Park in Fruita, Colorado featuring Olympic, sprint, collegiate draft legal, and off road sprint races. Relays are allowed, wetsuits are legal, and no USAT license is required.
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 single-track trails in Lory State Park, offered in three distances from 6 to 23.5 miles and hosted at Soldier Canyon Event Facility.
April 2027
A springtime town-to-peak race in Breckenridge combining a 6 mile road run or ride, a mountaintop ascent to Peak 8 at 12,987 feet, and a downhill finish, with multiple equipment-based categories and team options.
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.