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 18 exciting races across the region. Find your next race in Colorado below and join the running community at these great events!
February 2027
A winter bike rally and trail run in Lyons, Colorado offering multiple run and ride distances plus an afterparty with food, music and saunas.
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
An annual spring race in Breckenridge combining a 6 mile bike or run to the ski area, an ascent to Peak 8 at 12,987′ and a downhill finish near the Peak 7 base.
May 2027
Sprint triathlon at CSU Pueblo with a 5K run, 12.6 mile bike to Pueblo Memorial Airport, and a 300 yard pool swim; relay, duathlon, and youth races also available.
June 2027
A mixed gravel-bike and trail-running festival in Lyons, Colorado on June 6, 2027, featuring races from 100K to 5 miles plus relays, BMX, camping and a concert.
Monthly updates for Colorado
Get new running races (and updates) in your inbox every month.
IRONMAN 70.3 Boulder on June 12, 2027 features a reservoir swim, hilly bike and run near the Flatirons and Boulder Reservoir with World Championship qualification available.
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.
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.
A multi sport triathlon at Boulder Reservoir featuring a sunrise swim, bike and run with Flatirons views and options from Sprint and Olympic to Aquabike, Duathlon and relays.
July 2027
Silver Rush 50 Run is a 50 mile mountain course in Leadville with about 8,000 feet of elevation gain and serves as a qualifier for the Leadville Trail 100 Run.
A single-day multisport event at Boulder Reservoir offering sprint, Olympic, long-course, aquabike, duathlon and relay races, including the BEAST 100.
August 2027
Family oriented gravel triathlon at Boulder Reservoir with Sprint, Super Sprint, youth races and relay and aquabike options.
A lakeside triathlon at Boulder Reservoir featuring a sunrise swim, fast bike and smooth run with Flatirons views, offered in Sprint, Olympic, duathlon, aquabike and relay formats.
September 2027
Triathlon at Lake Nighthorse in Durango, Colorado featuring sprint and Olympic distances, lake swim, road bike with climbs, and a dirt/gravel run.
Harvest Moon Triathlon at Boulder Reservoir on September 12, 2027 offers a half distance triathlon plus Olympic, sprint, aquabike, duathlon and relay options.
Seven discipline one day multisport relay in Durango, Colorado on September 18, 2027. Teams of two to nine, with ultra and solo entry options.
A lakefront multisport event at Boyd Lake State Park on September 26, 2027 offering triathlon, duathlon, aquabike and SUP races with on-site camping and spectator friendly courses.
A high-altitude swimrun in Fort Collins mixing open-water swims at Horsetooth Reservoir with trail runs in Lory State Park, offered in three race distances.