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 12 exciting races across the region. Find your next race in Colorado below and join the running community at these great events!
October 2026
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
A winter gravel bike rally and trail run in Lyons, Colorado offering multiple run and ride distances, mixed terrain courses, and a public finish-line party with food and music.
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
A spring town-to-peak race in Breckenridge combining a bike or run to the resort, a climb to Peak 8, and a final downhill finish with multiple race categories.
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 is a 70.3 triathlon in Boulder, CO with a reservoir swim, hilly bike and run courses and racing at higher elevation.
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.
July 2027
High altitude 50 mile trail run in Leadville on July 10, 2027 with about 8,000 feet of elevation gain; registration opens January 7, 2027.
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.
Seven discipline team relay in Durango, Colorado on September 18, 2027 where teams complete trail run, mountain bike, swim, paddleboard, road cycle, river paddle and road run.
Multi-discipline lake races at Boyd Lake State Park near Loveland Colorado with on-site camping, USAT sanctioning and multiple distance options.