Trail Running Calendar Colorado 2026-2027

At Fort Carson near Pike's Peak on May 30 to 31, 2026, Spartan offers multiple obstacle races at high elevation. Events range from a kids 1 to 3 km race to a 50 km Ultra and include a pre event workshop and spectator access.

A multi distance running festival in Eaton, Colorado on May 30 to May 31, 2026 offering races from 7K to 100 Mile plus relay and timed events. The venue uses a 2 mile groomed loop and provides glamping and onsite amenities including sauna a..

A trail ultramarathon in Buffalo Creek, Colorado offering 50 mile and 50K courses on mostly singletrack through burned areas and ponderosa forest. Portions of proceeds support the North Fork Volunteer Fire Department and local groups.

A Backyard Ultra on May 30, 2026 in Durango: runners complete a repeated 4.17-mile loop each hour until one remains. The event raises funds for Durango Trails and requires an entry fee plus a per-yard pledge minimum.

A 20K loop around Turquoise Lake that starts on hilly paved road and finishes on single track dirt trail, with proceeds supporting local youth athletics. The 2026 edition follows a rerouted course due to storm damage.

A 10k trail race in Elk Meadow Park near Buchanan Park Recreation Center in Evergreen, CO, featuring a rolling-hills course, vendor tents and refreshments. The event is cup-free with water refills at the start and finish.

A four race trail series in Evergreen offering distances from 5K to half marathon across Elk Meadow, Alderfer, Staunton State Park and Bergen Peak. Events include vendor tents, rec trailer activities, and refreshments for participants and s..

A scenic *5 km* cross country race at the Leadville National Fish Hatchery on May 31, 2026, with dirt road, path and trail sections. Awards are given by age group and youth registration is free.

A trail race in Parker CO on May 31, 2026 featuring a Dipsea-style staggered start for the 10k, a steep stepped incline, rolling singletrack, and a kids 1 mile route to the top and back down.

Six trail races across Summit County, Colorado, in summer 2026. Series registration includes long and short course options with adult, youth, and non binary categories and events at multiple Summit County trail heads.

A three-race summer trail series in Durango pairing professionally timed 5K to 10K trail races with local breweries and nonprofit partners. Each event includes post-race celebrations, awards, and a free beer for 21+ attendees.

A mountain trail event in Snowmass Village on June 5-6, 2026 offering a 6.6 mile Red Loop and timed 6 hour and 24 hour ultras, with campground hub, on-site amenities, and 2026 as the final year at Snowmass.

A two-day team relay in Snowmass Village on June 5 to 6, 2026, featuring teams of four or eight covering 120 miles and 17,888 feet of gain, with camping, village amenities and alpine trail scenery.

Trail races at Granby Ranch Resort in Colorado offer multiple distances including a 14 hour Elevation Challenge based on completed loops. The combined field is capped at 250 and the event includes aid stations, drop bag options, and on-site..

A looped trail ultrafestival in Mueller State Park on June 6 to 7 2026 offering 100 mile, 100k, 50k and 25k races on smooth single and double track. Aid stations are crew accessible and a night run takes place at sunset.

A community memorial event in Colorado Springs offering an in-person 5K, a virtual 5K with mailed shirts and medals, and a 1 mile kids dash. All proceeds are donated to local charities in Aiden's name.

A trail event near Beulah, Colorado offering 50-mile and ~101-mile options across the Wet Mountains, with large elevation range and distinct east- and west-side ecosystems.

A festival at Luvin Arms Animal Sanctuary in Erie Colorado featuring multiple distance and timed events on a mostly flat off road loop with Rocky Mountain views and sanctuary animals nearby.

A final edition trail race at Devil's Backbone Open Space in Loveland, Colorado featuring a looped 10k+ course, a staffed water stop near 3 miles, flour-arrow markings, informal stick-based placings, and an awards gathering at Loveland Alew..

A mountain trail *10K* on Vail Mountain at nearly 9,000 feet with varied terrain, two cupless aid stations and a mass-start format. The race includes multiple age categories from 12+ and a $12,200 prize purse.