Trail Running Calendar Colorado 2026-2027

Experience the natural beauty of Mueller State Park with various trail distances from a 10k to 12 hour timed ultra events. Choose between traditional distance loops or a unique randomized format determined by colorful draws.

A trail race day from Buffalo Lodge Bicycle Resort featuring five distances centered on Rampart Reservoir and Rampart Range Road. Courses include a 55 mile loop, a point to point 60K, a 50K out and back, plus 24K and 15K options with aid st..

Run the Sky Pilots Ouray Backyard Ultra in Fellin Park, completing a 4.167 mile loop each hour until one runner outlasts the field. Enjoy riverside trails, mountain views near 7,700 feet and shared aid.

A 14 mile loop around Vallecito Reservoir with paved road, singletrack, dam crossing and about 1000 feet of climbing. The field is capped at 250 runners, the race is professionally timed, runs cupless, and ends with a post race meal and liv..

Trail races in Eagle, Colorado on May 16, 2026 featuring a 14K and a 6K on mostly single track. Aid stations, finish-line refreshments, age-group awards and an afterparty at Capitol Public House follow the event.

Challengers tackle a 6 mile climb gaining 2000 feet of elevation to reach the South Rim of the Black Canyon. Choose between a timed run or a scenic walk ending with a mountain breakfast and park views.

Point-to-point trail races in Carbondale, Colorado offering a 10-mile and a 28k course over Prince Creek, Buckhorn and Glassier trails; organized aid stations and a weekend film festival accompany the event.

Trail races at the YMCA of the Rockies in Estes Park on May 23, 2026 offer 50k, 25k and 10k options. The course centers on a 10 km loop with a 1,200 ft climb at Bible Point and two staffed aid stations.

Farish Trail Race at Farish Recreation Area in Woodland Park, Colorado offers a half marathon, 10K, 5K and a free 1 mile kids run. Awards go to the top three men and women and the first 200 finishers get a race hat.

Test your endurance at this Golden Colorado event following the classic backyard format with 4.17 mile laps every hour. Support the Sun Valley Kitchen and Community Center while pushing for your personal best distance.

Spirit Trail Race in Buena Vista on May 24, 2026 offers marathon, half marathon and a 9k with start and finish at South Main Town Square near the Surf Hotel; proceeds support local outdoor and community groups.

A Memorial Day trail event in New Castle, Colorado, honoring a fallen hero with riverfront routes. Options include 3.5 km and 7.7 km courses with both in person and virtual entries.

Obstacle course weekend at Fort Carson near the Rocky Mountains, with Sprint 5K, Super 10K, Beast 21K and Ultra 50K races plus kids events and an obstacle workshop. The high elevation course features steep climbs, rugged trails and multiple..

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 mountain ultramarathon near Denver offering 50 Mile and 50K options on mostly singletrack trails, passing 1996 burn areas, ponderosa pines, and granite formations. Part of the proceeds support the North Fork Volunteer Fire Department.

A Backyard Ultra on the Spurline Trail in Durango where runners complete repeated 4.17 miles loops each hour until one person remains. The event raises funds for Durango Trails and requires an entry fee plus per yard pledges.

A 20K clockwise loop around Turquoise Lake that mixes hilly paved road and single track trail, held May 30, 2026, with $40 adult registration and free entry for youth 17 and under. Proceeds support local youth athletics and recreation.

A 10K trail race through Elk Meadow Open Space Park following Pioneer Trail clockwise around the meadow, with downhill sections along Highway 74 and wooded singletrack at the mountain base. The race is cup free and has no aid stations.

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.

Trail race in Parker, CO with a steep stair incline and about 600 feet of climbing. The main event is roughly 10 kilometers and there is a one mile kids race, handicap starts, aid stations, awards, and volunteer opportunities.