Trail Running calendar near Aspen 2026-2027

Experience Crested Butte’s oldest trail challenge with running and mountain biking events. Choose between a 25 km loop or the classic 15 km sprint in this high elevation mountain competition.

A high altitude 50 mile out-and-back in Leadville on July 11, 2026 featuring about 7,500 feet of climbing and a 12,024 foot high point. The event also offers a 15 mile race, a juniors 5K, and serves as an LT100 qualifier.

Experience the STRS Horseshoe Gulch Grind in Breckenridge with short and long course options. This trail event offers categories for adults and youth starting from the Blair Witch Trailhead.

Experience a high altitude mountain race through the Sawatch range of the Colorado Rockies. This 101 mile loop features historical ghost towns and alpine passes with over 23000 feet of elevation gain.

Trail running event in Mesa, Colorado on July 18, 2026 offering 5 km and 15 km courses. Organized by the Grand Junction Sports Commission; volunteers can register and full refunds or deferrals apply if canceled for severe weather.

Experience the mountain trails of Aspen Snowmass with three distinct race distances. Runners can choose between a 50K trek across four mountains a 25K trail run or a 10K course starting from the Elk Camp Gondola.

High-altitude trail races on Vail Mountain offering 10K and 5K courses that start near Gondola One, feature singletrack and gravel sections, on-course aid stations, post-race refreshments, and age-group awards.

A three day, multi stage trail race across the Colorado continental divide from Hope Pass to Red Cliff. Options include a 51 mile Full Pint and a 35 mile Half Pint; the event is fully supported and limited to 500 runners.

Trail ultramarathons on Colorado's Grand Mesa with three distances, mountain single track, alpine scenery, camping options, awards, and post race food and beer.

Experience a historic Colorado tradition where runners and burros compete together. Navigate mountain trails and high altitude passes while carrying traditional mining gear in this unique world championship event.

A single 200 mile loop around Summit County, Colorado, running above 9,000 feet with roughly 40,000 feet of climbing. Field capped at 75 runners, live GPS tracking provided, and a multi tier deferral policy with no refunds.

STRS #4 - Tom's Baby on July 29, 2026 takes place at Tom's Baby Trailhead in Breckenridge, CO, offering short and long course entries with adult, youth, and non-binary categories and published entry fees.

Experience high elevation trail running in the mountains of Fairplay Colorado. This event offers three distances ranging from a half marathon on forest roads to technical ultramarathons through remote wilderness terrain.

A multi-distance trail running event in Aspen, Colorado, held on mostly dirt trails with substantial elevation gain. The race centers at Rio Grande Park and takes place alongside a park festival that includes live music and food.

Point to point mountain trail races in Winter Park, Colorado on August 1, 2026. Three distances offer alpine singletrack, substantial elevation change, aid stations with nutrition, and age group awards for men and women.

A mountain trail race in Vail on August 1, 2026 featuring an uphill 6.9 km course with about 2,013 feet of gain, singletrack and doubletrack terrain, an aid station, post race refreshments, awards and a raffle.

Two Brothers Up and Down in Idaho Springs offers two uphill out and back races on mixed dirt and paved roads, with steep sections and an aid station on the 10k. Both races start and finish at Courtney Riley Cooper Park.

A pack burro race in Buena Vista Colorado on Aug 2 2026 with 13.1 mile and 7.3 mile courses offered both with and without burros. Burro teams must meet specific equipment and conduct rules and finishers receive a gift and a meal.

A two day untimed trail event at New Belgium Ranger Station in Snowmass Village offering 3.76k, 5k and a 10k plus an 18.76k Centennial Challenge. Includes a free New Belgium craft brew, finisher medal and event festivities.

Trail races of 5k, 10k and half marathon on Frisco Peninsula trails with lake and mountain views, single-track sections, chip timing, aid stations, and post-race food and beer for participants 21 and older.