Trail Running calendar near Glenwood Springs 2026-2027

Trail running and mountain biking near Crested Butte with 15 km and 25 km options. Courses include alpine climbs to near 11,000 ft, limited aid stations, and non traditional prize drawings.

A high altitude out and back through Leadville's historic mining district, the Silver Rush 50 Run covers about 50 miles with substantial elevation gain and a 14 hour cutoff. The weekend also includes a 15 mile race, a juniors 5K, and LT100..

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.

Trail races of 5K and 15K on July 18, 2026 at Powderhorn Mountain Resort featuring climbs on the Stagecoach Trail and a finish at the Flattop Flyer. Registration includes resort entry, shirt, finisher item, post race food and a lift pass.

A trail event on Spring Creek near Steamboat Springs on July 18, 2026, offering a **9.5 mile** loop with significant early climb and a rolling **5K** out-and-back; one aid station on the long course and a cupless policy.

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.

Mountain trail races on Vail Mountain at 10,000 feet with rerouted 10K and 5K courses, gondola access to the start, aid stations and finish food, age-group awards, t-shirts and a post-race raffle.

Grand Mesa Ultras on July 25, 2026 offers 50 mile, 55K and 30K trail races on high elevation mountain terrain with camping options, finisher awards, cash prizes, a raffle, 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 in Summit County Colorado at sustained high altitude, capped at 75 runners, with about 40,000 feet of climbing, multiple aid and sleep stations, live GPS tracking, and a multiyear deferral policy.

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.

Sheep Mountain Trail Runs in Fairplay, CO offers 50 mile, 50k and half marathon courses at high elevation with technical trails and forest roads. The event includes stocked aid stations, a finisher medal, drop down options and a 16 hour tim..

A mountain trail event in Aspen on August 1, 2026 offering 50K, marathon and heavy half-marathon mostly on dirt trails with significant elevation gain; limited on-course support and a finish festival at Rio Grande Park.

An uphill trail race in Vail that starts at Gondola One and finishes at Mid-Vail, covering about 6.9 km with 2,013 feet of climb. Aid stations provide water and sports drink, and finish-line refreshments and age-group awards are part of the..

A two day untimed trail event at New Belgium Ranger Station in Snowmass Village offering 3.76k, 5k and 10k distances. Completing all three earns the 18.76k Challenge medal; the event includes a free craft brew, medals, music, food, and vend..

Trail races on Frisco Peninsula offering 5k, 10k and a half marathon with single track and lakeshore finishes, marked courses and aid stations on the longer distances. Awards by overall and age categories and a post race plaza gathering.

Two-day mountain bike and trail running event in Steamboat Springs on August 8 and 9, 2026, featuring mostly singletrack routes and multiple race distances. Proceeds support local nonprofits Partners for Youth and Routt County Riders.

A Backyard Ultra at Loudy Simpson Park in Craig, Colorado, where runners repeat a 4.167 mile loop each hour until one remains. A separate Citizens Race offers a single 4.167 mile loop on the same scenic course.

A high altitude 100 mile out and back ultramarathon around Leadville Colorado, with over 15,000 feet of elevation gain and a high point at Hope Pass. Aid stations, drop bag locations, and pacers are part of the race structure.

Experience the high-altitude scenery of Leadville on this 10K course, which follows the first and final miles of the famous LT100 Run. With a single aid station and awards for top finishers, it's a classic mountain run. Registration is open..