Trail Running calendar near Mount Princeton 2026-2027

A combined national high school trail championship and a citizens race on the Salida Mountain Trails in Salida, Colorado on July 25, 2026. The 5.4 mile singletrack course includes steep climbs, switchbacks and a high point near 7,558 ft.

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 on trails, 4WD roads and rec paths, with elevations above 9,000 ft and sections over 12,700 ft. The field is capped at 75 runners and includes 12 aid stations, four sleep stations, and l..

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.

Trail races in Aspen offering 50K, marathon and heavy half-marathon on dirt trails with high alpine sections and significant elevation gain. Limited support and remote aid stations; finish-day festival and local Duck Derby take place at Rio..

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.

High Five 100 is a self guided 100 mile challenge from Lake City, Colorado that visits 24 proof points and checkpoints in order. Runners navigate their own route, face significant elevation gain, and must return within a 48 hour cutoff.

A two day running event in Snowmass Village on August 7 and 8, 2026 offering 3.76k, 5k and a single 10k plus an 18.76k challenge. Finishers receive a free New Belgium brew and event medals; proceeds support local nonprofits.

Trail races of 5k, 10k and half marathon on Frisco Peninsula trails with single track, lakeshore finishes, chip timing, aid stations for the 10k and half, and post race food and beer for participants 21 and older.

Trail run at Rampart Reservoir with 8 mile and 16 mile options on single track and rocky sections. Entry is limited to 150 and registration closes August 5, 2026.

A traditional pack burro race at 10,200 ft in Leadville, Colorado on August 9, 2026. Teams of a runner and a burro follow marked mountain routes over historic mining trails with long and shorter course options and strict animal welfare rule..

STRS #5 Carter Park Scurry in Breckenridge on August 12 2026 offers short and long course entries across adult youth and non-binary divisions with published entry fees and a course map.

Experience the trails of Cheyenne Mountain State Park with three race distances ranging from a 5K walk to a 25K mountain challenge. This chip timed fundraiser supports park conservation through scenic and high elevation courses.

Summit Grays and Torreys Peaks in this 8.8 mile Colorado endurance event. Participants must carry a 20lb dry load while tackling 4,101 feet of elevation gain.

Leadville Trail 10K on August 16, 2026 is a 6.2-mile out-and-back on paved and dirt roads using the opening and closing sections of the LT100 Run course. The race features one turnaround aid station, branded on-course nutrition, and multipl..

A 200 mile loop race through the La Garita mountains around South Fork, CO, reaching elevations just under 13,000 feet. Organized by Tempest Adventures, registration closes Aug 1 and the listed entry fee is 1268 USD.

A 100 mile out and back ultramarathon in Leadville on August 22, 2026, featuring high alpine terrain and a peak at Hope Pass. The course covers about 99.7 miles with around 15,492 feet of elevation gain and includes 11 aid stations.