Trail Running calendar near Mount Princeton 2026-2027

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 Colorado features 50 mile, 50K and Half Marathon courses on high‑elevation mountain trails with maps, aid stations, and midrace drop options.

High alpine trail running in Aspen with 50K, marathon and heavy half marathon options and a finish festival at Rio Grande Park.

A steep 4.3 mile uphill trail race from Vail Village to Mid Vail with significant elevation gain, on course aid stations, finish food and age group awards.

Two Brothers Up and Down in Idaho Springs on August 1, 2026 features steep out and back courses on dirt and pavement with major elevation gain for 5k and 10k.

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.

The High Five 100 - Lake City, CO will take place in Lake City on Friday 7 August 2026. You can run 100 miles.

A two-day multi-distance run and hike in Snowmass Village offering 3.76k, 5k and a single 10k with an 18.76k challenge and a post-race New Belgium brew.

Trail races of 5K, 10K, and half marathon on Frisco Peninsula trails with lakeshore finishes at Dillon Reservoir on August 8, 2026.

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 in Leadville, Colorado at over 10,000 feet where each team is one runner and one burro carrying mining tools. The long course is about 21 miles and a shorter 6 to 8 mile course is planned.

Trail run on August 12, 2026 at Carter Park in Breckenridge offering short and long course entries with adult youth and non binary categories.

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.

A high-elevation 10K in Leadville on the opening and closing miles of the LT100 Run course, featuring one aid station, age-group awards, and community race-week activities.

A 200 mile mountain loop race around the La Garita range starting and finishing in South Fork, CO featuring high alpine tundra and forested mountain parks.

A 100-mile out-and-back ultramarathon in Leadville, Colorado with about 15,492 feet of climb, a summit at Hope Pass and 11 on-course aid stations.

A trail race at Staunton State Park offering 26.3 mile and 13.1 mile courses over mostly singletrack with significant elevation gain, well marked trails, capped fields, and fully stocked aid stations.

A mountain trail half marathon and a mostly downhill 5.6K in Arrowhead, Colorado, featuring shuttle access, multiple aid station stops on the half, awards and postrace refreshments.

Four trail races in Evergreen range from 5K up to a half marathon, with varied meadow and mountain courses, shuttle service at Alderfer, and onsite amenities.