Trail Running calendar near Mount Princeton 2026-2027

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 in Lake City CO is a self navigated 100 mile challenge visiting 24 proof points and checkpoints with a 48 hour cutoff. The unmarked route covers roughly 90 to 105 miles and more than 40,000 ft of elevation gain.

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 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.

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.

A high-altitude 10K in Leadville on August 16, 2026 that follows the first and last 3.1 miles of the LT100 Run course on paved and dirt roads. One aid station is provided and awards will be given in overall, para and age categories.

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 99.7 mile out‑and‑back ultramarathon in Leadville, Colorado, across forest trails and mountain roads with 15,492 feet of elevation gain and a 12,526 foot high point at Hope Pass. Finishers under 25 or 30 hours receive a belt buckle.

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 trail running event on August 22, 2026, offering a 13.3-mile half marathon with substantial elevation and a mostly downhill 5.6K. The race uses Arrowhead, Bachelor Gulch, and Beaver Creek trail networks and includes aid stations for the h..

A 5k trail run starting at 11,000 feet at Copper Mountain on August 29, 2026, presented by Mammut. The run takes place during the Union Peak Festival, which includes live music and festival activities afterward.

A 40-mile point-to-point ultramarathon from Crested Butte to Aspen across the Elk Mountains with over 6,000 feet of climbing, five aid stations, mandatory backcountry gear and mandatory tracking; proceeds support Crested Butte Nordic.

The Cirque Series at Arapahoe Basin on Sept 5, 2026 is a 9.4 miles mountain trail race with 2,211 ft of ascent on approved White River National Forest trails. The field is capped at 600 runners and includes a branded hat, bib and medal.

A mountain trail race in Creede, Colorado offering 2 mile, 12 mile, 22 mile and 50K routes through Willow Creek, historic mine sites and over the Continental Divide. The event is scheduled for September 5, 2026.

A load bearing endurance event at Staunton State Park on September 5, 2026. Routes range from 6.5 to 21.5 miles with loads from 10 to 40 lb and proceeds benefit the Special Forces Foundation.

Trail race in Empire, Colorado on September 12, 2026 offering 50K and 22K point-to-point courses on dirt single-track with high altitude views. The 50K exceeds 13,000 feet and requires prior ultra running experience.