Trail Running calendar near Marble 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.

An unmarked 100 miles mountain challenge around Lake City with 40,000+ ft climb, five 14ers, a 48 hour cutoff, and a committee application process, August 7 to 9, 2026.

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.

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.

Scenic road races in Ouray and Ridgway on August 15, 2026 featuring a Half Marathon, 10K and Kids Fun Run with medals and awards.

A 10K out and back on the first and last 3.1 miles of the LT100 Run in Leadville, featuring high altitude terrain and one aid station at the turnaround.

A 100 mile out-and-back ultramarathon in Leadville with over 15,000 feet of ascent, high alpine passes, 11 aid stations, a lottery entry and belt buckle finish traditions.

A mountain trail event at Arrowhead on August 22, 2026 offering a 13.3 mile half marathon with 2,844 ft gain and a mostly downhill 5.6K.

A high elevation 50 mile mountain ultramarathon in Ouray, Colorado with 23,582 feet of gain, required volunteer service, SPOT tracking, and drug tested podium prizes.

A 5k trail run at Copper Mountain starting at 11,000 feet, held during the Union Peak Festival with music and festival activities afterward.

A 40 mile point to point mountain ultramarathon from Crested Butte to Aspen with over 6,000 feet of elevation gain and mandatory backcountry gear; a fundraiser for 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.

The The Sneffels Round will take place in Ouray on Saturday 5 September 2026.

Trail Sisters Women's Half Marathon and 10K in Buena Vista, Colorado, feature trail courses through sagebrush and ponderosa pines with views of the Collegiate Peaks, and offer both group and solo participation options.

Trail races on Meadow Mountain in Minturn CO offering 11K and 5K courses with aid stations, finish refreshments, age group awards and an afterparty.

Scenic mountain races in Marble, Colorado on September 13 2026 offering a 25K loop, an 8 mile Quarry Climb, and a kids 2.5K with post race BBQ; proceeds benefit Marble Charter School.

13 mile mountain trail run in Ouray, CO on September 19, 2026; a fundraiser for the Ouray School with cupless water stations and packet pickup before the race.

A mountain ultramarathon in Crested Butte, Colorado on September 26, 2026, offered in 35K, 55K and 50 mile distances. Courses run through Gunnison National Forest with single track trails, alpine meadows, cupless aid stations, and on course..