Trail Running calendar near Marble 2025-2026

Take on the Aspen Backcountry on August 1 in Rio Grande Park with three distances from a 50K to a hearty half marathon over rugged alpine trails and big elevation gain. Celebrate at the finish festival with live music, food trucks and famil..

High Five 100 in Lake City Colorado on August 7 2026 is a rugged mountain ultra of about 100 miles and 40,000 ft of climbing with five 14er summits. The unmarked, self supported route uses checkpoints for aid and has a 48 hour cutoff.

Run the Rockies Trail in Frisco, CO features 5K to half marathon routes on the scenic Frisco Peninsula with lakeshore finishes and reservoir views. Finishers receive a gift and an afterparty with food, music and beer for 21+.

The Leadville Trail 100 Mile Run will take place in Leadville from Sunday 16 August 2026 to Monday 17 August 2026. You can run 100 miles.

Run 40 miles across the Elk Mountains from Crested Butte to Aspen along the Grand Traverse route with more than 6,000 feet of climbing. A fundraising point to point ultramarathon with aid stations and a post race shuttle.

Run the Cirque Series at Arapahoe Basin: a scenic 9.4 miles with 2,211 ft of climbing on high alpine trails around Montezuma and Little Lenawee. Finish in Mountain Goat Plaza with live music, food, and festival vibes.

Run a scenic 13 mile mountain trail in Ouray, Colorado on September 19, 2026 and support the Ouray School. Hosted by the school Parent and Teacher Organization and the high school Outdoor Education class, this fundraiser starts at Fellin Pa..

Race high alpine trails in Crested Butte, Colorado with 50 mile, 55K and 35K options that showcase mountain meadows, ridgelines and fall foliage. Expect big climbs, stunning views and a festival finish with custom swag for all finishers.

Choose a 30K or 50K and tackle scenic single track and forest roads around Buena Vista, Colorado, with sweeping Collegiate Peaks views. Part of 14er Fest, this trail race mixes rugged desert style sections with festival weekend energy.

Sawatch Ascent is a mountain 50k in Nathrop, Colorado, around Mount Princeton spanning 33 miles and about 7,000 feet of climbing. Expect long singletrack, big alpine views, and finishers perks like a shirt, medal, and pro photos.

Sage Burner at Hartman Rocks in Gunnison Colorado offers 50K, 28K and 15K on slickrock and singletrack this October. Expect big mountain views, technical terrain and a youth focused 15K for younger runners.

Run the Rubey Rescue Run, a challenging 5K uphill trail in Aspen that climbs to the Cliff House with sweeping Maroon Bells views. Timed and dog friendly, the October race raises funds for the Aspen Animal Shelter.