Trail Running calendar near Aspen 2026-2027

Trail-based chip timed half marathon and 5K near Fraser, Colorado, on unpaved roads and trails, with aid stations and proceeds supporting the Shining Stars Foundation.

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.

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.

A one day trail running festival at YMCA of the Rockies in Granby, Colorado on September 12, 2026 featuring 50K, 33K, half marathon, 10K and 5K on dirt and grass trails with loop formats, aid stations, drop bag access and on site lodging an..

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.

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 offering 11K and 5K courses on singletrack and dirt trail, with aid stations, post-race refreshments, and series awards.

Mountain trail and road races in Marble, Colorado featuring a 25K Lead King Loop, an 8 mile Quarry Climb, and a kids 2.5K with proceeds to Marble Charter School.

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..

Experience desert style single track and forest roads with views of the Collegiate Peaks in Buena Vista. Choose between 50k or 30k distances as part of the multi sport 14er Fest.

A half marathon from Fanny Hill in Snowmass along the Government Trail through aspen groves to Koch Lumber Park in downtown Aspen.

A point to point trail race from Vail to Minturn with 26K and 14K courses across Vail Mountain. Both routes feature alpine singletrack, scenic views of Mt. Holy Cross, staffed aid stations and a post race lunch voucher.

A *5K* trail run on Town of Breckenridge Trails that finishes at Blue River Plaza on Main Street during Breckenridge Oktoberfest. Field limited to 300 runners; first 250 registrants receive a long-sleeve technical tee and 21+ entrants get a..

A high alpine 50k in Nathrop, Colorado, featuring Colorado Trail singletrack, about 7,000 ft of climb and panoramic Sawatch Range views.

A fall trail event in Buena Vista, Colorado on September 27, 2026 offering a 14K trail race with over 500 feet of elevation gain and a 5K along the Arkansas River. Both races start and finish at Vendor Village near the Eddyline Beer Garden.

Trail races of 50K, 28K and 15K take place in Hartman Rocks near Gunnison Colorado on October 3 2026. The course mixes slickrock, singletrack and doubletrack with wide mountain and basin views.

A point-to-point trail marathon and 30K in Colorado’s North Fork Valley at peak fall color, with mountain climbs to Inter-Ocean Pass and proceeds funding summer camp scholarships.

The Camp 4 Coffee Cart to Cart Trail Race will take place in Crested Butte on Saturday 3 October 2026. You can run between 10 and 19 miles.