Trail Running calendar near Keystone 2025-2026

The Cirque Series race at Arapahoe Basin, Colorado, is a challenging 9.2-mile trail run with 2,411 feet of vertical gain, set in the scenic White River National Forest. Starting at 10,780 feet at Mountain Goat Plaza, the course ascends through diverse terrain including summer roads, singletrack hiki..

The Breckenridge Oktoberfest 5K will take place in Breckenridge from Friday 12 September 2025 to Sunday 14 September 2025. You can run 5 kilometers.

Run Rabbit Run is a challenging ultramarathon event held in Steamboat Springs, Colorado, featuring 50-mile and 100-mile races through the scenic Routt National Forest. The 50-mile course starts at the Steamboat Springs ski area (6,900 ft elevation), ascending to Mount Werner (10,568 ft), crossing th..

The Ned Ned Half Marathon, held in Nederland, Colorado, is a celebrated trail running event with a 43-year tradition. The race features a challenging 13.3-mile course with 1,408 feet of elevation gain, winding through dirt roads and single-track mountain trails that showcase the scenic beauty and hi..

The Snow Mountain Ranch Trail Running Festival, held at the YMCA of the Rockies in Granby, Colorado, offers a scenic and challenging trail running experience with race distances of 50K, 33K, Half Marathon, 10K, and 5K. Set amidst rolling hills, golden aspen groves, and mountain vistas, the courses f..

The Pony Express Trail Run is a scenic trail race held at Rampart Reservoir near Woodland Park, Colorado, at elevations between 9,000 and 9,400 feet. Offering two distance options—8.5 miles and 16 miles—the course features rolling single-track dirt trails with rocky sections and exposed roots, inclu..

The Lead King Loop 25K is a scenic running and hiking event held in the heart of Colorado's Elk Mountains near Marble. Participants can run, walk, or hike the 25K course that winds through Lead King Basin, past the iconic Crystal Mill, and through the historic Town of Crystal, showcasing breathtakin..

The Frederick Pack Burro Race will take place in Frederick on Saturday 20 September 2025. You can run between 6 and 10 kilometers.

The Pikes Peak Marathon will take place in Manitou Springs on Sunday 21 September 2025. You can run 26 miles.

The Crested Butte Ultra, held in Crested Butte, Colorado, offers runners a challenging and scenic experience through the Gunnison National Forest. The event features three distances: a 50-mile, 55K, and 35K race. Participants traverse single-track trails that wind through mountain meadows, ridges, a..

The Emerald Mountain Trail Run takes place in Steamboat Springs, Colorado, offering two race distances: a 12k (approximately 7.75 miles) and a 4-mile run. The scenic course starts at the base of Howelsen Hill and winds through aspen-lined single-track trails on Emerald Mountain. The event welcomes h..

The West Line Winder is a scenic trail running event held in Buena Vista, Colorado, featuring two race distances: a 50K (30.6 miles) with 4,000 feet of ascent and a 30K (18.1 miles) with 2,080 feet of ascent. The courses traverse buttery singletrack trails, forest roads, and some paved sections, set..

The Golden Leaf Half Marathon is a scenic running event held annually in late September, starting at Fanny Hill in Snowmass and finishing at Koch Lumber Park in downtown Aspen, Colorado. The course follows the Government Trail, winding through beautiful Aspen groves, offering runners a picturesque a..

The 24 Hours of Palmer Lake is an endurance running event held in Palmer Lake, Colorado, featuring a 24-hour race on a scenic 0.82-mile loop course atop the Palmer Divide at 7,240 feet elevation. Surrounded by mountains, the race offers a community-driven atmosphere focused on pushing mental and phy..

The Sawatch Ascent 50k is a challenging high-alpine trail race held in Nathrop, Colorado, showcasing the stunning Sawatch Range. Covering 33 miles with 7,000 feet of vertical gain, the course features a mix of 26 miles of singletrack, paved, and gravel roads, including 12 miles on the Colorado Trail..

The 14er Fest 14K is a unique trail race held in Buena Vista, Colorado, in the heart of the Rocky Mountains. Covering 8.7 miles with over 500 feet of elevation gain, the course offers stunning views of the Collegiate Peaks, Arkansas River, and Buena Vista town. Runners start in the vendor village, t..

The Above the Clouds Ultra is an annual trail running event held in Woodland Park, Colorado, known as the "City Above the Clouds." It features two race distances: a 50K ultra and a 10K. The course showcases stunning Colorado fall colors and offers fast, flowing singletrack trails around Rampart Rese..

The Castle Rock Trail Festival, held in Castle Rock, Colorado, offers a variety of trail running events on the scenic ridgeline trails of Philip S. Miller Park and Ridgeline Open Space. Distances include a 5K, 10K, half marathon, and an ultra-distance 50K, catering to runners of all levels.Families..

The Bear Chase is an endurance trail race festival held at Bear Creek Lake Park in Lakewood, Colorado. It offers multiple distances including 100K, 50 Mile, 50K, Half Marathon, 10K, and 5K, catering to both first-time ultramarathoners and experienced trail runners. The course features mostly dirt an..

Rocky's Backyard Ultra is a unique ultra trail race held at the YMCA of the Rockies in Estes Park, Colorado, known as the highest organized Backyard Ultra in the world. Runners complete 4.167-mile laps on a challenging singletrack course featuring about 500 feet of elevation gain and loss per lap, w..