Trail Running Calendar Colorado 2025-2026

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 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 Mountain Marmot Trail Run will take place in Durango on Saturday 20 September 2025. You can run 12 miles.

The Ouray Mountain Trail Run is a 13-mile mountain race held in Ouray, Colorado, starting and finishing at Fellin Park. Participants experience challenging terrain paired with stunning mountain views and the unique charm of the town. The event supports the Ouray School through its Parent and Teacher..

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

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

The Red Feather Trail Jamboree is a three-day trail running event held at Ben Delatour Scout Ranch in Red Feather Lakes, Colorado. Scheduled for September 26-28, 2025, it offers three race distances: a 50-mile ultra with 8,500 feet of elevation gain, a 50K with 4,200 feet gain, and a half marathon f..

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 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 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 McGinn Memorial Cross Country Challenge is held annually at Reservoir Hill in downtown Pagosa Springs, Colorado. This event features middle school and high school races, with courses running 3 kilometers for middle schoolers and 5 kilometers for high schoolers. The terrain includes a mix of hill..

The WILD Wahatoya Runs, held in La Veta, Colorado, offers three race distances: a 50K, a challenging half marathon, and an 8-mile run. Set in the scenic Cuchara Valley near the historic Spanish Peaks, the event celebrates the area's rich Native American heritage, with the mountains known as Wahatoya..

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 Deep Creek Trail Half Marathon is a scenic 13-mile trail race held near Telluride, Colorado. Starting at the Telluride Airport on Last Dollar Road, runners descend to Deep Creek Corral before entering singletrack trails through aspen-filled woods along Deep Creek. The course offers a mix of terr..

The Sangre de Cristo Trail Festival, held near Westcliffe, Colorado, offers a rugged and scenic ultramarathon experience on the Rainbow Trail in the Sangre de Cristo Mountains. Participants can choose from distances including 8-Mile, 27k, 50k, 50-Mile, 100k, and 100-Mile, all running along the wilde..

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 Hanging Flume 50K is an ultrarunning trail race held in Uravan, Colorado, starting and finishing at the historic Uravan Ballpark. The 50-kilometer course features a large loop that traverses abandoned mining two-track roads and scenic desert single-track trails near the confluence of the San Mig..

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..