Trail Running calendar near Leadville 2025-2026

The Grand Traverse Mountain Run is a 40-mile, point-to-point ultra from Crested Butte to Aspen, Colorado, climbing the Elk Mountains with more than 6,000 feet of elevation gain. It follows the Grand Traverse Backcountry Ski race route and is run as a fundraising event for Crested Butte Nordic. The c..

Rock Hawk Trail Races, held at Philip S. Miller Park in Castle Rock, Colorado, offer four distances: 50K, 25K, 10K, and 5K. Runners traverse the rolling Miller Park and Ridgeline trails, described as gorgeous and thrilling but not overly technical, with sweeping views.The course provides a solid cha..

The Calarat Challenge Trail Running Festival takes place in Jamestown, Colorado, at the Cal-Wood Education Center, a nonprofit dedicated to outdoor education. Held over Labor Day weekend, the event features multiple trail races including a half marathon, 10K, 5K, Kids 1K, and combination races like..

Summer Predictor SERIES - Derek Lindstrom is a fundraising running series featuring prediction games tied to two summer races. For 2025, events take place in Leadville, Colorado, and Marquette, Michigan, with the Leadville Trail Marathon (26.2 miles) and the Marquette Half Marathon (13.1 miles). Par..

The HRCA Wildcat Mountain Trail Races, held in Littleton, Colorado, offer a scenic and challenging trail running experience through the HRCA Backcountry Wilderness Area. Participants can choose from a 10-mile or 10-kilometer course, both featuring 100% dirt trails with varied terrain and stunning mo..

Cirque Series returns to Arapahoe Basin, Colorado, for a high-alpine mountain race. On White River National Forest trails above Keystone, the course runs about 9 miles with roughly 2,411 feet of elevation gain, starting at Mountain Goat Plaza at the base of A-Basin. Racers ascend via summer road to..

Devil on the Divide is a trail ultramarathon held in Empire, Colorado, offering two distances: 50K and 22K. The 100% dirt, point-to-point courses traverse stunning, remote terrain with views of Clear Creek County and the Continental Divide, reaching elevations above 13,000 feet. The 50K features abo..

The Breckenridge Oktoberfest 5K is a festive trail run held in historic downtown Breckenridge, Colorado, as part of the annual Oktoberfest celebration. Scheduled for Saturday, September 13, 2025, the 5K course winds through the scenic Town of Breckenridge Trails, showcasing beautiful fall foliage an..

Trail Sisters Women's Half Marathon & 10k takes place in Buena Vista, Colorado, tucked in the Rocky Mountains along the Arkansas River. The events include a 13.1-mile trail half marathon and a 10k. The courses wind through sagebrush and ponderosa pines, rewarding runners with views of the Collegiate..

Nestled in Old Town Nederland, Colorado (elevation around 8,236'), NedNed Trail Fest offers a long-running trail challenge with three race options: a Half Marathon (about 13.3 miles with roughly 1,408 feet of elevation gain on dirt roads and single-track trails), a 10K (about 6.3 miles on dirt roads..

The Greenland Open Space Pack Burro Race, presented by Double Rainbow Ranch, is the 4th annual event held in Larkspur, Colorado on the Greenland Open Space Trail. It offers two distances: 8 miles and 3 miles, raced by teams of one runner and one burro. The atmosphere blends friendly competition with..

Snow Mountain Ranch Trail Race is a multi-distance trail running festival at the YMCA of the Rockies in Granby, Colorado. Participants can choose from 50K, 33K, Half Marathon, 10K, and 5K, all on dirt trails with high-altitude scenery, rolling hills, and expansive mountain views. The 50K and 33K are..

Demon Dash is a 5K running or walking event held in Arvada, Colorado, featuring a new dirt course at the NAAC for a fresh home and surface. It’s pitched as a fun, community-focused experience suitable for runners and walkers of all ages. This year, the race runs in conjunction with the Demons Invite..

The Pony Express Trail Run will take place in Woodland Park on Sunday 14 September 2025. You can run between 8 and 16 miles.

Lead King Loop 25K, 8M, and Kids Run take place in Marble, Colorado, in the Elk Mountains. The flagship 25K is a dirt-road course starting at Thompson Park, winding through Beaver Lake and Lead King Basin, climbing roughly 2,900 vertical feet over about four miles into high alpine terrain, then desc..

The Pikes Peak Ascent is an uphill endurance race from Manitou Springs, Colorado, to the summit of Pikes Peak. It covers 13.32 miles with a total elevation gain of 7,867 feet. The course is described as not a typical half marathon, but a unique and demanding challenge.The event takes place in Manito..

The Pikes Peak Marathon is the 70th Annual race held in Manitou Springs, Colorado. It covers 26.2 miles with 7,834 feet of elevation gain (and loss), starting in Manitou Springs and climbing to the summit of Pikes Peak before returning to the start. Marketed as America’s Ultimate Challenge, the cour..

Crested Butte Ultra, in Crested Butte, Colorado, features 50 Miler, 55K, and 35K formats. Runners traverse the Gunnison National Forest on single-track trails through mountain meadows and up to high ridges for wide-open vistas of wildflowers, mountain backdrops, and fall foliage. The event aims to f..

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..