Trail Running Calendar Colorado 2024-2025

The Grand Traverse Mountain Run is a challenging 40-mile ultra marathon that takes place from Crested Butte to Aspen, Colorado, traversing the scenic Elk Mountains. Participants face over 6,000 feet of elevation gain, following the same route as the Grand Traverse Backcountry Ski race. This event se..

The Creede Mountain Run, established in 1987, is a celebrated running event held in Creede, Colorado, marking the transition from summer to fall. Participants can choose from four race distances: 2 miles, 12 miles, 22 miles, and 50K, all set against the stunning backdrop of the San Juan Mountains. T..

The 10k @ 10,000 Feet is a renowned trail running event held in Steamboat Springs, Colorado, celebrated for its stunning mountain scenery. Scheduled for August 31, 2025, the race features a challenging 10k course that actually measures 6.8 miles, starting at the summit of Rabbit Ears Pass. Participa..

The Emerald Mountain Trail Run, part of the Steamboat Springs Running Series, features two scenic distances: a 12k (approximately 7.75 miles) and a 4-mile run or hike. Set against the stunning backdrop of northern Colorado, the race begins at Howelsen Hill and winds through aspen-lined single tracks..

The HRCA Wildcat Mountain Trail Races, scheduled for September 6, 2025, in Littleton, Colorado, features a variety of events including a 10-mile race, a 10K, and a Kid's Race. The races take place on scenic dirt trails within the HRCA Backcountry Wilderness Area, offering participants stunning mount..

The Cirque Series at Arapahoe Basin is a thrilling mountain running event scheduled for September 6, 2025. Participants will tackle a challenging 9.4-mile course with an elevation gain of 2,411 feet, starting from the base at 10,780 feet. The route features stunning views and diverse terrain, includ..

The Black Squirrel Half Marathon, scheduled for September 6, 2025, takes place in Lory State Park near Fort Collins, Colorado. This challenging 13.3-mile race features approximately 2,000 feet of elevation gain and descent, offering runners stunning views of the Horsetooth Reservoir and the Rocky Mo..

Run Rabbit Run is an exhilarating running event taking place in Steamboat Springs, Colorado, featuring 50 and 100-mile races through the stunning Routt National Forest. Scheduled for September 12-13, 2025, participants can choose between the 100 Mile Hares and Tortoises, or the challenging 50 Miler...

The Snow Mountain Ranch Trail Running Festival, taking place in Granby, Colorado, offers a stunning backdrop for runners of all levels. Participants can choose from various race distances, including a 50K, 33K, Half Marathon, 10K, and 5K, all set against the picturesque scenery of rolling hills and ..

The Pony Express Trail Run is a scenic running event held at Rampart Reservoir, featuring two distance options: 8.5 miles and 16 miles. Set at an elevation of over 9,000 feet, participants can enjoy beautiful trails, creeks, and wildlife amidst Colorado's autumn scenery. The race is intentionally ke..

The Pikes Peak Ascent and Marathon, established in 1956, is renowned as America's ultimate challenge, featuring the oldest continually held marathon in the U.S. The marathon covers a grueling 26.2 miles from Manitou Springs to the summit of Pikes Peak, ascending approximately 7,800 vertical feet. Th..

The Red Feather Trail Jamboree is a three-day trail running event scheduled for September 26-28, 2025, in the scenic Red Feather Lakes region of Northern Colorado. Participants can choose from various distances, including a 50-mile, 50K, and half marathon, all designed to challenge runners while rem..

The Sangre de Cristo Trail Festival, organized by the Human Potential Running Series, invites participants to experience a rugged ultra run along the scenic Rainbow Trail in the Sangre de Cristo Mountains. Scheduled for September 27-28, 2025, the festival features various distances, including 8-Mile..

The Crested Butte Ultra is an exciting trail running event set in the stunning landscapes of Crested Butte, Colorado, known for its exceptional trails and breathtaking views. Participants can choose from three race distances: 50 miles, 55K, and 35K, all set against the backdrop of the Gunnison Natio..

The 24 Hours Of Palmer Lake will take place in Palmer Lake from Saturday 27 September 2025 to Sunday 28 September 2025.

The Golden Leaf Half Marathon is a scenic running event that takes place annually in Aspen, Colorado. The race begins at Fanny Hill in Snowmass and follows the picturesque Government Trail, winding through beautiful aspen groves before finishing at Koch Park in downtown Aspen. This popular half mara..

The West Line Winder is a scenic trail running event featuring 30K and 50K races set in the picturesque Colorado Rockies, specifically in the San Isabel National Forest and surrounding areas. This event caters to all levels of runners, from beginners to seasoned ultramarathoners, offering a mix of s..

The Deep Creek Trail Half Marathon is a scenic trail running event taking place in Telluride, Colorado. The race begins at Last Dollar Road near the Telluride Airport and features a picturesque course that winds through Aspen-filled woods along the Deep Creek Trail, covering approximately 13 miles o..

The Bear Chase Race Endurance Festival, held at Bear Creek Lake Park in Lakewood, CO, features a variety of race distances including 100K, 50 Mile, 50K, Half Marathon, 10K, and 5K. This event is ideal for both novice and experienced trail runners, offering a mix of challenging terrain and stunning v..

The Emerald Mountain Trail Run is a scenic running event taking place in Steamboat Springs, Colorado, featuring two race distances: a 12k (approximately 7.75 miles) and a 4-mile run. The course begins at the base of Howelsen Hill and winds through beautiful aspen-lined single track trails. This even..