Trail Running Calendar Colorado 2025-2026

The 10k @ 10,000 Feet is a renowned trail running event held in Steamboat Springs, Colorado, celebrated for its stunning mountain scenery. Voted the best 10k in Colorado by Colorado Runner Magazine in 2010, the race features a challenging course that starts at an elevation of 10,000 feet on Rabbit E..

The American Heroes Run is a commemorative running event held in Longmont, Colorado, designed to honor the heroes of 9/11 and celebrate patriotism. Participants can choose from various race distances, including a 100-mile run, marathon, half-marathon, 9.11-mile run, and a 5K, all set on a scenic 1.0..

The Cirque Series - Arapahoe Basin is a challenging mountain running event set for September 6, 2025, in Keystone, Colorado. Participants will tackle a 9.4-mile course with an elevation gain of 2,411 feet, starting at 10,780 feet. The race features three divisions: Sport, Expert, and Pro, catering t..

Devil on the Divide is a challenging trail running event held in Empire, Colorado, featuring two race options: a 50K and a 22K. Participants will experience breathtaking views of Clear Creek County and the Continental Divide, with the 50K course reaching altitudes over 13,000 feet and over 6,500 fee..

The Black Squirrel Half Marathon, scheduled for September 6, 2025, takes place in Lory State Park, Bellvue, Colorado. This challenging 13.5-mile trail race features a mix of technical and non-technical terrain, with approximately 2,000 feet of elevation gain. Runners will enjoy stunning views of Hor..

The HRCA Wildcat Mountain Trail Races, scheduled for September 6, 2025, in Littleton, Colorado, features a variety of events including a 10K, 10M, and a Kid's Race. The race begins at the Douglas County East/West trailhead and takes participants through the scenic HRCA Backcountry Wilderness Area. R..

Run Rabbit Run is an exhilarating running event taking place in Steamboat Springs, Colorado, featuring challenging 50 and 100-mile courses through the stunning Routt National Forest. Participants will experience breathtaking fall colors and rugged mountain terrain, including climbs to elevations ove..

The Breckenridge Oktoberfest 5K is an exciting running event that kicks off the annual Oktoberfest celebration in Breckenridge, Colorado. Set against the stunning backdrop of the changing aspens and beautiful mountain scenery, this 5K trail run takes participants through the picturesque Town of Brec..

The MeadowGold 5K & 11K is a scenic running event organized by the Vail Recreation District, taking place in Minturn, Colorado. This race is part of the Vail Trail Running Series and offers participants a chance to experience the beautiful mountain trails while competing in either a 5K or an 11K dis..

The Blisters & Brews Telluride 5k will take place in Telluride on Saturday 13 September 2025. You can run between 5 and 5 kilometers.

The Snow Mountain Ranch Trail Race, taking place on September 13, 2025, in Granby, Colorado, is a scenic trail running festival featuring multiple race distances: 50K, 33K, Half Marathon, 10K, and 5K. Set against the stunning backdrop of the Rockies, participants can enjoy the vibrant fall colors an..

The Ned Ned Run is a celebrated annual running event held in Nederland, Colorado, featuring a variety of race options including a Half Marathon, 10K, and 5K. This family-friendly event encourages participants to enjoy the scenic beauty of the area while navigating dirt roads and single track trails...

The Ouray 50 Mile Endurance Run is a challenging ultramarathon set in the stunning mountain scenery of Ouray, Colorado. With an elevation gain of 23,582 feet, this race is designed to be more difficult than many 100-mile events, featuring highly technical trails and an average elevation of nearly tw..

The Pony Express Trail Run is a scenic trail 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 single-track trails, creeks, and the vibrant colors of autumn. The event is intention..

The Pikes Peak Marathon, established in 1956, is the oldest continuously held marathon in the United States. This challenging race takes participants from Manitou Springs, Colorado, to the summit of Pikes Peak, reaching an elevation of 14,115 feet, and back down, covering a total of 26.2 miles. The..

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 three race distances: a 50-mile, a 50K, and a half marathon, all designed to be beginner-friendly while sti..

The Crested Butte Ultra is an exciting running event set in the picturesque Crested Butte, Colorado, known for its exceptional trails. Participants can choose from three race distances: 50 miles, 55K, and 35K, all of which traverse the stunning landscapes of the Gunnison National Forest. Runners wil..

The WILD Wahatoya Runs is an exciting running event set in the picturesque Cuchara Valley, Colorado, featuring a 50K, half marathon, and an 8-mile race. Participants will experience stunning views of the Spanish Peaks while running through the historic town of La Veta. The event coincides with the t..

The West Line Winder is a scenic trail running event held in Buena Vista, Colorado, featuring both 30K and 50K races. Set against the stunning backdrop of the Collegiate Peaks, participants can enjoy a mix of singletrack and forest roads, with significant elevation gain. This event caters to runners..

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