Trail Running Calendar Colorado 2025-2026

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.

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 La Veta and surrounding areas. The event celebrates the loca..

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 tracks, making it a pic..

The Sawatch Ascent is a challenging 50k running event set in the stunning Colorado mountains, taking place on September 28, 2025. Starting and finishing at the base of Mount Princeton, participants will experience a significant elevation gain of 7,000 feet, reaching a high point of 13,150 feet. The..

The Hanging Flume 50K is an ultrarunning trail race set in the scenic landscape of Southwestern Colorado, starting and finishing at the historic Uravan Ballpark. The course features a large loop that primarily follows abandoned mining two-track and desert single-track trails, offering participants s..

The Rim to Rim Royal Gorge Races is an exciting running event featuring a 5K road run, an 8-mile trail run, and a half marathon trail run, all set against the stunning backdrop of the Royal Gorge Bridge in Canon City, Colorado. Participants will experience challenging terrains and breathtaking views..

Rocky's Backyard Ultra is an exciting ultra trail running event held at the YMCA of the Rockies in Estes Park, Colorado. This unique race format challenges participants to complete a 4.167-mile loop every hour until only one runner remains. The course features stunning Rocky Mountain scenery, with a..

The Bear Chase Race is an endurance festival held at Bear Creek Lake Park in Lakewood, Colorado, featuring a variety of race distances including 100K, 50 Mile, 50K, Half Marathon, 10K, and 5K. Scheduled for October 4-5, 2025, this event is ideal for both novice and experienced trail runners, offerin..

The Above the Clouds Ultra is an annual running event held in Woodland Park, Colorado, featuring 50k and 10k races. Set against the stunning backdrop of Pikes Peak, participants experience the vibrant fall colors and scenic trails of Rampart Reservoir. The course begins in the "City Above the Clouds..

The Castle Rock Trail Festival, also known as the liveBIG Run, invites participants to challenge themselves on the scenic trails of Philip S. Miller Park and Ridgeline Open Space. This event caters to a wide range of athletes, offering various race options including a 5K, 10K, half marathon, and a 5..

The West Elk Challenge is a scenic trail marathon set in the stunning West Elk Mountains of Colorado, taking place on October 4, 2025. Participants can run, walk, or hike through vibrant fall foliage, starting at Crawford Reservoir State Park and traversing gravel roads and single-track trails. The..

The Pikes Peak Road Runners Fall Series is a popular cross-country running event featuring four trail races held in various parks around Colorado Springs. Each race offers a unique challenge, with distances increasing from 3.8 miles to 7.4 miles as the series progresses. Participants must be at leas..

The Sage Burner Trail Race takes place in the scenic Hartman Rocks Recreation Area in Gunnison, Colorado, surrounded by stunning views of the Maroon Bells and San Juan Mountains. This challenging event features a variety of terrains, including technical slickrock and smooth singletrack, making it a..

Rabbit Valley Ultras is an exciting new ultra-running event set in the scenic Grand Valley area of Mack, Colorado. Participants can choose between two distances: a 50k and a 100k, with the course featuring two segments and a central aid station. The event emphasizes a natural, unpaved environment, a..

The Blue Sky Trail Marathon and Half Marathon, scheduled for October 18-19, 2025, takes place in Fort Collins, Colorado, featuring scenic trails between Horsetooth Mountain Park and Devil’s Backbone Open Space. The marathon covers 26.7 miles with an elevation gain of 3,500 feet, while the half marat..

The Indian Creek Trail Runs, organized by the Human Potential Running Series, is a celebrated annual event taking place at Indian Creek Campground in Sedalia, Colorado. Known as the "Fall Classic," this race showcases some of the finest single-track trails in the Denver Metro area, allowing particip..

The Great Trailhead Foot Race features both a 10-mile and a 5-mile race, set against the scenic backdrop of Bear Creek Lake Park in Lakewood, Colorado. Participants can enjoy a mix of single-track and dirt trails while racing. Registration includes park admission, a post-race party with complimentar..

The Bobcat Trail Race, taking place in Palmer Park, Colorado Springs, is a thrilling trail running event featuring multiple distances: 50K, 25K, 10K, and 5K. This race showcases the park's stunning landscapes, including rocky bluffs and panoramic views of the city and Pikes Peak. Originally a Mad Mo..

The Bridge Burner Ultra is an exciting running event taking place in Canon City, Colorado, featuring a scenic 35-mile loop and additional distances of 50k, 35k, and 10k. The race begins along the picturesque Arkansas River and includes a challenging ascent to 7,109 feet, offering breathtaking views..