Trail Running Calendar Colorado 2026-2027

A 24-hour loop endurance run on a 0.82 mile course atop the Palmer Divide at 7,240 feet. Prizes are awarded by distance and the first ten runners to reach 100 miles receive a buckle; a portion of registration fees supports local parks.

The Estes Epic returns to Colorado's mountains with trail runs and a mountain bike race. Choose from a 50k run, a heavy half marathon, a 50k bike race, or the ultimate "Epic" double. The event supports the local high school mountain bike te..

A roughly 13 mile mostly singletrack half marathon in Telluride, Colorado on September 26, 2026, running from Last Dollar Road through aspen woods back to town with a five hour cutoff and organized packet pick up options.

Run through Colorado history in the shadow of the Spanish Peaks. Choose from a 50K, heavy half marathon, or 8-mile trail course finishing at a festival with local beer and music. This event celebrates the local October Fest in La Veta and C..

This bucket-list half marathon runs from Snowmass to downtown Aspen on the scenic Government Trail. It sells out quickly, with registration opening each May for the late September race.

A trail race at Hartman Rocks near Gunnison, Colorado, offering 50K, 28K and 15K options on slickrock, singletrack and doubletrack. The course features rolling hills, a high desert climate, and wide mountain views.

The Bear Chase Trail Race is a two-day endurance festival in Colorado's Bear Creek Lake Park. On Saturday, runners can tackle ultra distances from 50K to 100K, while Sunday features shorter races like a half marathon, 10K, and 5K. The cours..

Explore the scenic HRCA Backcountry Wilderness Area on this autumn trail race near Wildcat Mountain. Choose between a 10-mile or 10K course on rolling dirt trails. The event includes a kids' race and features a pancake breakfast and post-ra..

The West Elk Challenge is a point-to-point trail marathon and 30K through Colorado's North Fork Valley at peak fall colors. Runners climb to Inter-Ocean Pass on a course of gravel roads and singletrack. All proceeds fund summer camp scholar..

Run the scenic trails and roads near the iconic Royal Gorge Bridge. Choose from a 5K road run, an 8-mile trail run, or a challenging half marathon on October 3, 2026. Both trail races are limited to 200 runners each.

The Emerald Mountain Trail Run offers two scenic distances on the aspen-lined trails of Emerald Mountain in Steamboat Springs. The event concludes the SSRS running series and raises funds for the Boys & Girls Club. Hikers are welcome on the..

A Halloween-themed 5K run or walk in Aspen that benefits the local animal shelter. Bring your pet in costume for a chance to win prizes. The timed race offers cash prizes for top finishers and includes festive activities.

A classic four-race trail series in Colorado Springs parks, with distances growing each week from 3.8 to 7.4 miles. Awards celebrate those who complete the entire cross-country challenge. The long-running event enforces strict safety rules..

A multi-distance trail event at Indian Creek Campground near Sedalia, Colorado, featuring single-track routes through montane forests, aspens and red rock views, with 5-Mile, 15-Mile, 55k and 50-Mile options and limited entry.

A trail race series in Palmer Park, Colorado Springs offering 50K, 25K, 10K and 5K courses across rocky single track with city and Pikes Peak views. Mandatory reusable cup and offline GPX recommended; crews allowed at start and finish.

This October trail event near Fort Collins features a marathon and a half marathon on the scenic Blue Sky Trail. Run mostly on singletrack through the Front Range hogbacks, the races offer generous time cut-offs. A post-race meal, t-shirt,..

Run on scenic trails at Bear Creek Lake Park with views of Denver. Choose between a 5-mile loop or a two-lap 10-mile challenge. Your entry includes park admission, a t-shirt, and a finish line celebration with food and drinks.

A classic four-race trail series in Colorado Springs parks, with distances growing each week from 3.8 to 7.4 miles. Awards celebrate those who complete the entire cross-country challenge. The long-running event enforces strict safety rules..

Methodist Mountain Ultra The Methodist Mountain Ultra (MMU) is a trail race set on the Methodist Mountain trail system near Salida, Colorado. It takes place at the northern end of the Sangre de Cristo mountains. The event features two dista..

Trail races at Bear Creek Lake Park offering 5 km, 15 km, a 5 km plus 15 km double, and a Kids 1 km. Main race registration includes socks or a neck gaiter and a pancake breakfast while kids receive a stuffy at the finish.