The Great Trailhead Foot Race 10 Miler

The Far Out 3/4 Marathon is a trail running event taking place at Chatfield State Park in Colorado. Organized by the Roxborough Running Club, this event offers participants the opportunity to challenge themselves in a scenic outdoor setting. Alongside the 3/4 marathon, runners can also choose to com..

The Rock Hawk Trail Races, scheduled for April 19, 2025, in Castle Rock, Colorado, offers a thrilling experience for both novice and experienced trail runners. Participants can choose from four distances: 50K, 25K, 10K, and 5K, all set against the stunning backdrop of Miller Park and Ridgeline Trail..

Niwot's Challenge is a challenging ultramarathon held annually in Colorado's Front Range, designed for experienced runners. Modeled after the Barkley Marathons, this grassroots event features a secretive course that requires participants to navigate primarily off-trail using a map and compass. With..

The Mountain Ridge Trail Race, taking place on May 10, 2025, in Highlands Ranch, Colorado, offers a variety of distance options for trail running enthusiasts, including a 21-mile, half marathon, 10K, and 5K. The event features scenic dirt and single-track trails with manageable elevation gains, prov..

The Ol' College Try 24 Hour Ultra is Denver's inaugural 24-hour ultra race, organized by Rise Again Running Events in collaboration with Tall Tales Ranch. Scheduled for May 24-25, 2025, at Auraria Campus, this event invites runners of all abilities to challenge themselves and achieve personal bests..

The Reuter-Hess Trail Run is a unique running event held in Parker, Colorado, featuring a challenging 10k course and a 1-mile kids' race. The race is designed with staggered starts based on age and gender, allowing participants of all ages a fair chance to compete. The course includes a mix of smoot..