Trail Running calendar near Brighton 2025-2026

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 Winter's End Snowshoe Races, hosted by the Human Potential Running Series, is an exciting winter running event taking place at Granby Ranch Resort in Granby, Colorado. Scheduled for March 8, 2025, the event features multiple race distances, including a 2-mile "Fun Run," an 8-mile, a 16-mile, and..

Lucky Lyons is a festive running event held in Lyons, Colorado, featuring 5K and 10K races to kick off St. Patrick's Day celebrations. Participants are encouraged to wear their best green attire as they navigate scenic courses that include paved, gravel, and dirt paths.The event supports the Lyons C..

Run The Ranch is an exciting trail running event taking place at Sylvan Dale Guest Ranch in Loveland, Colorado. Scheduled for April 4-5, 2025, participants can choose from various distances, including a 5K, 10K, and multiple timed trail runs ranging from 4 to 12 hours, with options for solo runners..

The Rattler Trail Race, taking place in Colorado Springs, features three race distances: 50K, 25K, and 10K. Set in the scenic Palmer Park, participants will experience breathtaking views of the city and Pikes Peak while navigating technical trails with unique rock formations. The course is designed..

The Great Western Trail Race, taking place in Severance, Colorado, offers a variety of running events including a 5K, 10K, half marathon, and a Kids Fun Run. Scheduled for April 19, 2025, this event celebrates Northern Colorado's newest trail, connecting Windsor, Severance, and Eaton. Participants c..

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..

The Greenland Trail Races, held annually in May at the Greenland Open Space in Larkspur, Colorado, features four race distances: 4 miles, 8 miles, 25K, and 50K. This event is known for its scenic trails with views of Pikes Peak, making it a popular choice for both novice and experienced runners. Par..

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 Quad Rock 50 and 25 Mile Trail Races, organized by Gnar Runners, will take place on May 10, 2025, in Lory State Park and Horsetooth Mountain Park, near Fort Collins, Colorado. This challenging event features two distances: a 50-mile race with over 11,000 feet of elevation gain and a 25-mile race..

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..

Samson's Revenge is a trail running event held at the YMCA of the Rockies in Estes Park, Colorado, honoring the legacy of Samson, a famous elk poached in 1995. Participants can choose from three race distances: 10K, 27K, and 55K, featuring a challenging course with significant elevation gain, partic..

The Endure Trail Runs, organized by the Human Potential Running Series, takes place at Mueller State Park in Divide, Colorado. This unique event features a variety of races, including a 10k, Half Marathon, and timed challenges of 12 and 24 hours. Participants in the 12-Hour and 24-Hour events will d..

The Weld Your Mettle Running Festival is a four-day event taking place in Eaton, Colorado, from May 23 to May 26, 2025. This festival features a variety of running events, including solo and relay formats ranging from 3 to 48 hours, as well as a 7K run and ruck. Participants can enjoy a unique exper..

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..

The North Fork 50 Mile/50K is an ultramarathon held in the scenic Colorado mountains near Denver. This event features a challenging course that is entirely on soft surfaces, primarily consisting of singletrack trails, with some sections of double track. Runners will experience diverse landscapes, in..

The Crazy Legs 10k+ Trail Run is an exciting running event taking place at Devil’s Backbone Open Space in Loveland, Colorado, on June 1, 2025. This trail run features a challenging course designed to provide a fun experience for participants. Runners will navigate through various trails, with water..

The Great Divide Ultra is a premier trail running event taking place on June 7-8, 2025, in Divide, Colorado. This festival features a variety of race distances, including 100-mile, 100K, 50K, and 25K options, all set against the stunning backdrop of Mueller State Park. Participants will enjoy smooth..

The Summits Trail Runs, part of the Human Potential Running Series, is an exciting trail running event set in the stunning Rocky Mountains at Granby Ranch Resort, Colorado. Scheduled for June 14, 2025, the event features multiple race distances, including a challenging 43-mile Quad, a 27-mile Triple..