Trail Running calendar near Windsor 2025-2026

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 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..

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 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 Pilot Hill 25K is Wyoming's oldest continuously run footrace, originating in the 1970s. This classic trail race features rugged terrain, including two-track and single-track trails, sandy flats, and limestone hills, culminating at the summit of Pilot Hill, offering stunning views of the surround..

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 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..

The Barr Lake Trail Race, held at Barr Lake State Park in Brighton, Colorado, is a popular running event featuring multiple distances: 50K, 30K, Half Marathon, 15K, and 5K. Celebrating its sixth year, the race showcases one of Colorado's flattest and fastest courses, with less than 100 feet of eleva..

Estes Park's Backyard Ultra is a unique ultra-running event set against the stunning backdrop of Lake Estes, Colorado. Participants must complete a 4.252-mile loop every hour until only one runner remains, who is declared the winner. This format creates an exciting challenge, as there is no predeter..

The Timberview Trail Run is a scenic trail running event held at Lory State Park in Colorado, featuring three race distances: 5K, 5 miles, and 10 miles. Scheduled for June 28, 2025, this event caters to athletes of all levels, including beginners and families, with a beginner-friendly 5K route. Part..

Chase the Moon is a unique 12-hour endurance running event held overnight in the scenic Highlands Ranch Backcountry trail system. Participants can choose to run solo or form teams of 3 or 5 for a relay. The race begins at sunset and continues under the full moon, concluding at sunrise, offering brea..