Trail Running calendar near Longmont 2025-2026

The Big Brrrrito event offers participants the choice of running 5 miles, 10 miles, or 15 miles through the scenic trails of Chatfield State Park in Colorado. Organized by the Roxborough Running Club, this running event is set to take place on January 25, 2025. Registration for the event will close ..

The Running Up for Air - Staunton Rocks is an endurance running event taking place at Staunton State Park in Pine, Colorado, on February 14-15, 2025. Participants can choose from various challenges, including 3, 6, 12, and 24-hour races, running a marked 7.1-mile loop with significant elevation gain..

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. This event features various race distances, including a "Fun Run" 2-Mile, 8-Mile Snowshoe, 16-Mile Snowshoe, and a Marathon Snow..

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, celebrates the region's newest trail connecting Windsor, Severance, and Eaton. Participants can choose from various events, including a 5k, 10k, half marathon, and a Kids Fun Run. The race features a mostly flat and fast course with ..

The Rock Hawk Trail Races, part of the Bear Chase Race Series, take place on the scenic trails of Castle Rock’s Miller Park and Ridgeline Trail systems. Scheduled for April 19, 2025, this event features multiple race distances: 50K, 25K, 10K, and 5K, catering to both novice and experienced trail run..

The Greenland Trail Races, held annually in May at the Greenland Open Space in Larkspur, Colorado, features four race distances: 4 Mile, 8 Mile, 25K, and the 50K ultramarathon, which is recognized as Colorado's fastest 50K. Participants enjoy a scenic course with views of Pikes Peak, running on soft..

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 distances for trail running enthusiasts, including a 21-mile, half marathon, 10K, and 5K. Celebrating its 11th year, the race features scenic dirt and single-track trails with manageable el..

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..

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. The race features three distances: 10K, 27K, and 55K, with a challenging course that includes a significant ascent known as the King of the ..

The Weld Your Mettle Running Festival is a four-day event taking place in Eaton, Colorado, featuring a variety of running challenges suitable for all participants. Events include solo and relay formats ranging from 3 to 24 hours, as well as a 7K run and ruck. The festival offers a vibrant atmosphere..

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 North Fork 50 Mile/50K is an ultramarathon set in the scenic Colorado mountains near Denver, taking place on May 31, 2025. This event features a challenging course that is entirely on soft surfaces, primarily singletrack trails, with some double track sections. Runners will experience diverse la..

The Crazy Legs 10k+ Trail Run is an exciting running event taking place at Devil’s Backbone Open Space in Loveland, Colorado. Scheduled for June 1, 2025, this trail run features a challenging course marked by flour arrows, with water stops provided along the way. Participants can enjoy a unique expe..

The Summits Trail Runs, hosted at Granby Ranch Resort in Colorado, is an exciting trail running event featuring various distances, including ultra options. Participants can choose from the Quad (43 miles), Triple (27 miles), Double (21 miles), and Single (6 miles) runs, all set against the stunning ..

The Barr Lake Trail Race, taking place in Brighton, Colorado, is a celebrated running event now in its sixth year. It features a variety of race distances including 50K, 30K, half marathon, 15K, and 5K, all set on one of Colorado's flattest and fastest courses with minimal elevation gain. Runners wi..

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 emphasizes endurance and strategy, as there is no pred..

The Midsummer Night's Run is an exciting 10K event held in Winter Park, CO, featuring a scenic course that includes gravel roads and trails with an elevation gain of approximately 570 feet. This race is part of the Peak to Peak Summer Showdown Race Series, allowing participants to compete in multipl..