Trail Running calendar near Fort Collins 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 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 held 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, both solo and in relay formats. The ev..

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 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 that showcase the stunning landscapes..

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 Crazy Legs 10k+ Trail Run is set to take place at Devil’s Backbone Open Space in Loveland, Colorado, on June 1, 2025. This event features a challenging trail course marked by flour arrows, with a water stop available for participants. Runners will receive a unique hat and will be timed using a t..

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, taking place in Brighton, Colorado, is a celebrated running event now in its sixth year. It features one of Colorado's flattest and fastest courses, with minimal elevation gain, making it ideal for both seasoned runners and newcomers. Participants can choose from various di..

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 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 an exciting 12-hour endurance running event taking place in the Highlands Ranch Backcountry trail system. Participants can choose to run solo or form teams of three or five for a relay. The race begins at sunset and continues through the night, illuminated by the full moon, offerin..

The Never Summer 100km and 60km races will take place from July 25-27, 2025, in the stunning landscapes of State Forest State Park, Colorado. Participants can choose between a challenging 100km course with approximately 14,450 feet of elevation gain or a 60km option with around 8,850 feet of elevati..

The Boulder Rez Marathon is a scenic running event held at the Boulder Reservoir in Boulder, Colorado. Scheduled for August 2, 2025, the marathon features a flat course primarily on dirt roads and trails, offering stunning views of the reservoir and the Rocky Mountains. Participants can choose from ..

The Lory Summer Trail Series, taking place from August 5 to August 26, 2025, offers a series of midweek trail races at Lory State Park in Fort Collins, Colorado. Participants can choose from distances of 5K, 10K, and 12K, designed to cater to both novice and experienced trail runners. The event aims..

The Eltuck Valley 5K is part of a series of midweek trail races held at Lory State Park in Bellvue, Colorado. Scheduled for August 5, 2025, this event is designed to cater to both novice and experienced trail runners, offering a flat and fast course with a modest elevation gain. Participants can enj..