Trail Running Calendar Colorado 2024-2025

The Quad Rock 50 and 25 mile trail races, organized by Gnar Runners, will take place in Lory State Park and Horsetooth Mountain Park near Fort Collins, Colorado. This event offers participants a challenging course with stunning views of the Rocky Mountains and the Great Plains. The 50-mile race feat..

The Valkyrie Trail Race is a women-only trail and ultra running event set in the scenic Cheyenne Mountain State Park in Colorado Springs. Participants can choose from various distances, including 50K, Marathon, 30K, Half Marathon, 8 Miler, and 4 Miler, making it accessible for runners of all levels...

Adventure Fest at 18 Road is an exciting annual event celebrating the vibrant adventure community in Fruita, Colorado. This festival features a variety of competitive races, including the Fruita Trail Half, Sarlacc Attack 50K, and Zippity 22K mountain bike race, alongside The Dirty Edge Gravel. Part..

The Fruita Trail Half Marathon is an exhilarating 13.8-mile race set in the stunning desert landscape of Fruita, Colorado. Scheduled for May 11, 2025, this event features a scenic loop course with challenging climbs and descents, offering breathtaking views of the surrounding buttes and mesas. As pa..

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, hosted by the Human Potential Running Series, takes place at Mueller State Park and features a variety of events including a 10k, Half Marathon, 12-Hour, and 24-Hour races. The unique 12-Hour event allows participants to choose their loops based on colored balls drawn from a b..

The Ram Party Trail Runs, scheduled for May 17, 2025, in Colorado Springs, CO, offers a variety of race distances including 55 Mile, 60K, 50K, 24K, and 15K. Set against the stunning backdrop of Rampart Reservoir and Pikes Peak, participants can enjoy breathtaking views while challenging themselves o..

The Sky Pilots Ouray Backyard Ultra is a unique running event taking place in Ouray, Colorado. Participants tackle a 4.167-mile course, with the challenge of completing each lap within an hour to continue racing. The event continues until only one runner remains, who must finish one more lap than th..

The Mt Sopris Run-Off is an exciting running event taking place in Carbondale, CO, featuring two race distances: a 10-Mile and a 25k. Scheduled for May 18, 2025, this race will showcase the stunning "Up & Over" single track trail, starting at Flying Dog Ranch and finishing at Rock Bottom Ranch in Ba..

The Weld Your Mettle Running Festival is a vibrant event taking place over a weekend in May 2025 in Eaton, Colorado. It features a variety of running challenges, including timed relays (3, 6, 9, 12, and 24 hours), a 7K Ruck, and a 1 Mile Kids Fun Run. Participants can enjoy camping options, includin..

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 Spirit Trail Race is an exciting running event held in Buena Vista, Colorado, during Memorial Day Weekend. Participants can choose from various race distances, including a marathon, half-marathon, and 9k. The race promotes community engagement by donating proceeds to local organizations such as ..

The North Fork 50 Mile/50K is an ultramarathon set in the picturesque Colorado mountains, just southwest of 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 dive..

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 Great Divide Ultra is a premier trail running event held in Divide, Colorado, featuring a variety of distances including 100 miles, 100k, 50k, and 25k. Set against the stunning backdrop of Mueller State Park, participants can enjoy smooth single and double-track trails amidst picturesque meadows..

The Broken Brain Backyard is a unique running event taking place in Craig, CO, aimed at raising funds for Parkinson’s, ALS, and Alzheimer’s research. Participants can choose between the Backyard Ultra, where competitors run a 4.167-mile loop every hour until only one remains, or the more relaxed Cit..

Mace’s Hideout 100 is a challenging and scenic ultra-running event set in the stunning Wet Mountains of Colorado. Participants can choose between a 100-mile race and a 50-mile option, with only 75 spots available for each distance. The course features diverse ecosystems, transitioning from lush, wet..

The Garden of the Gods Ten Mile Run® is a premier running event in Colorado Springs, featuring a challenging 10-mile and 10K course that winds through the stunning sandstone rock formations of Garden of the Gods Park. Celebrated for over 46 years, this race attracts participants from across the Unit..

The Howelsen Hill Trail Run is an exciting trail running event set in the scenic surroundings of Howelsen Hill in Steamboat Springs, Colorado. Scheduled for June 14, 2025, participants can choose between two challenging distances: an 8-mile and a 4-mile run. The event showcases the beautiful trails ..

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 ..