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Trail Running Calendar Colorado 2024-2025

Welcome to Colorado's premier trail running calendar for 2024-2025! Recognized as a trail runner's haven, Colorado seamlessly blends bustling urban settings with pristine mountain terrains. Whether you're a native, a newbie, or a visitor exploring the Centennial State's running trails, our calendar ensures you don't miss out on any event.

Denver, the renowned Mile High City, beckons runners with its urban-meets-nature charm. Iconic routes like the Cherry Creek Trail zigzag right through the city's pulse. Venturing south, Colorado Springs, dubbed the "Olympic City", boasts of trails skirting the monumental Garden of the Gods. Here, a run transcends the ordinary, offering an experience akin to striking gold.

For those seeking a quiet escape, Aurora presents peaceful reservoir paths, making urban detox achievable. If the allure of academic vibes mixed with nature captivates you, Fort Collins and its famous Horsetooth Reservoir trails won't disappoint. Meanwhile, Lakewood introduces runners to nature's canvas with the Red Rocks painting every run. And let's not forget Boulder, offering a diverse range of trails set against the stunning backdrop of the Flatirons.

Rim to Rim Royal Gorge Races

Cañon City

The Rim to Rim Royal Gorge Races feature a variety of running events, including a 5K road run, an 8-mile trail run, and a half marathon trail run, all set against the stunning backdrop of the Royal Gorge Bridge. Participants can enjoy challenging terrains, scenic views, and the thrill of crossing th..

Rocky's Backyard Ultra

Estes Park

Rocky's Backyard Ultra is an exciting ultra trail running event held in Estes Park, Colorado, at the YMCA of the Rockies. This unique race format challenges participants to complete 4.167 miles every hour until only one runner remains. The course features stunning Rocky Mountain scenery, with approx..

Castle Rock Trail Festival

Castle Rock

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The Castle Rock Trail Festival is an exciting athletic event that caters to a wide range of participants, from ultra-distance runners to families with children aged 5 to 12. Set against the stunning backdrop of Philip S. Miller Park and Ridgeline Open Space, the festival features various race option..

The Great Trailhead Foot Race 10 Miler

Lakewood

The Great Trailhead Foot Race 10 Miler is an exciting running event held at Bear Creek Lake Park in Lakewood, Colorado. Participants can enjoy a scenic 10-mile course featuring single-track and dirt trails, all while taking in views of Denver's skyline. The event includes a post-race celebration wit..

Blue Sky Trail Marathon

Fort Collins

The Blue Sky Trail Marathon and Half Marathon will take place on October 18-19, 2025, in Fort Collins, Colorado. This event features a challenging 26.7-mile marathon and a 13.1-mile half marathon, both set against the stunning backdrop of the Colorado Rockies. The courses traverse a mix of dirt sing..

Indian Creek Trail Runs

Sedalia

The Indian Creek Trail Runs, part of the Human Potential Running Series, is a celebrated annual event known as the "Fall Classic." Scheduled for October 18, 2025, it features multiple race distances including 50-Mile, 55k, 15-Mile, and 5-Mile options. Set in the picturesque Indian Creek Campground n..

November 2025

Kessel Run Ultra

Fruita

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The Kessel Run Ultra is an exciting ultra-running event taking place in Fruita, Colorado, featuring a variety of race distances including 50 Miler, 40 Miler, 50k, 20 Miler, and 10 Miler. Set against the stunning backdrop of the Western Slope, the course offers a mix of smooth and technical singletra..

Bingo! Trail Party

Byers

The BINGO! Trail Party is a unique running event organized by the Human Potential Running Series, set to take place at May Farms in Byers, Colorado. This event encourages runners of all abilities to participate in a fun and community-oriented atmosphere. Participants run loops on a scenic course unt..

Louisville Trail Race

Louisville

The Louisville Trail Race, celebrating its 12th year, features a Half Marathon, 10K, and 5K, set against the stunning backdrop of Louisville, Colorado. Known for its scenic trails and welcoming atmosphere, the race offers a mostly flat course with a challenging hill that rewards runners with breatht..

December 2025

Sawmill Trail Runs

Pine

The Sawmill Trail Runs is an annual trail running event held at Staunton State Park in Pine, Colorado. Established in 2013 and officially recognized since 2017, the event features three distance options: a 50k, a 16-mile, and an 8-mile race. With a runner capacity of 250, the event emphasizes commun..