Trail Running calendar near Aurora 2024-2025

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 taking place on June 7-8, 2025, in Divide, Colorado. This festival features a variety of race distances, including 100-mile, 100K, 50K, and 25K options, all set against the stunning backdrop of Mueller State Park. The course consists of smooth ..

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 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 Timberview Trail Run is an exciting annual event held at Lory State Park in Colorado, featuring three race distances: a 10-mile, a 5-mile, and a 5K trail run. Scheduled for June 28, 2025, this event welcomes participants of all ages and skill levels, making it ideal for beginners and seasoned ru..

The Alma Foundation Race in the Clouds Dirt Festival, taking place in Alma, Colorado, offers a thrilling weekend of outdoor activities from July 10 to July 13, 2025. Participants can enjoy a variety of events, including mountain bike races, trail running, a free kids' bike race, and an off-road duat..

Chase the Moon is an exciting 12-hour endurance running event held 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 takes place overnight, starting at sunset and continuing under the full moon, offering stunning..

The Silverheels Trail Runs, part of the Human Potential Running Series, is an annual event taking place in Como, Colorado, featuring a variety of challenging distances including 10-Mile, 19-Mile, 60k, 50-Mile, 100k, and 100-Mile races. Set at an average elevation of over 10,000 feet, the course offe..

The Pikes Peak Ultra is an exciting running event designed to highlight the stunning trails of Colorado Springs. Participants can choose from various distances, including 20K, 30K, 50K, and 50 miles, with the course starting at Bear Creek Regional Park. Runners will traverse scenic routes, including..

The Summit 200 is an extraordinary 200-mile mountain race set in Summit County, Colorado, featuring a challenging loop that showcases stunning hiking trails, forest roads, and scenic views. Participants will experience significant elevation changes, with the lowest point over 9,000 feet and sections..

The Sheep Mountain Ultras, part of the Human Potential Running Series, is an annual trail running event held in Fairplay, Colorado. Scheduled for August 2, 2025, it features three race distances: a challenging 50-mile, a 50k, and a half marathon, all set against the stunning backdrop of the South Pa..

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 will take place in Bellvue from Tuesday 5 August 2025 to Monday 25 August 2025. You can run between 5 and 12 kilometers.

The Eltuck Valley 5K is a part of a fun summer trail race series held at Lory State Park in Bellvue, Colorado. This event is designed for both novice and experienced runners, offering a flat and fast course that serves as the first race in the series. Participants can enjoy a friendly atmosphere, wi..

The Holy COW Trail Stampede is an exciting running event held in Westminster, Colorado, featuring a 10-mile race and 5K/10K options. Participants can enjoy a fun and festive atmosphere while supporting the charity partner, Growing Home, which focuses on breaking the cycle of poverty for families in ..

The Into the Hills Eltuck 10K is part of a series of midweek trail races held at Lory State Park in Bellvue, Colorado. Scheduled for August 12, 2025, this race is known for its challenging terrain, featuring a significant elevation gain of 1,700 feet. The event aims to provide a welcoming atmosphere..

The Into the Hills Eltuck 5K is part of a series of midweek trail races held at Lory State Park in Bellvue, Colorado. Scheduled for August 19, 2025, this event features a challenging course with a steep climb and descent, making it suitable for both novice and experienced trail runners. Participants..

The Westminster Night Trail, celebrating its 12th year, invites runners to experience a unique nighttime race around Standley Lake in Westminster, CO. Participants can choose from various distances, including 50K, 35K, Half Marathon, 10K, and 5K, all set against the stunning backdrop of Colorado's n..