Trail Running Calendar Colorado 2024-2025

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 Box Canyon Trail Races, set in the scenic high country of Telluride, Colorado, features two challenging events: the Bridal Veil 30K and the Bear Creek 10 Mile. Participants will experience breathtaking views as they navigate varied terrain, including alpine meadows and steep ascents. The 30K rac..

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 above 9,000 feet and section..

The Boulder Rez Marathon is a scenic running event held at the Boulder Reservoir in Boulder, Colorado. Participants can choose from various distances, including a marathon, half marathon, 3/4 marathon, and 10K, all set along dirt roads and trails with stunning views of the reservoir and Rocky Mounta..

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 TransRockies Run is an exhilarating six-day stage race set in the stunning Colorado Rockies, covering a total distance of 120 miles. Scheduled for August 4-9, 2025, this event promises an unforgettable adventure for participants, fostering a unique community spirit among runners. The race is des..

The Lory Summer Trail Series, hosted by Gnar Runners, features a series of midweek trail races in August 2025 at Lory State Park, 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 to crea..

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 High Five 100 is an ultra-running challenge held in Lake City, CO, designed for elite runners seeking a rigorous test of endurance. Participants must navigate a course that includes 22 designated locations, consisting of 6 checkpoints and 16 proof points, with the goal of returning to Lake City ..

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 San Juan Softie 100 is a challenging 100-mile ultra marathon set in the stunning San Juan mountains of southwest Colorado. Participants will navigate an average elevation of nearly 10,000 feet, with a total ascent of over 20,000 feet, making it a true test of endurance and skill. The event empha..

The Leadville Trail 100 Mile Run, known as the "Race Across the Sky," is a prestigious ultramarathon held annually in Leadville, Colorado. Established in 1983, this grueling event challenges participants with a 100-mile out-and-back course that features extreme elevation changes, reaching a peak of ..

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 Telluride Mountain Run is a challenging and technical race set in the stunning San Juan Mountains near Telluride, Colorado. Participants can choose from three demanding routes: 40 miles, 24 miles, and 13 miles, navigating through old mining roads, singletrack trails, and alpine tundra. Runners w..

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..

The Staunton Rocks! Marathon and Half Marathon, scheduled for August 23, 2025, is a premier trail running event held in Staunton State Park, Colorado. Designed by trail runners for trail runners, the race features scenic singletrack trails that showcase the park's natural beauty, including historic ..

The Continental Divide Trail Run, taking place in Steamboat Springs, Colorado, features three trail race distances: 5 Mile, 16 Mile, and 50K. Set against the stunning backdrop of aspen and pine forests, participants will experience significant elevation gains, with the 50K boasting approximately 5,5..

The Rio Grande 100 will take place in South Fork on Saturday 23 August 2025.

The Front Range Ultra Dayze is an exciting ultra-running event taking place in Loveland, Colorado, from August 28 to September 1, 2025. This festival features a variety of ultra-distance races, including 200-mile, 100-mile, and timed events ranging from 12 to 100 hours. Participants can camp at the ..