Trail Running calendar near Fort Collins 2025-2026

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 Med Bow Rail Marathon and Half Marathon, hosted by the Friends of the Medicine Bow Rail Trail, will take place on August 9, 2025. This event features a marathon course that spans the scenic Medicine Bow Rail Trail, averaging an elevation of 8,926 feet, and briefly crosses into Colorado. The half..

Dirt Circus - Boulder is a vibrant community running event scheduled for August 9, 2025, in Boulder, Colorado. Organized by UltraSignup, this festival celebrates local races, running clubs, and businesses, fostering camaraderie among trail running enthusiasts. Participants can enjoy a social run wit..

The Into the Hills Eltuck 10K is part of a fun summer trail race series held at Lory State Park in Bellvue, Colorado. Scheduled for August 12, 2025, this event features a challenging 10K course with a significant elevation gain of 1,700 feet, making it the hilliest race in the series. The series aim..

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 NoCo Urban Ultra & Relay is a long-distance running event taking place on August 22-23, 2025, along the scenic Poudre River Trail in Northern Colorado. Participants can choose from a 50-mile solo race, a 100-mile solo race, or relay options for both distances. This inaugural event, organized by ..

The Staunton Rocks! Marathon and Half Marathon, scheduled for August 23, 2025, is a trail running event set in the picturesque Staunton State Park in Colorado's Front Range Mountains. Participants can choose between a full marathon (26.3 miles) and a half marathon (13.1 miles), both featuring scenic..

The Westminster Night Trail, celebrating its 12th year, invites runners to experience a thrilling night race around Standley Lake in Westminster, CO. This event features various distances, including 50K, 35K, Half Marathon, 10K, and 5K, all set on a mix of packed dirt trails and single-track paths. ..

The Eltuck Valley 12K is part of the Lory Summer Trail Series, taking place at Lory State Park in Bellvue, Colorado. This event is designed for both novice and experienced trail runners, offering a fun and low-key atmosphere. The series includes four races, with distances ranging from 5K to 12K, all..

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 for fre..

The American Heroes Run is a commemorative running event held in Longmont, Colorado, designed to honor the heroes of 9/11 and promote patriotism. Participants can choose from various race distances, including a 100-mile run, marathon, half-marathon, 9.11-mile run, and a 5K. The event features a scen..

Devil on the Divide is a challenging trail running event held in Empire, Colorado, featuring two race distances: a 50K and a 22K. Participants will experience breathtaking views of Clear Creek County and the Continental Divide, with the 50K course reaching altitudes over 13,000 feet and climbing mor..

The HRCA Wildcat Mountain Trail Races, scheduled for September 6, 2025, in Littleton, Colorado, features a variety of events including a 10-mile race, a 10K, and a Kid's Race. The races start at the Douglas County East/West trailhead and traverse the scenic HRCA Backcountry Wilderness Area. Particip..

The Black Squirrel Half Marathon, scheduled for September 6, 2025, takes place in Lory State Park, Bellvue, Colorado. This challenging 13.5-mile race features approximately 2,000 feet of elevation gain and descent, offering stunning views of Horsetooth Reservoir and the Rocky Mountains. The course i..

The Snow Mountain Ranch Trail Running Festival, taking place in Granby, Colorado, offers a stunning backdrop for runners of all levels. Participants can choose from various race distances, including a 50K, 33K, Half Marathon, 10K, and 5K, all set against the picturesque scenery of rolling hills and ..

The Red Feather Trail Jamboree is a three-day trail running event scheduled for September 26-28, 2025, in the scenic Red Feather Lakes region of Northern Colorado. Organized by trail runners for trail runners, the event features multiple race distances, including a 50-mile, 50K, and half marathon, a..

The Bear Chase Race is an exciting endurance festival held at Bear Creek Lake Park in Lakewood, Colorado, featuring a variety of race distances including 100K, 50 Mile, 50K, Half Marathon, 10K, and 5K. Scheduled for September 27-28, 2025, this event is ideal for both novice and experienced trail run..

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 requires participants to complete a 4.167-mile loop every hour until only one runner remains. The course features stunning Rocky Mountain scenery, with ap..

The Great Trailhead Foot Race features both a 10-mile and a 5-mile race set in Bear Creek Lake Park, Lakewood, CO. Participants can enjoy scenic trails while racing, with amenities including free food and beverages post-race, such as hot dogs and non-alcoholic beer. Each runner receives a gender-spe..

The Blue Sky Trail Marathon and Half Marathon will take place on October 18-19, 2025, in Fort Collins, Colorado. This event features a marathon distance of 26.7 miles with an elevation gain of 3,500 feet, and a half marathon distance of 13.4 miles with an elevation gain of 1,800 feet. The courses tr..