Trail Running calendar near Weld County 2025-2026

The Into the Hills Eltuck 5K is a midweek trail race held at Lory State Park in Bellvue, Colorado. Part of a summer trail series, this event features a challenging course with a steep, quick climb and descent along the Homestead, Well Gulch, and Kimmons loop, offering about 700 feet of elevation gai..

The NoCo Urban Ultra will take place in Weld County from Friday 22 August 2025 to Saturday 23 August 2025. You can run between 50 and 100 miles.

The Antelope Dash is a trail running event held at Curt Gowdy State Park near Cheyenne, Wyoming. It features 4-mile and 8-mile races that traverse rolling hills and winding trails through scenic forested areas of aspens and pines. The courses start at an elevation of 7,300 feet and climb to 7,700 fe..

The Westminster Night Trail in Westminster, Colorado, is a vibrant night trail running event held at Standley Lake. Celebrating its 12th year, it offers distances of 50K, 35K, half marathon, 10K, and 5K, all on 100% packed dirt trails featuring a mix of single-track and bike paths. Runners experienc..

The Bluffs 8K Trail Run is a challenging race held at Bluffs Regional Park in Lone Tree, Colorado. The course features rolling hills and beautiful views, with a mix of fine crushed gravel and some rugged, steep sections. The race starts and finishes near the Prairie Sky Park parking lot.Participants..

The Eltuck Valley 12K is part of the Lory Summer Trail Series held at Lory State Park in Bellvue, Colorado. This midweek trail race series offers a range of distances from 5K to 12K, catering to both new and experienced trail runners. The August 26 race features a fast and flat 12K course along the..

Front Range Ultra Dayze is an ultra-running festival held in Loveland, Colorado, featuring a variety of ultra-distance events including 50k, 100-mile, 200-mile, and timed races up to 100 hours. The course is a flat, fast 2-mile loop through Centennial Park and River’s Edge Natural Area, mostly on di..

The Calarat Challenge Trail Running Festival takes place in Jamestown, Colorado, at the Cal-Wood Education Center, a nonprofit dedicated to outdoor education. Held over Labor Day weekend, the event features multiple trail races including a half marathon, 10K, 5K, Kids 1K, and combination races like..

The American Heroes Run, held in Longmont, Colorado, is a patriotic running event commemorating the events of 9/11. It features a variety of distances including a 100-mile ultra with a 30-hour cutoff, a 24-hour run, marathon, half-marathon, 9.11-mile, and 5K races. The course is a flat, fast 1.05-mi..

The HRCA Wildcat Mountain Trail Races, held in Littleton, Colorado, offer a scenic and challenging trail running experience through the HRCA Backcountry Wilderness Area. Participants can choose from a 10-mile or 10-kilometer course, both featuring 100% dirt trails with varied terrain and stunning mo..

The Black Squirrel Half Marathon is a 13.5-mile trail race held in Lory State Park near Fort Collins, Colorado. Featuring approximately 2,000 feet of elevation gain and loss, the course offers a challenging yet accessible perimeter tour of the park with stunning views of Horsetooth Reservoir, Fort C..

The Ned Ned Half Marathon, held in Nederland, Colorado, is a celebrated trail running event with a 43-year tradition. The race features a challenging 13.3-mile course with 1,408 feet of elevation gain, winding through dirt roads and single-track mountain trails around Old Town Nederland, a quintesse..

The Frederick Pack Burro Race will take place in Frederick on Saturday 20 September 2025. You can run between 6 and 10 kilometers.

The Red Feather Trail Jamboree is a three-day trail running event held at Ben Delatour Scout Ranch in Red Feather Lakes, Colorado. Scheduled for September 26-28, 2025, it offers three race distances: a 50-mile ultra with 8,500 feet of elevation gain, a 50K with 4,200 feet gain, and a half marathon f..

The Bear Chase Race Endurance Festival is a trail running event held at Bear Creek Lake Park in Lakewood, Colorado. It offers multiple distances including 100K, 50 Mile, 50K, Half Marathon, 10K (Baby Bear), and 5K, catering especially to first-time ultramarathoners and trail runners. The course feat..

Rocky's Backyard Ultra is a unique ultra trail race held at the YMCA of the Rockies in Estes Park, Colorado, known as the highest organized Backyard Ultra in the world. Runners complete 4.167-mile laps on a challenging singletrack course featuring about 500 feet of elevation gain and loss per lap, w..

The Great Trailhead Foot Race 10 Miler takes place at Bear Creek Lake Park in Lakewood, Colorado, offering runners a scenic trail experience with single-track dirt paths against the backdrop of Denver’s skyline. Participants can choose between a 5-mile or a challenging 10-mile double-lap course. Reg..

The Blue Sky Trail Marathon & Half, held in October 2025 near Fort Collins, Colorado, offers challenging trail races through the scenic eastern hogbacks of Northern Colorado’s Front Range. The marathon covers 26.7 miles with 3,500 feet of elevation gain, while the half marathon spans 13.4 miles with..

Beware The Bear Trail Races take place at Bear Creek Lake Park in Lakewood, Colorado, offering 5km, 15km, and a combined 5+15km double race, along with a 1km kids' run. The courses feature mostly dirt trails with a mix of single and double tracks, incorporating short steep hills, rollers, and varied..

The Colorado 24 Hour Run will take place in Windsor from Saturday 1 November 2025 to Sunday 2 November 2025. You can run between 6 and 24 kilometers.