Trail Running calendar near Severance 2025-2026

NedNed Trail Fest takes place in Nederland, Colorado, at 151 East Street, in the heart of Old Town. The event offers a trail Half Marathon (13.3 miles) with about 1,408 feet of elevation gain, a 10K (6.3 miles) with 712 feet of gain, and a 5K road run that is family- and pet-friendly (dogs on leash..

Jelm Mountain Run, held near Jelm, Wyoming, offers a 10-mile out-and-back and a 50k (three laps of the same course). The route climbs from about 7,618 feet to the Infrared Observatory atop Jelm Mountain at over 9,600 feet, with more than 2,000 feet of total elevation gain, on improved jeep roads wit..

Snow Mountain Ranch Trail Race is a multi-distance trail running festival at the YMCA of the Rockies in Granby, Colorado. Participants can choose from 50K, 33K, Half Marathon, 10K, and 5K, all on dirt trails with high-altitude scenery, rolling hills, and expansive mountain views. The 50K and 33K are..

Demon Dash is a 5K running or walking event held in Arvada, Colorado, featuring a new dirt course at the NAAC for a fresh home and surface. It’s pitched as a fun, community-focused experience suitable for runners and walkers of all ages. This year, the race runs in conjunction with the Demons Invite..

The Frederick Pack Burro Race is an annual 10K event held in Frederick, Colorado, celebrating the town's Miners Day heritage. The race follows a scenic course starting downtown at Fifth and Oak Streets, heading north along a trail through a tunnel to the Frederick Recreation Area, looping around Mil..

The Red Feather Trail Jamboree is a three‑day trail running weekend in the Red Feather Lakes region of Northern Colorado, starting on private land at the Ben Delatour Scout Camp. It offers three main distances—50 miles (about 8,500 ft of gain), 50K (about 4,200 ft), and a Half Marathon (about 1,700..

Estes Epic is a multi-event trail challenge held in Estes Park, Colorado. The weekend features a 50k bike race, a 50k trail run, a Heavy Half Marathon, and the all-in Epic Double (50k MTB and 50k Run). After a six-year break, the race returns with remote, rugged terrain, single-track trails, steep c..

Rocky’s Backyard Ultra is held at the YMCA of the Rockies Estes Park Center in Estes Park, Colorado. Runners must complete 4.167 miles in under one hour each lap, with the field reduced to a single finisher as the race continues until no others remain. The course loops around the boundary of RMNP on..

The Bear Chase Race Endurance Festival unfolds at Bear Creek Lake Park in Lakewood, Colorado, and offers six races: 100K, 50 Mile, 50K, Half Marathon, 10K, and 5K (with a Baby Bear 10K variant). The mostly dirt, single-track course is described as fast by trail standards and not overly technical, wi..

Boulder XC Series Meet 1 is a family-friendly cross-country event held at Valmont City Park (South) in Boulder, Colorado (5110 Valmont Rd). The meet offers three distances: 1K for younger runners, 3K for those up to 16, and a 5K open race, welcoming participants of all ages and abilities. It’s the f..

Indian Creek Trail Runs, the oldest official race in the Human Potential Running Series, is held at Indian Creek Campground in Sedalia, Colorado. The 12th annual Fall Classic offers four distances — 5-Mile, 15-Mile, 55k, and 50-Mile — with a combined cap of 225 runners. Runners traverse seldom-used..

The Blue Sky Trail Marathon & Half takes place October 18 (Marathon) and October 19 (Half), 2025, in Fort Collins, Colorado. The races run on trails between Horsetooth Mountain Park and the Devil’s Backbone Open Space along the easternmost hogbacks of the Front Range. Elevation on course ranges..

The Great Trailhead Foot Race takes place at Bear Creek Lake Park in Lakewood, Colorado, with 5- and 10-mile trail options. Runners tackle single-track and dirt trails in the shadow of Denver's skyline, with the 10-mile course as a double lap to the finish line party. Start and finish are at the Pel..

Beware The Bear Trail Races take place at Bear Creek Lake Park in Lakewood, Colorado. Organizers offer four options: a 5K, a 15K, a 5K+15K Double, and a Kids 1K. The mostly dirt courses feature single and double-track trails with short, steep climbs, rollers, and mixed terrain designed as a friendly..

Colorado 24 Hour Run takes place in Fort Collins, Colorado, at 4927 E. County Road 36. The event offers multiple distance options: 24-hour, 12-hour, and 6-hour races, plus 24-hour, 12-hour, and 6-hour relays.Runners complete laps on a one-mile dirt loop—the flat, scenic loop you’ll find in Colorado—..

The Colleen De Reuck XC Classic is a cross country running event held annually at Harlow Platts Community Park in Boulder, Colorado. Honoring renowned distance runner Colleen De Reuck, the race promotes health, fitness, and celebrates local Olympians, with 2025 honoring 2012 Olympic marathoner Yoshi..

The HRCA Backcountry Wilderness Half Marathon is an annual 13.1-mile trail race held in Highlands Ranch, Colorado, featuring a scenic single-loop course through the Douglas County East/West trail and the Backcountry Wilderness Area. The race offers a challenging route on dirt, gravel, and singletrac..

Bingo! Trail Party, hosted by the Human Potential Running Series, takes place at May Farms in Byers, Colorado. It features five levels: Level 1 (6–10 miles), Level 2 (8–20 miles), Level 3 (10–42 miles), Level 4 (10–54 miles), and Level 5 (18–54 miles), with a 9 PM time limit and a 300-runner cap. Th..

Louisville Trail Race in Louisville, Colorado returns for its 12th year, offering a Half Marathon, 10K, and 5K on scenic trails around Louisville and the Flat Irons. The mostly dirt courses pair gentle elevation with two longer climbs on the half, plus a shorter hill in the 10K and 5K, all out-and-b..

Thumbs Up Vertical Challenge takes place in Estes Park, Colorado, on December 6, 2025. The race uses the Thumb Open Space trail, a 2km out-and-back course with 540 feet of vertical gain per lap. The route is 100% single-track with switchbacks, steps and steep rocks, offering views of Longs Peak, Mou..