Trail Running calendar near Jackson County 2025-2026

Run Rabbit Run, in Steamboat Springs, Colorado, offers two ultramarathons—the 50‑mile and 100‑mile—welcoming both “Tortoises” and “Hares.” Runners traverse the scenic Routt National Forest amid autumn colors, with the 100‑mile route looping from the base to Mount Werner, across the Continental Divid..

Nestled in Old Town Nederland, Colorado (elevation around 8,236'), NedNed Trail Fest offers a long-running trail challenge with three race options: a Half Marathon (about 13.3 miles with roughly 1,408 feet of elevation gain on dirt roads and single-track trails), a 10K (about 6.3 miles on dirt roads..

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..

Red Feather Trail Jamboree is a three-day trail running weekend near Red Feather Lakes, Colorado, hosted at the Ben Delatour Scout Ranch and surrounding National Forest. The event features three main races: 50-mile (≈8,500 ft gain), 50K (≈4,200 ft gain), and Half Marathon (≈1,700 ft gain), plus a 3-..

The Emerald Mountain Trail Run takes place in Steamboat Springs, Colorado, offering two race distances: a 12k (approximately 7.75 miles) and a 4-mile run. The scenic course starts at the base of Howelsen Hill and winds through aspen-lined single-track trails on Emerald Mountain. The event welcomes h..

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..

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..

Blue Sky Trail Marathon & Half takes place in Fort Collins, Colorado, on the trails between Horsetooth Mountain Park and the Devil’s Backbone Open Space. Runners choose between the Blue Sky Marathon (26.7 miles with about 3,500 feet of elevation gain/loss) and the Blue Sky Half (13.4 miles with abou..

Hosted in Fort Collins, Colorado, the Colorado 24 Hour Run offers 24-hour, 12-hour, and 6-hour events, including relays, on a single 1-mile dirt loop. The course is described as Colorado’s most scenic flat dirt loop—fully supported and easy on feet and eyes. Runners can tackle distances individually..

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..

Louisville Trail Race in Louisville, Colorado offers Half Marathon (13.1 miles), 10K (6.2 miles), and 5K (3.1 miles) on mostly dirt trails through the Front Range backdrop near the Flat Irons. The mostly flat to gently rolling course features two notable climbs and panoramic views of the Front Range..

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..

The USCSA Cross Country Ski Racing Festival, hosted by Colorado Mesa University, takes place at Snow Mountain Ranch Nordic Center in Granby, Colorado. Scheduled for January 24-25, 2026, this event features collegiate and junior racers competing in classic and skate sprint races. Distances include 15..

Race The Ranch is a winter snowshoe race held in Granby, Colorado on the Snow Mountain Ranch YMCA property. It offers three distances: 5k (1 lap), 25k (2 laps), and 50k (4 laps), designed to accommodate runners of all levels. The course combines singletrack, doubletrack, and groomed snowshoe trails,..

Run the Ranch is an annual trail running event held at the scenic Sylvan Dale Guest Ranch in Loveland, Colorado. The race offers a variety of distances including 5K, 10K, and timed trail runs of 4, 6, and 12 hours, with options for solo runners and 4-person relay teams. Participants run on private r..

The Great Western Trail Race, held in Severance, Colorado, offers a variety of running events including a 5K, 10K, half marathon, and a Kids Fun Run. Scheduled for April 18, 2026, this race welcomes participants to enjoy spring racing in a scenic community park setting. The event features chip timin..

Summits Trail Runs, the 2nd Annual edition of the Human Potential Running Series, unfolds at Granby Ranch Resort in Colorado’s Rocky Mountains (Granby, CO). The race weekend offers several distances: Elevation Challenge (a 32-hour ascent loop on East Peak), 50k, Marathon, Half Marathon, and 6 Miles,..

Crazy Legs 10k+ Trail Run is held at Devil’s Backbone Open Space in Loveland, Colorado, starting and finishing in the parking lot. The loop course runs through Hidden Valley, Hunter Loop, Laughing Horse Loop, and Wild Loop for roughly 10k+, with a low-key atmosphere. The route is flour-arrow marked..