Black Squirrel Half

Red Feather Trail Jamboree is a three-day trail running weekend held near Red Feather Lakes, Colorado, starting from the Ben Delatour Scout Ranch. Runners can tackle three distances: 50 miles (≈8,500 ft of gain), 50K (≈4,200 ft), and a Half Marathon (≈1,700 ft), with a 3-day Challenge totaling about..

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..

Blue Sky Trail Marathon & Half takes place in Fort Collins, Colorado, on trails between Horsetooth Mountain Park and the Devil’s Backbone Open Space. The event offers a 26.7-mile Marathon with about 3,500 feet of elevation gain/loss, and a 13.4-mile Half Marathon with about 1,800 feet. The course is..

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..

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..