Rocky's Backyard Ultra

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 a multi-day ultra-running festival in Loveland, Colorado, centered at Centennial Park and the River’s Edge Natural Area. Event distances range from 200-mile to 50k, plus timed formats up to 100+ hours, with a 200-runner cap. The flat, fast 2-mile loop traverses mostly dirt..

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..

American Heroes Run takes place in Longmont, Colorado, on a flat, fast loop course of about 1.05 miles. The event features multiple distances, including a 100-mile race (with a 30-hour cutoff), a 24-hour option, marathon, half-marathon, 9.11-mile, and 5K, plus shorter time-limited runs. The atmosphe..

Black Squirrel Half Marathon is a trail race set on the Lory State Park trails, northwest of Fort Collins in Bellvue, Colorado. The half marathon courses a 13.5-mile loop around the park, starting and finishing at Soldier Canyon, with roughly 2,000 feet of total climb and descent. The route includes..

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..