Trail Running calendar near Marble 2025-2026

Cirque Series returns to Arapahoe Basin, Colorado, for a high-alpine mountain race. On White River National Forest trails above Keystone, the course runs about 9 miles with roughly 2,411 feet of elevation gain, starting at Mountain Goat Plaza at the base of A-Basin. Racers ascend via summer road to..

The Ouray 50 Mile Endurance Run, held in Ouray, Colorado, is a challenging mountain ultramarathon featuring approximately 23,582 feet of elevation gain. Known for its technical and demanding trails, the course is set nearly two miles above sea level amidst stunning mountain scenery. The race is desi..

The Breckenridge Oktoberfest 5K is a festive trail run held in historic downtown Breckenridge, Colorado, as part of the annual Oktoberfest celebration. Scheduled for Saturday, September 13, 2025, the 5K course winds through the scenic Town of Breckenridge Trails, showcasing beautiful fall foliage an..

Trail Sisters Women's Half Marathon & 10k takes place in Buena Vista, Colorado, tucked in the Rocky Mountains along the Arkansas River. The events include a 13.1-mile trail half marathon and a 10k. The courses wind through sagebrush and ponderosa pines, rewarding runners with views of the Collegiate..

Lead King Loop 25K, 8M, and Kids Run take place in Marble, Colorado, in the Elk Mountains. The flagship 25K is a dirt-road course starting at Thompson Park, winding through Beaver Lake and Lead King Basin, climbing roughly 2,900 vertical feet over about four miles into high alpine terrain, then desc..

Ouray Mountain Trail Run takes place in Ouray, Colorado, on September 20, 2025, and covers 13 miles of mountainous terrain, starting and finishing at Fellin Park. A fundraiser for Ouray School, it’s hosted by PATT and the HS Outdoor Education Class to support student trips to Moab, Denver, Washingto..

Crested Butte Ultra, in Crested Butte, Colorado, features 50 Miler, 55K, and 35K formats. Runners traverse the Gunnison National Forest on single-track trails through mountain meadows and up to high ridges for wide-open vistas of wildflowers, mountain backdrops, and fall foliage. The event aims to f..

The West Line Winder is a scenic trail running event held in Buena Vista, Colorado, featuring two race distances: a 50K (30.6 miles) with 4,000 feet of ascent and a 30K (18.1 miles) with 2,080 feet of ascent. The courses traverse buttery singletrack trails, forest roads, and some paved sections, set..

The Golden Leaf Half Marathon is a scenic running event held annually in late September, starting at Fanny Hill in Snowmass and finishing at Koch Lumber Park in downtown Aspen, Colorado. The course follows the Government Trail, winding through beautiful Aspen groves, offering runners a picturesque a..

The Sawatch Ascent 50k is a challenging high-alpine trail race held in Nathrop, Colorado, showcasing the stunning Sawatch Range. Covering 33 miles with 7,000 feet of vertical gain, the course features a mix of 26 miles of singletrack, paved, and gravel roads, including 12 miles on the Colorado Trail..

14er Fest is a fall trail-running event in Buena Vista, Colorado, featuring two races: an 8.7-mile (14K) course and a 3.1-mile (5K) course. The 14K starts in Buena Vista River Park, crosses the Arkansas River, and climbs the Midland Hill Trail System for over 500 feet of elevation gain, offering pan..

Set in Colorado’s North Fork Valley, the West Elk Challenge is a 26.2‑mile point‑to‑point trail marathon through fall colors. The course starts at Crawford Reservoir State Park, travels past Needle Rock, then ascends into Gunnison National Forest on Mt. Lamborn’s slopes, topping Inter-Ocean Pass at..

Nestled in the Rocky Mountains, Sage Burner Trail Race takes place at Hartman Rocks Recreation Area in Gunnison, Colorado. Runners choose from 50K, 28K, and 15K distances through sagebrush hills, technical slickrock, smooth singletrack and fast doubletrack. The course features rolling hills and punc..

Rubey Rescue Run is a 5K uphill trail race held in Aspen, Colorado. The course climbs Buttermilk Mountain, starting near the base at Buttermilk Mountain Lodge and gaining about 1,700 feet to the Cliff House, offering a timed competition and sweeping views of the Maroon Bells. Participants may run wi..

Gothic Mountain Tour takes place in Crested Butte, Colorado. It features two ski races: a 23.5-mile competitive course and a 17.85-mile recreational route around Gothic Mountain, finishing on the Crested Butte Nordic trail system at the Magic Meadows Yurt. The course begins in Crested Butte (competi..

The 21st Annual Run Through Time Trail Marathon and Half Marathon takes place in Salida, Colorado. It offers a Trail Marathon, a Trail Half Marathon, and a 2 Mile Run, plus a free kids’ 400-meter dash in Riverside Park. Courses run on the Arkansas Hills Trail System—dirt/jeep roads and narrow, hilly..

San Juan Solstice 50 Mile Run is a 50-mile ultramarathon set for June 20, 2026. The event uses a lottery-based entry with a cap of 300 runners; registration runs from January 15 to January 31. Lottery entrants are charged and confirmed, while additional applicants go to a waitlist and are not charge..

Silverheels Trail Runs, the 12th annual event from the Human Potential Running Series, unfolds in Colorado, with races including 100k, 100-Mile, 50-Mile, 60k, 19-Mile, and 10-Mile. The revamped format places the main event at the Como Roundhouse in Como, CO, while the 100-Mile and 100k start at Burn..

The Summit 200 is a single, non-repetitive 200‑mile loop around Summit County, Colorado, centered near Frisco. The mostly non-urban route uses single-track trails, forest roads, and some rec paths and pavement, with the lowest altitude above 9,000 ft and sections climbing toward 12,800 ft, plus 12 f..

Sheep Mountain Trail Runs, part of the Human Potential Running Series, takes place near Fairplay, Colorado on the western slope of the South Park Valley. The 12th annual event offers 50-mile, 50k, and Half Marathon distances, with a 16-hour time limit and a 300-runner cap. The start/finish is at the..