HRCA Backcountry Wilderness Half Marathon
Course HighlightsThe HRCA Backcountry Wilderness Half Marathon is one of the Denver metro area's most popular trail half marathons, set within the stunning Highlands Ranch Backcountry Wilderness Area in Douglas County. The 13.1-mile course winds through the Douglas County East/West Trail and the wilderness backcountry on a mix of singletrack, rolling hills, and open-sky ridgelines with breathtaking panoramic views of the Front Range. The trails traverse native grasslands, ponderosa pine forests, and open meadows that are home to deer, foxes,
Colorado Marathon Relay
Course HighlightsThe Colorado Marathon Relay gives teams of runners the chance to tackle Colorado's most scenic downhill marathon course together. Relay teams are divided across the dramatic point-to-point course that descends from the Rocky Mountain foothills through the Cache la Poudre River Canyon — a designated Wild and Scenic River — all the way to the finish line in Washington Park in Old Town Fort Collins. The canyon section features rushing whitewater rapids, dramatic sandstone walls, and cottonwood groves; the
Colfax Marathon Relay
Course HighlightsThe Colfax Marathon Relay lets teams of five runners share the full 26.2-mile Colfax Marathon course through Denver's most iconic landmarks. The relay is divided into four legs, sending runners through Empower Field at Mile High on the warning track, along the bustling Colfax Avenue past the State Capitol and VooDoo Donuts, through a full mile inside Denver Zoo with live animal spectators, around Sloan's Lake with Rocky Mountain views, and through Lakewood before returning to the City Park
Crested Butte Ultra
Course HighlightsThe Crested Butte Ultra is a showcase of the extraordinary terrain surrounding one of Colorado's most beloved mountain towns. Three distances — 35K, 55K, and 50 Mile — traverse the Gunnison National Forest on lollipop-loop courses that combine wide-open mountain meadows blanketed with wildflowers at lower elevations, heart-pumping climbs to dramatic mountain ridgelines, and single-track trails through aspen groves that glow gold in late September. The course elevation ranges from approximately 7,500 to 12,500 feet across the 50-mile distance,
Run Rabbit Run 50 & 100 Mile
Course HighlightsThe Run Rabbit Run takes place across the mountains surrounding Steamboat Springs, starting and finishing at the base of the Steamboat Springs ski area at 6,900 feet. The 50-mile course climbs to the summit of Mount Werner at 10,568 feet, descends into the valley, and then makes a dramatic traverse across the Continental Divide to Rabbit Ears Mountain at 10,500 feet before returning to the ski area base. The 100-mile course additionally circumnavigates Buffalo Pass at 10,300 feet and
Sage Burner Trail Race
Course HighlightsThe Sage Burner Trail Race takes place in the Hartman Rocks Recreation Area just west of Gunnison, Colorado — a landscape utterly unlike the classic Rocky Mountain high-alpine environment. Here the hills are covered in sage brush and the terrain alternates between technical slickrock, smooth flowing singletrack, and doubletrack roads built for speed. The course is described as 'deceptively tough' — rolling hills and punchy climbs in a high-desert climate at approximately 7,700 feet elevation. From the ridgelines, runners
Quad Rock 50 & 25 Mile
Course HighlightsThe Quad Rock 50 and 25 mile trail races take place entirely on the premium singletrack trails of Lory State Park and Horsetooth Mountain Park, just west of Fort Collins in the northeastern Colorado Rockies. The 25-mile course features three major climbs and descents totaling over 5,500 feet of vertical gain on 85% singletrack and 15% dirt road, running clockwise from Soldier Canyon. The 50-mile course runs the 25-mile loop twice in opposite directions, accumulating over 11,000 feet of
Colorado Marathon
Course HighlightsThe Colorado Marathon earns its reputation as Colorado's fastest downhill marathon with a dramatic point-to-point course that begins in the Rocky Mountain foothills at 6,111 feet in the Poudre Canyon and descends along the Cache la Poudre River all the way to downtown Fort Collins. Runners are bussed to the canyon start before dawn, then run downstream past rushing whitewater, dramatic sandstone canyon walls, and cottonwood groves before emerging onto the agricultural plains and finishing at Washington Park in
Horsetooth Half Marathon
Course HighlightsThe Horsetooth Half Marathon is one of the most respected and competitive half marathons in the Mountain West, drawing elite runners and serious age-groupers to the foothills west of Fort Collins each spring. The point-to-point course starts on Dixon Canyon Road in the hills above Horsetooth Reservoir at approximately 6,000 feet, descends through dramatic red rock canyon scenery with views of the reservoir, and finishes at the iconic New Belgium Brewing Company in Fort Collins. The course features +917
Telluride Mountain Run
Course HighlightsThe Telluride Mountain Run is one of the most visually spectacular mountain running events in the American West, set above the jaw-dropping box canyon town of Telluride in the heart of Colorado's San Juan Mountains. Runners navigate old mining roads, technical singletrack, and sweeping alpine tundra over mountain passes and exposed ridgelines, with portions of the course reaching above 13,000 feet. The 65-mile distance — new for 2026 — starts at 6:00 AM from Telluride Town Park and traverses