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,
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
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
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
Imogene Pass Run
Course HighlightsThe Imogene Pass Run is the crown jewel of Colorado's San Juan mountain races. The 17.1-mile point-to-point course climbs from Ouray (7,792 feet) up a historic mining road to the summit of Imogene Pass at 13,114 feet — gaining over 5,300 feet — before plunging 4,800 feet down the other side to finish in the gorgeous mountain town of Telluride. The route passes abandoned mine shafts, crosses alpine tundra covered in late-season wildflowers, and rewards runners with panoramic views
BolderBOULDER 10K
Course HighlightsThe BolderBOULDER is more than a race — it's Boulder's biggest party of the year, drawing over 50,000 participants through the heart of the city on Memorial Day. The 10K course winds through Boulder's eclectic neighborhoods, past live bands, costumed cheerleaders, and lawn-side water stations manned by local characters, before culminating in the stadium finish at CU Boulder's Folsom Field. Runners enter the field to the roar of tens of thousands of spectators and then watch a world-class professional