Trail Running calendar near Keystone 2026-2027

A fall mountain event on September 13, 2026 featuring a 25K loop past Crystal Mill, an 8 mile Quarry Climb, and a 2.5K kids run, with a post-race BBQ and proceeds benefiting Marble Charter School.

Run Rabbit Run in Steamboat Springs, Colorado is an annual trail ultramarathon offering 100 mile (Hares and Tortoises) and 50 mile divisions, limited-field races with a six-figure prize purse and a history of charitable giving.

A trail race on North Table Mountain in Golden, Colorado on September 19, 2026 offering 10 mile and 5 mile courses. Hosted by BeyondHome, the event raises funds to help families move from homelessness to self-sufficiency.

A 13.3 mile mountain race from Manitou Springs to the 14,115 foot summit of Pikes Peak, gaining about 7,800 feet on the historic Barr Trail. The 2026 Ascent uses wave placement based on estimated times and invites elite competitors.

Experience a 26.2 mile mountain run from Manitou Springs to the summit of Pikes Peak and back. This historic event features over 7800 feet of elevation gain and a 10 hour time limit.

Expo Park XC is an old school grass cross-country meet in Aurora, Colorado, featuring creek crossings, a wooden footbridge and bale jumps. Races range from about 1 km for young children to a 5 km open race.

Mountain trail ultramarathons in Crested Butte, Colorado on September 26, 2026 offer 35K, 55K and 50 Mile courses across alpine meadows and ridges. Aid stations are cupless and the event starts and finishes at Crested Butte Community School..

Experience desert style single track and forest roads with views of the Collegiate Peaks in Buena Vista. Choose between 50k or 30k distances as part of the multi sport 14er Fest.

A community driven 24 hour loop run in Palmer Lake, Colorado, on a 0.82 mile mountain course. Top three overall receive awards and the first ten runners to reach 100 miles earn onsite buckles.

A two-day trail and bike event in Estes Park featuring 31-mile bike and run options, a 15-mile heavy half, and a 62-mile duathlon, with rugged trails, significant climbs, and aid stations supporting competitors.

A scenic half marathon presented by ACG that runs from Fanny Hill in Snowmass along the Government Trail through Aspen groves to Koch Lumber Park, held each late September with registration opening in April.

A point to point trail race from Vail to Minturn with 26K and 14K courses across Vail Mountain. Both routes feature alpine singletrack, scenic views of Mt. Holy Cross, staffed aid stations and a post race lunch voucher.

A *5K* trail run on Town of Breckenridge Trails that finishes at Blue River Plaza on Main Street during Breckenridge Oktoberfest. Field limited to 300 runners; first 250 registrants receive a long-sleeve technical tee and 21+ entrants get a..

OUTLAST Colorado Springs is a 6 hour trail challenge with a 5K lap every hour for six rounds. Patches and a medal are awarded for laps completed and finishers are ranked on a national leaderboard with cash prizes for top times.

A high alpine 50k near Mount Princeton in Nathrop, Colorado, featuring 7,000 ft of climbing and a 13,100 ft high point. The course follows Chalk Creek Canyon and the Colorado Trail through ponderosa and aspen forests to an alpine plateau.

A fall trail event in Buena Vista, Colorado on September 27, 2026 offering a 14K trail race with over 500 feet of elevation gain and a 5K along the Arkansas River. Both races start and finish at Vendor Village near the Eddyline Beer Garden.

A weekend trail running festival at Bear Creek Lake Park offering 100K, 50M, 50K, half marathon, 10K and 5K on mostly singletrack terrain with looped courses, aid stations, drop bags, and controlled crew and pacer rules.

Experience the scenic HRCA Backcountry Wilderness Area with trail races for the whole family. Enjoy rolling hills and open views followed by a pancake breakfast and finisher medals for all participants in Littleton.

A Woodland Park trail event featuring 50k and 10k options on singletrack and forest roads with views of Pikes Peak, stocked aid stations, and crew access for the 50k.

Trail races on Emerald Mountain near Howelsen Hill offering a 12k about 7.75 miles and a 4 mile option over aspen-lined singletrack. Awards and series prizes are presented at Olympian Hall after the race.