Trail Running calendar near Boulder 2026-2027

Experience a snowshoe running event at the Snow Mountain Ranch YMCA in Colorado. Choose from 5k, 25k, or 50k distances on groomed trails and singletrack with a mandatory snowshoe requirement.

Experience an exclusive trail race at the private Sylvan Dale Guest Ranch in Loveland. Choose from 5K and 10K Friday evening runs or endurance challenges ranging from 4 to 12 hours on Saturday.

Celebrating its 11th year, the Mountain Ridge Trail Race winds through the rolling hills of Highlands Ranch, Colorado. Runners can choose from four distances, all on scenic dirt trails with rewarding front range views. The event is cupless,..

Explore Northern Colorado on the Poudre River Trail. This ultra offers 50 and 100-mile options, both for solo runners and relay teams. The unique 100-mile format combines a race day event with a virtual segment.

The Great Western Trail Race, a BOLDERBoulder qualifier in Severance, Colorado, is not scheduled for 2026 but may return. It has featured 5k, 10k, half marathon, and kids run distances. The event supports local community foundations and non..

Experience the beauty of Colorado's Front Range at the Greenland Trail Races in Larkspur. Run through native grasslands and rolling hills with four distances ranging from a 4 mile trek to a championship 50K ultra.

Niwot's Challenge is a secretive, map-and-compass adventure in Colorado for experienced navigators. It features unsupported loops with significant off-trail travel and elevation gain. Entry is by application only for a limited field of part..

Experience the 45th annual run along the scenic High Line Canal in Centennial. Enjoy chip timed 5K or 10K races followed by a pancake breakfast and beer garden.

Join the Aurora community for an untimed 1k fun run or a timed 5k race ending with an optional muddy obstacle course. This rain or shine event welcomes runners and walkers of all ages.

Experience the rugged beauty of the Rocky Mountain foothills in Fort Collins with a 25 or 50 mile trail race through Lory State Park and Horsetooth Mountain Park featuring significant vertical gain and scenic ridgeline views.

Experience a scenic 7.4 mile trail loop through the canyon trails of O’Fallon and private property in Kittredge. This community event includes a kids' age-based run plus post-run sauna and cold plunges in Bear Creek.

Experience a unique trail event at Mueller State Park featuring traditional distances and a 12 hour challenge where the course is determined by the luck of the draw. Enjoy 100% unpaved trails in the scenic Colorado mountains.

Samson's Revenge is a trail race on the historic grounds of the YMCA of the Rockies in Estes Park. Runners can choose from 10k, 27k, or 55k distances on a challenging loop course. All participants receive a day pass to the YMCA and custom r..

The Farish Trail Race takes place on May 23, 2026 at the Farish Recreation Area in Woodland Park, Colorado. Participants can run a half marathon, 10K, 5K, or a free kids' one-mile event. The first 200 finishers get a special hat.

Test your endurance at this Golden Colorado event following the classic backyard format with 4.17 mile laps every hour. Support the Sun Valley Kitchen and Community Center while pushing for your personal best distance.

Test your resilience on a scenic two mile dirt loop in Northern Colorado with distances ranging from 7k to 100 miles. Enjoy a festival atmosphere featuring glamping, saunas, cold plunges, and relay options for teams.

Experience a mountain trail ultramarathon through the scenic Buffalo Creek Recreation Area in Colorado. Choose between a 50 mile or 50K course featuring nearly 100 percent singletrack trails and stunning granite rock formations.

A 20K route around Turquoise Lake in Leadville, CO, running clockwise from Matchless Boat Ramp with paved and single track sections. Adult entry is $40 and under 18 run free. Parking is limited and a day use fee may apply.

Experience a scenic 5K trail run through subalpine forests and lakeside paths at the historic Leadville National Fish Hatchery. This cross country style event supports local youth athletics and recreation in the Leadville area.

Experience the Rocky Mountains at Granby Ranch Resort with distances ranging from 6 miles to a 14 hour elevation challenge. Runners navigate single track trails through aspen groves and alpine meadows with views of the mountain range.