Trail Running calendar near Longmont 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.

Mountain Ridge Trail Race in Highlands Ranch Colorado offers multiple trail distances on mostly dirt and single track along the Douglas County East West Regional Trail. Rolling hills, aid stations on longer courses, drop bags and live split..

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 an invitation only, navigation focused ultradistance trial near Sedalia, Colorado, emphasizing off trail travel, limited aid, and self reliance across options from about 24 to 100 miles.

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 unique 7.4 mile community trail race through the canyon trails of O’Fallon and private Kittredge lands. Enjoy a post race celebration at Kittredge Park with food, a sauna, and a fun kids lap run.

Trail races at the YMCA of the Rockies in Estes Park with 50k, 25k and 10k options on a looped course featuring the Bible Point climb, two aid stations, and race swag including a Fractel hat and wool socks.

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.

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.

Run a flat and fast off road course at an animal sanctuary with views of the Rocky Mountains. Choose from multiple distances and timed events while supporting rescued farm animals in a festival atmosphere.

Experience a scenic loop course through the Devil’s Backbone Open Space in Loveland. This manual timed trail run features natural terrain and includes a commemorative hat for all participants.

Looped trail races around Barr Lake in Brighton, Colorado, with five distances on 100 percent dirt and lake and Front Range views. Courses have low elevation gain per loop, designated aid stations on longer routes, and drop bag areas.

Experience up to three miles of messy fun at the Colorado National Speedway. Navigate obstacles by crawling wading and sliding through the mud with friends and family during this unique event in Dacono.