Trail Running Calendar Colorado 2025-2026

Greenland Trail Races is a multi-distance trail running event held at Greenland Open Space in Larkspur, Colorado. The lineup includes 50K, 25K, 8-mile, and 4-mile races, all run on dirt trails within the scenic open space, offering wide, smooth double-track surfaces and views of Pikes Peak. The cour..

The Pilgrimage is an ultramarathon-style event held in Mack, Colorado, in the high desert of western Colorado, on May 3, 2026. It features five color-coded routes (Green 6.7 mi; Orange 11.3 mi; Red 11.9 mi; White 12.6 mi; Blue 12.8 mi), totaling about 55 miles per journey, with a 150-hour limit to c..

The Valkyrie Trail Race, held in Cheyenne Mountain State Park near Colorado Springs, Colorado, is a women-focused trail running event offering distances from 4 miles up to 50 kilometers. The course begins on crushed limestone meadows before transitioning to singletrack trails ascending Cheyenne Moun..

Ram Party Trail Runs takes place Saturday, May 16, 2026, at Buffalo Lodge Bicycle Resort in Colorado Springs, Colorado. The event offers multiple distances: 55 Mile - 53.9 miles, 6,964 ft total elevation gain 60K - 38 miles, 3,279 ft gain, 6,040 ft loss 50K - 30.3 miles, 4,412 ft gain 24K - 13.2 m..

The Endure Trail Runs is scheduled for May 16, 2026 at the Pisgah Point Group Campground in Mueller State Park, Divide, CO. The event includes the following distances: 12-Hour timed event Marathon Half Marathon 10k Runner capacity is 225 combined. The 10k, Half Marathon and Marathon carry an 11-h..

The Weld Your Mettle Running Festival, held in Eaton, Colorado, is a multi-day event featuring a variety of running challenges for all levels. Participants can choose from solo or relay races lasting 3, 6, 9, 12, 24, or 36 hours, including a 100-mile ultra with a 36-hour limit. Unique formats like t..

North Fork 50 Mile/50K is an ultramarathon set in the Colorado mountains just southwest of Denver, near Buffalo Creek. The event offers two distances: 50 miles and 50K. The course is 100% soft-surface, comprised mostly of singletrack trails with a few short sections of double-track road.Runners clim..

Aiden's Adventure 5k takes place on Saturday, June 6, 2026, in Colorado Springs, CO. The event includes in-person and virtual options and donates all proceeds to Care and Share of Southern Colorado and Catamount Institute. Event activities include rock painting, a butterfly release, and carnival ga..

The Great Divide Ultra, held June 6-7, 2026 in Divide, Colorado, is part of Revenant Running’s festival. Distances offered are 100 mile, 100k, 50k, and 25k. The 100‑mile course is six 14.8‑mile loops plus a 10.5‑mile loop through Mueller State Park on smooth single/double‑track trails, delivering sw..

Summits Trail Runs, the 2nd Annual edition of the Human Potential Running Series, unfolds at Granby Ranch Resort in Colorado’s Rocky Mountains (Granby, CO). The race weekend offers several distances: Elevation Challenge (a 32-hour ascent loop on East Peak), 50k, Marathon, Half Marathon, and 6 Miles,..

Crazy Legs 10k+ Trail Run is held at Devil’s Backbone Open Space in Loveland, Colorado, starting and finishing in the parking lot. The loop course runs through Hidden Valley, Hunter Loop, Laughing Horse Loop, and Wild Loop for roughly 10k+, with a low-key atmosphere. The route is flour-arrow marked..

San Juan Solstice 50 Mile Run is an ultramarathon scheduled for June 20, 2026. The event features a 50-mile course, with a dedicated course info page and an alternate course option, underscoring a challenging yet community-focused atmosphere. Entry is lottery-based with a cap of 300 runners; selecte..

Ring the Springs is a trail running event on Saturday, June 20, 2026, at Rock Ledge Ranch at Garden of the Gods, 3105 Gateway Road, Colorado Springs, CO 80904. The event offers three distances: 100K 50K 35K The 35K field has an entrant limit of 400 runners. Registration closes on Monday, June 15...

Timberview Trail Run is held at Lory State Park in Bellvue, Colorado, just outside Fort Collins. The event offers three distances: 5K, 5 Mile, and 10 Mile (the 10M is a double loop of the 5M). Runners traverse scenic forest trails with views of Horsetooth Reservoir and the foothills; the 5K is begin..

The John Cappis is a challenging endurance peakbagging event held near Silverton, Colorado, featuring a roughly 50k course with about 19,000 feet of elevation gain. Participants summit multiple peaks in the rugged San Juan Mountains, navigating an unmarked, mostly off-trail route with elevations ran..

The Race in the Clouds - Alma Dirt Festival is a multi-sport outdoor event held in Alma, Colorado in 2026. The festival base is Alma Cemetery Meadow, at about 10,600 ft elevation and roughly half a mile from downtown Alma. The event program includes mountain biking, trail running, an off-road duath..

The Silverheels Trail Runs take place July 10-11, 2026, with start/finish operations based at the Como Roundhouse in Como, CO. Distances offered include: 100-Mile 100k 50-Mile 60k 19-Mile 10-Mile Runner capacity is limited: 100 combined for the 100-Mile and 100k, and 200 combined for the 50-Mile,..

The event includes three distances: 50K Marathon (about 26.8 miles) 8 Miler (about 8.4 miles) The 50K and marathon run a loop on the Alpine Loop jeep roads in the San Juan Mountains. Runners pass historic ghost mining towns including Howardsville, Eureka, Animas Forks, and Gladstone. The course r..

Barr Trail Mountain Race is a 12.6-mile summer mountain running event along Pikes Peak. The course starts at Cog Railway Station in Manitou Springs (6,570 ft), ascends Barr Trail to Barr Camp at 10,200 ft, then turns, descends, and finishes at Barr Trailhead. The race is CUP-less and runners should..

The Kendall Mountain Runs take place in Silverton, Colorado on Sunday, July 19, 2026. This is the 45th annual running of the event, which traces its origins to a local wager in 1908 and was established as an annual race in 1978. The event is organized by Aravaipa Running and uses downtown Silverton..