Trail Running Calendar Colorado 2026-2027

Run among the iconic red rock spires of Garden of the Gods with distances from 5K to a Double Take or 9.5 mile course. Traffic free roads and trails promise stunning views of Pikes Peak and formations like Siamese Twins and Balanced Rock.

The Pilgrimage is a multi route ultramarathon in the high desert near Mack, Colorado, where 45 runners have 150 hours to complete 55 mile Journeys. Choose crewed support or go uncrewed; navigate five rotating off pavement routes for a raw,..

Take on the Collegiate Peaks Trail Run in Buena Vista Colorado with 25 or 50 mile options through stunning high country. Mark the 36th anniversary with a memorable mountain trail challenge.

Valkyrie Trail Race is a trail event for women at Cheyenne Mountain State Park with distances from 4 miles to 50K on scenic singletrack, technical rock sections, and mountain views. Pick a distance and enjoy a mountain trail challenge.

Adventure Fest at North Fruita Desert Trailhead near Fruita, CO on May 9 and 10, 2026 combines trail running, mountain biking and gravel racing with clinics and guided canyoneering. Camp, race a half or 50K and cap with a bonfire glowstick..

Take on Quad Rock 25 or 50 mile trail races through Lory State Park and Horsetooth Mountain Park near Fort Collins. Rugged singletrack, big climbs and full aid stations make this scenic loop a true mountain challenge.

Run the Fruita Trail Half Marathon through the North Fruita Desert, a scenic single loop of 13.8 miles with roughly 1000 feet of climbing and sweeping views of buttes and mesas. Expect flowy singletrack, technical climbs and lively aid stat..

Tackle scenic high alpine trails around Rampart Reservoir on May 16 with distances from 15K up to an epic 55 mile test of endurance. Expect rugged singletrack, big elevation gains, aid stations, a 60K shuttle and finisher awards.

Experience a scenic 14 mile loop around Vallecito Reservoir at the Vallecito Lake Heavy Half Marathon in Bayfield, Colorado on May 16, 2026. Limited to 250 runners, this fundraiser features varied terrain, pro timing, and a cupless, low imp..

Challenge yourself on the scenic Up & Over single track from Flying Dog Ranch to Rock Bottom Ranch in Carbondale, CO. Choose 10 mile or 25K routes and enjoy a trail running weekend with films and community vibes.

Samson's Revenge at the YMCA of the Rockies in Estes Park offers 10k, 27k and 55k looped trail races with a steep climb to Bible Point. Enjoy flowing single track, on course aid and a custom Fractel hat plus wool finisher socks.

Celebrate Memorial Day weekend with the Spirit Trail Race in Buena Vista, Colorado, a scenic trail event with marathon, half marathon and 9k options. Start in town square, enjoy Paddlefest fun, and support local nonprofits.

Celebrate Memorial Day with Pyro's Push It Up River Trail Run on May 25 in New Castle, honoring a fallen hero. Choose a family friendly 3.5 km riverside run or the scenic 7.7 km with hilltop climbs, available on site or virtually.

Run the North Fork 50 Ultras in Buffalo Creek, Colorado on May 30, 2026, with 50 mile and 50K options along scenic soft surface singletrack through ponderosa pine and granite. Enjoy challenging trails while supporting local nonprofits.

Hit alpine single track at Granby Ranch in Granby, Colorado on June 6, 2026 with options from 6 Mile to 50k and a unique Elevation Challenge. Expect rugged scenery, well stocked aid stations, and a lively resort finish.

The Great Divide Ultra is a weekend trail festival in Divide, Colorado, June 6-7, 2026, featuring 25k, 50k, 100k and 100 mile looped races through Mueller State Park with rolling meadows and Pikes Peak views. A Dark Divide Night Run adds ev..

Aiden's Adventure 5K on June 6 in Colorado Springs is a family friendly run and kids dash honoring Aiden while benefiting local charities. Enjoy scenic trails, free shirts for early registrants, carnival games and food trucks.

Mace's Hideout 100/50 is a June mountain trail race in Colorado's Wet Mountains offering 100 mile and 50 mile options. Runners cross alpine meadows to dry piñon for sweeping views on a route tied to a historic local hideout.

Run the Crazy Legs 10k+ at Devil's Backbone Open Space in Loveland, Colorado, a scenic looped course through Hidden Valley and Hunter Loop. Expect volunteer staffed aid, local sponsors, and a friendly community vibe; park pass required.

Scenic dirt trails around Barr Lake offer looped courses with continuous lake and front range views. Distances from 5K to 50K suit beginners to ultrarunners, with aid stations on longer routes and a cupless sustainability focus.