Trail Running Calendar Colorado 2025-2026

Run scenic double track with Front Range views at the Greenland Trail Races in Larkspur, Colorado, offering 4 Mile to the RRCA National 50K Championship. Finishers receive a tech shirt, medal and a 50K belt buckle.

Niwot's Challenge is a by invitation only endurance event near Sedalia, Colorado that prizes off trail navigation and self reliance over racing. Limited to 40 entrants, it offers routes up to 100 miles for experienced wilderness runners.

Run among iconic red rock formations with sweeping views of Pikes Peak at Take 5 in the Garden on May 2, 2026 in Garden of the Gods, Colorado Springs. Road and trail races range from a 5K to 9.5 miles and the park will be closed to vehicles..

The Pilgrimage is a 150 hour ultra in Colorado's high desert where runners repeat five off road routes about 55 miles per circuit. Only 45 spots and crewed or uncrewed divisions share a single home base with basic support.

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 women focused spring trail festival at Cheyenne Mountain State Park near southern Colorado Springs, with multiple distances from 4 miles to 50K. Expect climbs, singletrack and technical rocky descents for a scenic,..

Adventure Fest in Fruita CO on May 9 and 10, 2026 is a two day outdoor celebration of trail and gravel racing, clinics, guided canyoneering, kids races and lively evening events. Camp at the trailhead and enjoy post race bonfires and commun..

Tackle the Quad Rock 25 or 50 mile trail races on May 9, 2026 in scenic Lory State Park and Horsetooth Mountain Park near Fort Collins. Expect rugged singletrack, big climbs and sweeping views for a challenging, unforgettable day on the tra..

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..

Ram Party Trail Runs is a weekend of scenic high country trail races around Rampart Reservoir near Colorado Springs, offering distances from 15K to 55 mile. Expect big climbs, alpine views, finisher awards and a welcoming race vibe.

Join the Spirit Trail Race in Buena Vista on May 24, 2026 for marathon, half marathon or 9K during Memorial Day weekend and CKS Paddlefest. Scenic start at South Main Town Square and proceeds support local conservation and community groups.

Join Pyro's Push It Up River Trail Run on Memorial Day in New Castle to honor a fallen hero. Choose a family friendly 3.5 km riverside route or a scenic 7.7 km trail with climbs, wooded sections and river views.

Run the North Fork 50 Mile or 50K on scenic singletrack around Buffalo Creek, Colorado. Choose your distance, enjoy aid stations and a festive finish, and support the North Fork Volunteer Fire Department.

Run the Summits Trail Runs at Granby Ranch Resort in Granby, Colorado on June 6, 2026. Choose distances from 6 miles to a 12 hour Elevation Challenge across scenic single track, alpine meadows and big climbs.

Explore high alpine loops at Mueller State Park on June 6 and 7 for the Great Divide Ultra, with distances from 25k to 100 mile and night run options for 25k and 50k. Scenic views, supportive aid, and standout finish swag await.

Join Aiden's Adventure 5k at Fountain Creek Regional Park for a relaxed, family friendly trail fun run with a virtual option and a kids mile. Enjoy crafts, a butterfly release, food trucks and community vibes while supporting local charitie..

Mace's Hideout 100/50 offers 100 and 50 mile ultramarathon routes across Colorado's Wet Mountains. Traverse forests, alpine meadows and dry foothills with sweeping peaks, dark skies and a touch of outlaw lore.

Take on the Crazy Legs 10k trail run through the scenic Devil's Backbone Open Space in Loveland on June 7, 2026. Limited spots, marked trails, and a post race celebration at Loveland Aleworks make this a fun mountain running day.

Run the scenic Barr Lake Trail Race at Barr Lake State Park in Brighton, CO on June 13, 2026. Choose from 5K to 50K on a looped dirt course with continuous lake and Front Range views, friendly aid stations, and a relaxed mostly flat route.

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 atmospher..