Trail Running Calendar Colorado 2025-2026

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..

Take on scenic singletrack loops near Fort Collins, Colorado, with 25 miles or 50 miles of rugged high country and big vertical gain. Expect technical trails, sweeping views and occasional wildlife encounters.

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 for a scenic riverside challenge that honors a fallen hero. Choose a family friendly 3.5 km or a hill testing 7.7 km onsite or run virtually from anywhere.

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 on June 6, 2026 at Granby Ranch Resort, Colorado, with options from a 6 mile to a challenging 50k. Experience single track trails, alpine meadows, and big climbs in a limited field for an intimate mountain race.

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..

Ring the Springs on June 20, 2026 showcases scenic high country trail routes at Garden of the Gods, CO. Choose 100K, 50K or 35K; field capped at 400 and registration ends June 15.

The Race in the Clouds - Alma Dirt Festival will take place in Alma from Thursday 25 June 2026 to Sunday 28 June 2026. You can run between 6 and 13 miles.

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, naviga..

Hit the foothill dirt trails at Lory State Park on June 27 for the Timberview Trail Run with 10 mile, 5 mile and beginner friendly 5K options. Finish with pancakes, craft beer and finisher swag at this USATF sanctioned community favorite.