Trail Running Calendar Colorado 2025-2026

Blue Sky Marathon and Half on October 18 and 19, 2025 invites trail runners to scenic singletrack through Horsetooth Mountain Park in Fort Collins, Colorado. Choose a rugged 26.7 miles or a lively 13.4 miles with stocked aid stations and li..

Explore Palmer Park's rocky single track and sweeping city and mountain views at the Bobcat Trail Races in Colorado Springs. Choose from 50K, 25K, 10K or 5K and test your trail legs on technical, scenic routes.

Run scenic single track trails near the Denver skyline at the Great Trailhead Foot Race in Bear Creek Lake Park on October 18, 2025. Choose 5 or 10 miles, get a tech tee and post run party, and 10 mile finishers earn a mug.

Indian Creek Trail Runs in Sedalia Colorado on October 18 2025 features scenic single track through pine and red rock with distances from 5 mile to 50 mile. Choose 5 mile, 15 mile, 55k or 50 mile and earn a unique finisher award.

Event overview The Sheriff’s Shootout is a lap-based endurance race held on October 18, 2025, in Montezuma County, Colorado. The event is organized by Dolores Bike Hostel and local community members. Runners choose between 6-hour and 12-hou..

Bridge Burner Ultra in Cañon City, Colorado, is a scenic single loop along the Arkansas River, through Tunnel Drive and over the highest bridge in the United States with stunning Royal Gorge and Pikes Peak views. Distances from 10K to 35 mi..

Tackle scenic dirt trails at Bear Creek Lake Park with 5 km, 15 km, a 5 plus 15 double, or a kids 1 km. Registration includes socks or a neck gaiter and a pancake breakfast while kids earn a stuffed bear at the finish.

The Colleen De Reuck XC Classic is a cross country running event held annually at Harlow Platts Community Park in Boulder, Colorado. Honoring renowned distance runner Colleen De Reuck, the race promotes health, fitness, and celebrates local..

Run against the clock on a fully supported one mile dirt loop in Fort Collins, Colorado, choosing 6, 12, or 24 hour solo or relay formats. Enjoy an overnight challenge chasing distances from a marathon to an ultra in a friendly setting.

Join the 17th Backcountry Wilderness Half Marathon, a single loop 13.1 miles trail in Highlands Ranch with mountain views and wildlife. November trails can be muddy or snowy; finishers receive a tech shirt, medal, pancakes and post race bee..

Event The Kokopelli XC Invitational takes place on November 8, 2025 at the El Pomar Youth Sports Complex, 2212 Executive Circle, Colorado Springs, CO. The 2025 event adds a USATF Open/Masters division as part of the Colorado Long Distance G..

Run world class singletrack in Fruita Colorado and soak up views of the San Juan Mountains and Colorado National Monument. Distances from 10 mile to 50 mile offer the perfect racecation on fast flowing desert trails.

BINGO! Trail Party at May Farms in Byers on Nov 8, 2025 mixes looped trail running with a bingo twist where runners draw chips each loop to earn a finish before the 9:00 PM cutoff. Farm trails, one aid station and on site camping.

Located in Colorado Springs’ North Cheyenne Cañon Park, the Canya Cañon Trail Race & Family Hike offers a 4-mile trail race along the Columbine Trail, starting at the Starsmore Visitor & Nature Center (2120 S Cheyenne Canyon Rd). The course..

Run the Louisville Trail Race on November 15, 2025, amid the Flat Irons with 13.1, 10K or 5K dirt courses on scenic trails. Enjoy post race festivities and bring a reusable cup or purchase one onsite.

Event overview The Colorado Cold Rush Ultra takes place on November 22, 2025, in Colorado Springs, CO, with the start/finish at Bear Creek Regional Park West. Offered distances include: 50k Half Marathon 10k Registration closes on Novembe..

Experience winter trails at Staunton State Park on December 6, 2025 with the Sawmill Trail Runs offering 50k, 16 mile, and 8 mile options through high meadows and granite cliffs. Enjoy well stocked aid stations, unique finisher awards, and..

Take on the Thumbs Up Vertical Challenge in Estes Park CO on December 6, 2025, a small field test of grit with steep single track laps and sweeping views of Longs Peak and Mount Meeker. With only 30 spots, this intimate winter climb rewards..

USCSA Cross Country Ski Racing Festival, hosted by Colorado Mesa University at Snow Mountain Ranch Nordic Center in Granby, Colorado, on January 24–25, 2026, brings collegiate teams together with junior skiers for a two-day Nordic festival...

Lace up for the Rio Frio 5k on Ice and run across the frozen Rio Grande in Alamosa, CO on January 24, 2026. Chip timed with ice themed awards and a festive winter vibe for adventurous runners.