Trail Running Calendar Colorado 2025-2026

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.

Run the Colleen De Reuck XC Classic in Boulder on November 1, 2025 at Harlow Platts Community Park. Youth and open cross country races celebrate local distance legends and offer scenic fall competition as part of the Boulder XC series.

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..

Run the Kokopelli XC Invitational in Colorado Springs, featuring youth races and a competitive 5 km Open and Masters race. Part of the Colorado Long Distance Grand Prix Series with a $10,000 prize purse and club championship.

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.

Experience fast, flowing singletrack on the Zippity Do Da Trail in Fruita, Colorado at the Kessel Run Ultra on November 8, 2025. Choose from multiple distances and enjoy views of the San Juan Mountains and Colorado National Monument.

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..

Hit the trails at Louisville Community Park for the 12th annual Louisville Trail Race, with 5K, 10K and half marathon options on scenic dirt trails. Enjoy live split tracking, post race festivities and a cupless sustainability focus.

Take on the Colorado Cold Rush Ultra in Colorado Springs on Nov 22, 2025 with 50k, half marathon or 10k on scenic Bear Creek and High Drive trails. Runners get a race shirt, BOCO beanie, personalized bib, finisher award and post race food.

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..

Challenge yourself in the Thumbs Up Vertical in Estes Park, an 8 hour timed ascent limited to 30 runners. Each 540 ft steep scenic single track lap earns a poker chip, with milestone patches and a prize for the overall winner.

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.

Push your limits at the 12 Hours of Sunlight in Glenwood Springs, a 12 hour skin up and ski down endurance challenge on 1.3 mile laps with huge vertical gain per lap. Teams and individuals enjoy fuel stations, post race food and gear prizes..

Tackle the Sourdough Snowshoe Race in Nederland CO on Jan 31 2026, a donation based backcountry challenge where snowshoes are required for the full route. Choose 18K or 30K and warm up at the finish with hot drinks and a warming tent.

Gothic Mountain Tour is a scenic Nordic ski fundraiser in Crested Butte on Feb 15, 2026 supporting Crested Butte Nordic. Choose 23.5 miles competitive or 17.85 miles recreational and finish at the Magic Meadows Yurt.

Run Cheyenne Mountain trails at Stories Trail Runs in Colorado Springs with 6 hour and 15 hour timed events plus 10k to 20 mile races. Choose a single race or a two day pass for a weekend of scenic, challenging trail running.

Pine Needle Langlauf at Durango Nordic Center offers freestyle Nordic racing on scenic, challenging terrain across multiple distances. Finish the Southwest Nordic Race Series with live music, awards and participant schwag.

Run Through Time in Salida Colorado offers marathon, half, 2 mile and kids 400 meter races on scenic high altitude Arkansas Hills trails. Limited fields, single track terrain and custom race socks make for a memorable spring trail day.

Race The Ranch at Snow Mountain Ranch in Granby Colorado on April 4, 2026 is a scenic snowshoe race with distances up to 50k on singletrack and groomed trails. Tackle challenging loops, enjoy on course aid, and earn a custom finisher mug.