Trail Running calendar near Fort Collins 2025-2026

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.

Run the Blue Sky Trail Marathon or Half in Horsetooth Mountain Park, Fort Collins on October 18 and 19, 2025. Enjoy rugged singletrack, sweeping Colorado views and well stocked aid stations in a limited field for a truly authentic trail exp..

Join the Expo Park XC Runs in Aurora on Sunday October 19 for youth and adult cross country races from 1k to 5k. Enjoy mostly grassy, gently rolling courses with a creek crossing and bale jumps for a fun, family friendly race day.

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..

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.

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.

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..

Event overview The Twin Mountain Trudge takes place on January 10, 2026 in Laramie, WY. This is the 22nd running of the event. Registration opens on October 1, 2025. Two race options are offered. ~10.2 miles ~20.5 miles Course, aid, and r..

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...

The Sourdough Snowshoe Race will take place in Nederland on Saturday 31 January 2026. You can run between 18 and 30 kilometers.

Race The Ranch invites snowshoers to YMCA Snow Mountain Ranch in Granby Colorado on April 4 2026 for multiple distances on scenic trails and lesser known loops. Expect challenging climbs, friendly aid stations and great finisher swag.

Run the Ranch is an annual trail running event held at the scenic Sylvan Dale Guest Ranch in Loveland, Colorado. The race offers a variety of distances including 5K, 10K, and timed trail runs of 4, 6, and 12 hours, with options for solo run..

The Great Western Trail Race, held in Severance, Colorado, offers a variety of running events including a 5K, 10K, half marathon, and a Kids Fun Run. Scheduled for April 18, 2026, this race welcomes participants to enjoy spring racing in a..

The Quad Rock 50 will take place in Fort Collins from Saturday 9 May 2026 to Sunday 10 May 2026. You can run between 25 and 50 miles.

The Weld Your Mettle Running Festival, held in Eaton, Colorado, is a multi-day event featuring a variety of running challenges for all levels. Participants can choose from solo or relay races lasting 3, 6, 9, 12, 24, or 36 hours, including..

Enjoy alpine single track through meadows and aspen groves at Granby Ranch Resort with distances from 6 Mile to 50k and a unique Elevation Challenge scored by total climb rather than distance. Small field and stocked aid stations make for a..

Run the Crazy Legs 10k+ at Devils Backbone Open Space in Loveland, Colorado, a scenic singletrack course with aid stations and lively local support. Limited spots remain and this is the event's final year, so grab your spot now.