Trail Running Calendar Colorado 2025-2026

Join the USCSA Cross Country Ski Racing Festival at Snow Mountain Ranch in Granby Colorado on Jan 24 and 25 2026. Collegiate teams and middle and high school racers take on classic distances and a skate sprint over two action packed days.

Test your winter legs on the frozen Rio Grande in Alamosa with a chip timed 5k on January 24, 2026, complete with ice themed awards. An alternate pond course will be used if ice is unsafe and traction footwear is recommended.

Join the Freakin Freezin 5K in Denver on January 25 for a chilly, car free, flat trail run at Northfield High School with medals for all finishers. Choose a 5K, a no shirt option, or run virtually and score a finisher package.

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.

Join the Super Sunday 5K on February 8, 2026 for a fun run or walk along the Mary Carter Greenway. Celebrate afterward at Breckenridge Brewery Farmhouse with event swag and 20% off food and drinks.

Ski around Gothic Mountain at the Gothic Mountain Tour in Crested Butte on Feb 15, 2026. Choose a 23.5 mile competitive or 17.85 mile recreational course and support Crested Butte Nordic in this intimate 200 person fundraiser.

Stories Trail Runs at Cheyenne Mountain State Park on Feb 21 and 22, 2026 offers multi loop trail racing with timed 6 and 15 hour ultras plus 10k to 20 mile courses. Two day passes and on site camping make it a scenic weekend of challenge a..

The Pine Needle Langlauf Nordic Ski Race will take place in Durango on Saturday 21 February 2026. You can run between 8 and 30 kilometers.

Run the 21st Run Through Time in Salida, Colorado on scenic Arkansas Hills trails with marathon, half marathon, 2 Mile and kids races at high elevation. Finishers get custom socks and a light meal while proceeds support local trail and resc..

Race The Ranch in Granby, Colorado invites snowshoers to tackle scenic looped courses at Snow Mountain Ranch across 5k, 25k, and 50k distances. Finishers earn a custom beanie and engraved camp mug in this supported winter adventure.

The Desert Rats Trail Running Festival will take place in Fruita from Friday 10 April 2026 to Sunday 12 April 2026. You can run between 9 and 100 kilometers.

Join Run the Ranch April 10 and 11, 2026 at Sylvan Dale Guest Ranch in Loveland, Colorado for trail races on private ranch trails, from 5K and 10K to timed 4 hour, 6 hour and 12 hour solo and relay events. Virtual options available.

Experience Colorado single track trails at Mountain Ridge Trail Race on Saturday April 11 2026 in Highlands Ranch, with distances from 5K to 21 Mile and live tracking. Scenic dirt paths and climbs offer a rugged, cupless trail challenge.

Run the Poudre River Trail April 11 and 12 2026 at the NoCo Urban Ultra and Relay, with 50 and 100 mile solo or relay options. Enjoy a scenic route through Fort Collins, Timnath, Windsor and Greeley and celebrate at a lively finish festival..

Run Palmer Park's singletrack at the Rattler Trail Race on April 18, 2026, with 50K, 25K, 10K and 5K options. Enjoy technical trails, sandstone bluffs and sweeping views of Colorado Springs and distant Pikes Peak on a low elevation gain cou..

Run the rim at Royal Gorge Groove in Cañon City, Colorado, with distances from a 5K to a rugged 50K. Enjoy technical trails, sweeping Arkansas River views, live chip timing, and an energetic resort atmosphere.

May 2, 2026: Greenland Trail Races at Greenland Open Space in Larkspur offer distances from 4 miles to 50K plus a virtual option. Scenic dirt trails with Pikes Peak views, aid stations, tech shirts, medals, and a 50K 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.