Trail Running calendar near Castle Rock 2026-2027

The Sourdough Snowshoe Race in Nederland, CO is a donation based backcountry event offering 18K and 30K routes where snowshoes are required. Enjoy rugged alpine scenery with a warming tent and hot drinks at the finish.

Join the Super Sunday 5K on February 8, 2026 in Littleton for a scenic run along the Mary Carter Greenway. Celebrate at a post race party at Breckenridge Brewery Farmhouse with 20% off food and drinks and community fun.

A two-person partner race on Virginia Canyon road in Idaho Springs, CO, held on Valentine’s Day. Runners each complete a roughly 12-mile out-and-back; team time is the sum of both individual times and multiple awards are offered.

Stories Trail Runs at Cheyenne Mountain State Park offer scenic, challenging multi loop trail races and timed ultras on Feb 21 and 22, 2026. Choose distance races or 6 hour and 15 hour timed options in a small field for rugged Colorado trai..

Race The Ranch is a snowshoe race at Snow Mountain Ranch near Granby, Colorado on April 4, 2026, offering 5k, 25k and 50k looped courses over scenic groomed and singletrack snow trails. Finishers receive a custom beanie and engraved Miir ca..

A multi distance trail event at Sylvan Dale Guest Ranch in Loveland CO on April 10–11 2026, featuring 5K and 10K runs plus 4 hr, 6 hr and 12 hr timed races and relay and virtual options. Camp and on site aid station available.

Mountain Ridge Trail Race on Saturday April 11 2026 in Highlands Ranch Colorado starts and finishes at Mountain Ridge Middle School. Choose 21 mile, half marathon, 10 km or 5 km on mostly dirt single track with rolling climbs.

Join the Rattler Trail Race in Palmer Park, Colorado Springs, where singletrack trails wind through sandstone bluffs and offer panoramic views of the city and Pikes Peak. Choose from 50K, 25K, 10K or 5K on technical but runnable terrain.

Experience cliffside trail running along the Royal Gorge rim on April 25, 2026 in Cañon City, Colorado, with rocky technical trails and epic views over the Arkansas River. Distances from a fun 5K to a tough 50K suit all trail runners.

On May 2, 2026 Greenland Trail Races in Larkspur, Colorado offer 4 Mile, 8 Mile, 25K and 50K trail options on dirt trails with aid stations, chip timing, a virtual option, and awards by overall and age group.

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 the iconic red rock spires of Garden of the Gods with distances from 5K to a Double Take or 9.5 mile course. Traffic free roads and trails promise stunning views of Pikes Peak and formations like Siamese Twins and Balanced Rock.

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 trail event for women at Cheyenne Mountain State Park with distances from 4 miles to 50K on scenic singletrack, technical rock sections, and mountain views. Pick a distance and enjoy a mountain trail challenge.

Tackle scenic high alpine trails around Rampart Reservoir on May 16 with distances from 15K up to an epic 55 mile test of endurance. Expect rugged singletrack, big elevation gains, aid stations, a 60K shuttle and finisher awards.

Trail races on YMCA of the Rockies grounds in Estes Park feature looped single-track courses with a steep summit section. Distances include 10k, 27k and 50k, and registrations include a day pass plus hat and wool finisher socks.

Celebrate Memorial Day weekend with the Spirit Trail Race in Buena Vista, Colorado, a scenic trail event with marathon, half marathon and 9k options. Start in town square, enjoy Paddlefest fun, and support local nonprofits.

Run the North Fork 50 Ultras in Buffalo Creek, Colorado on May 30, 2026, with 50 mile and 50K options along scenic soft surface singletrack through ponderosa pine and granite. Enjoy challenging trails while supporting local nonprofits.

Hit alpine single track at Granby Ranch in Granby, Colorado on June 6, 2026 with options from 6 Mile to 50k and a unique Elevation Challenge. Expect rugged scenery, well stocked aid stations, and a lively resort finish.

A looped trail festival at Mueller State Park offering 100 mile, 100k, 50k and 25k races on smooth single and double track, with crew-accessible aid stations, significant elevation, and a night run component.