Trail Running calendar near Aurora 2025-2026

Take on the Crazy Legs 10k trail run through the scenic Devil's Backbone Open Space in Loveland on June 7, 2026. Limited spots, marked trails, and a post race celebration at Loveland Aleworks make this a fun mountain running day.

Experience the Barr Lake Trail Race on June 13, 2026 in Brighton, Colorado, with scenic dirt trails and sweeping views of Barr Lake and the front range. Choose distances from 5K to 50K and enjoy a supportive, eco friendly race day with park..

Ring the Springs offers 35K, 50K and 100K trail distances through Garden of the Gods and Pike National Forest, starting at Rock Ledge Ranch. Expect big climbs, varied terrain, aid stations and stunning mountain views.

Run scenic trails at Lory State Park with sweeping views of Horsetooth Reservoir and the foothills. Choose from 10 mile, 5 mile or 5K courses at a USATF sanctioned, 100% plant based event with aid stations and medals.

Race in the Clouds at Alma Cemetery Meadow is a high country weekend of mountain bike, trail and off road duathlon racing at 10,600 feet. Multiple distances, youth events and on site camping create a true alpine festival vibe.

Explore alpine single track at the Silverheels Trail Runs in Como, Colorado on July 10 and 11, 2026, with distances from 10 miles to 100 miles. Limited entries, stunning mountain views, and a buckle for 100 mile finishers.

Take on the Barr Trail Mountain Race in Manitou Springs, Colorado, a rugged 12.6 miles up to Barr Camp on Pikes Peak terrain and back to the trailhead. Part of the Garden to Peak Challenge, this summer favorite fills fast so register early.

Pikes Peak Ultra on July 25, 2026 in Colorado Springs offers 20K, 30K, 50K and 50 mile options across scenic trails with big climbs and summit views of Pikes Peak and Mt Rosa. All finishers get a custom shirt, BOCO trucker hat and medal.

The Summit 200 is a 200 mile loop from Frisco, Colorado, over high alpine trails and forest roads with nearly 40,000 feet of ascent. Limited to 100 runners and with remote aid, this epic self reliant race has a 110 hour cutoff.

Join the Wild West Relay, a scenic point to point 200 miles across Colorado from Fort Collins to Steamboat Springs. Run solo or with teams from 1 up to 12 people as you tackle mountain passes, open roads and big western views.

Tackle high alpine trails at Sheep Mountain Trail Runs in Fairplay, Colorado on August 1, 2026, with options for a half marathon, 50k, or 50 mile. Expect rocky county and forest roads, aid stations, big views, and a supportive festival vibe..

The Lory Summer Trail Series will take place in Bellvue from Wednesday 5 August 2026 to Wednesday 26 August 2026. You can run between 5 and 12 kilometers.

Run the Rockies Trail in Frisco, Colorado offers 5k, 10k and half marathon on scenic single track and dirt trails. Take in views of Dillon Reservoir and the Ten Mile Range with a lakeshore finish to cheer your arrival.

Experience scenic high altitude trail running in Fraser, Colorado at the Byers Peak Stampede Half Marathon and 5K, a fundraiser for the Shining Stars Foundation. Tackle a challenging half above 9,500 ft or enjoy a dirt road 5K.

Staunton Rocks! Marathon and Half deliver high altitude singletrack through Staunton State Park, offering sweeping mountain views, alpine wildlife, and serious vertical gain. With just 150 spots per distance, this rugged trail run fills fas..

Challenge yourself on the scenic rolling trails of Philip S. Miller Park in Castle Rock at Rock Hawk Trail Races on August 29, 2026, with 50K, 25K, 10K and 5K distances. Organized by Aravaipa Running, the event supports local open spaces an..

Challenge yourself on the Cirque Series at Arapahoe Basin on September 5, 2026 in Keystone, Colorado. This scenic 9.4 mile mountain course with 2,211 ft of climbing delivers steep, technical trail and big alpine views in a capped field.

Ned Ned Run in Nederland Colorado blends scenic trail and road running through the foothills, offering a half marathon, 10K and fun 5K for all abilities. Family friendly and costumes encouraged, with leashed dogs welcome in the 5K.

Explore scenic mountain trails at Snow Mountain Ranch in Granby Colorado with distances from 5K to 50K, rolling singletrack and big alpine views. Take on the Moosehead or Baby Moose challenge for extra bragging rights.

Experience the Black Squirrel Half Marathon at Lory State Park near Fort Collins on September 12, 2026. This 13.5 mile trail course features rolling singletrack with sweeping reservoir and mountain views and a pint glass plus pancake breakf..