Colorado
Colorado Trail Running Calendar 2026-2027
Explore the best trail runs in Colorado for 2026-2027! Our updated list features 148 exciting trail runs across the region. Find your next trail run in Colorado below and join the trail community at these great events!
October 2026
Run a 4.167 mile loop every hour at 8,000 feet in this mountain endurance race where the last person standing wins a 1,000 dollar prize.
Trail races in Leadville with a 6.66K bike, a 6.66K run, a nonscary 1.5K kids run, and a costume contest supporting CMC teams.
Fundraising run at Red Rocks Park and Amphitheatre on October 11, 2026, supporting lung disease education, advocacy and research in Colorado.
A youth cross country meet at Aurora Sports Park on October 11, 2026 with 2k, 3k, and 4k courses, creek crossings, and awards for the top 10 in each age and gender division.
Indian Creek Trail Runs in Sedalia, Colorado on October 17, 2026 offers multiple trail and ultra distances through montane forests, aspen groves, red rock formations and prairie vistas with city views from several viewpoints.
Trail races at Palmer Park in Colorado Springs offering 50K, 25K, 10K and 5K on marked single-track with city and Pikes Peak views.
Trail marathon and half near Horsetooth Mountain Park featuring Colorado singletrack, rocky sections, fully stocked aid stations, and time limits for each distance.
Experience single track trails and dirt paths at Bear Creek Lake Park with views of the Denver skyline. Enjoy a post race party with food and beverages included in your registration for both the 5 and 10 mile distances.
A 2 mile course at Moon Farm in Fruita where participants carry a pumpkin picked from the patch; pumpkins are included with entry and are weighed and marked beforehand.
A roughly 6.5 mile trail run through Overend Mountain Park in Durango followed by a community Chili Cookoff benefiting The Good Food Collective.
A weekend event in Elbert CO with bike races for women and girls, a family run around the camp, and on-site camping.
A cross-country invitational in Colorado Springs on October 17, 2026 with timed youth and adult races from 2k to 5k and youth awards for top finishers.
A four-race trail series in Colorado Springs with increasing distances across city and county parks, chip-timed scoring, and awards for runners who complete all four.
Single loop trail event in Cañon City with 35 mile 50k 35k and 10k options along the Arkansas River and Royal Gorge.
Traditional Backyard Ultra at Luvin Arms Animal Sanctuary in Erie, CO with repeated 4.167 mile loops on mostly flat off road terrain, on site camps, and rescued animals.
Experience a 2 mile trail race featuring steep elevation changes and scenic views of the South Platte River to benefit McGraw Memorial Park in Bailey.
Trail races at Bear Creek Lake Park on Oct 25 2026 featuring 5 km, 15 km, a 5+15 double and a Kids 1 km. Mostly dirt single and double track with steep climbs, marked courses and included postrace items for adult distances.
MonsterDASH Louisville on Oct 25, 2026 offers a new half marathon plus 5k, 10k and a kids mile with costume contests, expo, and themed runner perks.
A Halloween themed 5k and 10k through historic downtown Erie and Coal Creek trails, with a kids Goblin Run and BOLDERBoulder qualifier status. The event supports the Erie Optimist Club as its primary fundraiser.