Colorado
Colorado Trail Running Calendar 2026-2027
Explore the best trail runs in Colorado for 2026-2027! Our updated list features 139 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 the Rocks is a fundraiser at Red Rocks Park and Amphitheatre on October 11, 2026 offering a 5k and a 1.3 mile run and walk to support lung health 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.
A dog-friendly 2.5 mile loop on a hilly dirt path in Lone Tree raising funds for the Colorado Animal Care Foundation, with prizes for participating dogs.
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 aid stations, drop bags, and no pacers.
Trail marathon and half marathon near Fort Collins featuring redstone singletrack, significant elevation change, fully stocked aid stations, and a finish line meal.
Trail races of 5 miles and 10 miles at Bear Creek Lake Park near Denver, with park admission included, post-run food, and a finisher mug for 10 mile finishers.
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.
Trail run through Overend Mountain Park in Durango on Oct 17, 2026 with an about 7 miles course and an onsite chili cookoff benefiting The Good Food Collective.
A two-day weekend of mountain bike races for women and girls, a family run and on-site camping near Elbert, Colorado with youth and adult categories.
Youth cross-country meet on October 17, 2026 at Monument Valley Park with age-group races on 1k and 2k loops and results posted by HAL Sports.
A four-race trail series across Colorado Springs parks with increasing distances, chip timing, and gift card awards for runners who complete all four events.
Single-loop trail event in Cañon City with river and tunnel sections, high alpine views, extensive singletrack, and multiple distances including 50k and 35 mile.
A traditional Backyard Ultra at Luvin Arms Animal Sanctuary on October 24-25, 2026 with hourly 4.167 mile loops, on-site aid, camping, and proceeds supporting the sanctuary.
Trail events at McGraw Memorial Park include a 2 mile course and a 12.6 mile endurance race made of six repeated 2.1 mile loops with decreasing lap times.
An approximately 18 mile trail across Boulder's five peaks with about 5,000 ft of climbing on October 24, 2026; limited to 100 participants with a $25 fee donated to recovery.
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 13.1 mile trail race through the Highlands Ranch Backcountry Wilderness in Douglas County with cash prizes and participant race amenities including a shirt, medal, and pancake breakfast.