Derby
Trail Running Calendar near Derby 2026-2027
Explore the top trail runs near Derby for 2026-2027! We've gathered 25 exciting trail runs in the area. Check out our detailed list below to find your next local trail run.
September 2026
A remembrance event in Longmont, CO on a flat 1.05 mile loop offering multiple races including a 100 mile option and finisher awards.
Community 5K, 1 mile fun run and a dog friendly 3.1 mile course on Second Creek Trail supporting Every Child Pediatrics in Commerce City on 09/19/2026.
October 2026
A multi-distance trail weekend at Bear Creek Lake Park offering 100K to 5K courses on mostly singletrack with aid stations, drop bags, pacer rules and live split tracking.
Trail races in Louisville CO with 5k, 10k, a new half marathon and a family Pretzel Mile plus an Oktoberfest post race festival.
OUTLAST Denver is a six hour trail challenge where runners complete a 5K every hour, earn patches or a medal for laps, and can place on a national leaderboard.
Fundraising run at Red Rocks Park and Amphitheatre on October 11, 2026, supporting lung disease education, advocacy and research in Colorado.
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.
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.
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.
Test your endurance at Bear Creek Lake Park by completing a 4.167 mile trail loop every hour for up to 11 laps in this modified backyard ultra.
November 2026
Experience 13.1 miles of singletrack trails and hills in the Highlands Ranch Backcountry Wilderness Area. Enjoy custom medals and a post race pancake breakfast while competing for cash prizes in various categories.
Trail races in Louisville, Colorado on November 14, 2026 offering Half Marathon, 10K and 5K on out-and-back dirt trails with aid stations and limited onsite parking.