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
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.
Backyard ultra at Bear Creek Lake Park where runners repeat a 4.16-mile loop each hour until one remains or the field is stopped at the 11th hour.
November 2026
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.
Trail ultramarathon in Fruita Colorado with multiple distances on singletrack through high desert terrain and significant elevation change.
A 13.1 miles trail race through the Highlands Ranch Backcountry Wilderness on November 7, 2026, with cash prizes and participant shirt, medal, breakfast, and post race beer.
Timed 6, 12 and 24 hour individual and relay events on a flat USATF certified one mile dirt loop at Swift Ponds in Fort Collins with full aid and lodge access.
A six hour timed trail event on an 8 mile loop at Sandstone Ranch in Larkspur, Colorado with aid every four miles and loop based medals.
A lap-based endurance event in Mancos, CO with 6- and 12-hour formats, team divisions, a Hot Lap contest, and free entry with suggested donations.
Trail run and hike at Starsmore Visitor Center offering a chip timed 4 mile and an untimed 2.5 mile course, with proceeds benefiting Friends of Cheyenne Cañon.
Trail races on November 14, 2026 in Louisville CO offering Half Marathon, 10K and 5K on dirt out and back courses with aid stations and post-race festivities.
Trail races in Loveland, CO offering a roughly 13-mile half marathon with a 5-hour limit and a shorter 5K on varied, mixed-terrain trails.
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.