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!
August 2027
A mountain road running event in Ouray County on August 21, 2027 featuring a half marathon, 10K and a kids fun run on mostly dirt roads.
Trail-focused half marathon and 5K in Fraser, Colorado, on unpaved roads and trails, with chip timing and proceeds benefiting the Shining Stars Foundation.
Trail races in Steamboat Springs on August 21, 2027 featuring a 50K, 16 mile and 5 mile course with substantial elevation gain and sections above 10,000 ft.
A 100 mile out and back trail ultramarathon in Leadville, Colorado, reaching Hope Pass near 12,500 ft with aid stations, crewing and a lottery for entry.
A four race midweek trail series at Lory State Park in August 2027 offering 5K, 10K and 12K options, post race food and beverages, and series awards.
September 2027
A multi-day ultrarunning event in Loveland, Colorado, featuring looped timed and distance races, 24/7 aid, camping, and mileage buckles.
A 13.5 mile trail half around Lory State Park near Fort Collins with mostly singletrack, about 2,000 feet of elevation change and a 5.5 hour cutoff.