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!
May 2027
A weekend outdoor festival in Fruita, CO with multi-distance races, clinics, kids events, camping, and merchandise organized by Gemini Adventures.
A 13.8 mile loop trail half in the North Fruita Desert with flowy singletrack, nearly 1,000 ft of climbing, three aid stations and spring desert scenery.
Trail races at Mueller State Park from 10k to marathon plus two 12 hour timed events that use colored ball draws to set loop sequences. All courses are single and double track with no pavement and feature an aid station.
A 14 miles loop around Vallecito Lake in Colorado with mixed surfaces, cupless aid stations, free race photos and a post race lunch with live music while proceeds support local nonprofits.
Trail races at YMCA of the Rockies on May 22, 2027 offering 10K, 25K, and 50K on mostly runnable singletrack at 8,000 feet; the 50K includes 6,000 feet of gain.
A weekend of Spartan obstacle races at Fort Carson, Colorado, featuring events from 5 km up to 50 km on steep, high-elevation trails with multiple obstacle counts.
A trail race in Buena Vista on May 30, 2027 offering marathon, half-marathon and 9k distances at the South Main Town Square. The event coincides with CKS Paddlefest and donates to several local nonprofit organizations.
June 2027
A multi day running festival in Eaton Colorado featuring races from 7K to 100 miles, relays, a ruck event, virtual options, glamping, sauna and on site entertainment.
Trail races at Granby Ranch Resort in Colorado on June 12, 2027, across multiple distances including a 14-hour Elevation Challenge scored by total elevation climbed. The event uses mountain single-track, aid stations, drop bags, and has a 250 runner..
Experience a scenic downhill race through the Rocky Mountains with distances ranging from a 5 mile run to a full marathon passing the historic Stanley Hotel.
San Juan Solstice 50 Mile Run is a 50 mile ultramarathon scheduled for June 20, 2026, with lottery registration open from January 15 to January 31.
A three-day high-elevation dirt festival in Alma Colorado featuring mountain bike races, off-road duathlon, trail runs, family kids races and on-site camping.
Trail races at Lory State Park offering 10 mile, 5 mile and 5K routes with scenic foothill views, aid stations, biodegradable cups and wet weather alternate courses.
July 2027
A running event in Buena Vista on July 4, 2027 offering 5K and 3K races with registration open 12/31/2026 through 05/05/2027; fee $25.
Mountain trail races near Como Colorado at over 10,000 feet with distances from 10.8 miles to 106.2 miles and alpine scenery.
A 100-mile loop ultramarathon around Silverton, Colorado, with 66,882 feet of elevation change and high alpine terrain on trails and 4WD roads.
An approximately 50 mile out and back mountain run near Leadville with about 8,000 feet of elevation gain and LT100 qualifier status.