Colorado
Colorado Trail Running Calendar 2026-2027
Explore the best trail runs in Colorado for 2026-2027! Our updated list features 144 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 200 mile loop race on August 26, 2027 through the La Garita mountains, starting and finishing in South Fork, Colorado.
A mountain running event in the San Juan Mountains with five route options, high alpine terrain, and finishes centered in Telluride.
September 2027
Multi day ultrarunning event in Loveland Colorado with looped course, timed and distance races, on site camping, chip timing, and a 150 runner cap.
A 40-mile point-to-point ultramarathon from Crested Butte to Aspen across the Elk Mountains with 6,000+ feet of climbing, mandatory gear, aid stations, and mandatory tracking.
A 13.5 mile trail half in Lory State Park near Fort Collins, Colorado, with about 2,000 ft of elevation and a separate 1 mile kids race.
Mountain road race between Ouray and Telluride with strict cutoff times, recommended cold-weather gear, free bus transport, and limited pre-registration.
Two mountain trail ultramarathons in Steamboat Springs, Colorado featuring 50 and 100 mile courses and a record prize purse with community fundraising.
All-Out Fall Fest on September 18, 2027 at Standley Lake in Westminster CO offers in-person and virtual Half Marathon, 10K, and 5K and benefits BookGive.
A multi-distance trail running festival on September 18, 2027 at Snow Mountain Ranch in Granby, CO, featuring dirt Nordic trails, notable elevation gain, aid stations, and live tracking.
A 13.3 mile race from Manitou Springs to the 14,115 foot summit of Pikes Peak with 7,800 feet of climb and wave based starts determined by submitted results.
Expo Park XC in Aurora, Colorado is a grass cross country meet featuring creek crossings, bale jumps, and youth races across multiple distances.
Tough Mudder Colorado at Fort Carson on September 25 2027 features 15K and 5K obstacle courses, finisher gear, Mudder Village spectator passes, and group packages.
Community driven 24 hour loop race in Palmer Lake CO on a 0.82 mile course at 7,240 feet, with awards and buckles for 100 mile finishers.
Mountain trail festival near Westcliffe Colorado offering multiple distances, wilderness running on the Rainbow Trail, and on site camping on 09/25/2027 to 09/26/2027.
Elevation Everest in Winter Park, CO offers half and full formats on September 25, 2027 with measured lap distances and a 17 hour time cap.
A multi-day trail running weekend in Red Feather Lakes with 50 Mile, 50K and Half Marathon courses on marked singletrack, on-site camping, aid stations and local wildlife.
Trail ultramarathon in Crested Butte, Colorado on September 25, 2027 featuring 50 Miler, 55K and 35K distances.
October 2027
A last person standing Backyard Ultra on a 4.17 mile singletrack loop in Western Colorado with hourly laps and finisher buckles for completed distances.