Colorado
Colorado Trail Running Calendar 2026-2027
Explore the best trail runs in Colorado for 2026-2027! Our updated list features 146 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
Annual four mile charity run in Eldorado Springs with a scenic out and back course, post-run food and prizes, supporting the Colorado Cancer Foundation.
A point to point 200 mile team relay across Colorado with 36 legs from Fort Collins to Steamboat Springs, offered in multiple team categories on open roads.
A self-directed 100 mile mountain challenge in Lake City, Colorado on August 6, 2027 requiring visits to 24 proof points and a 48 hour cutoff.
Mountain trail races in Winter Park Colorado featuring 50K, 21K and 10K courses on alpine singletrack with limited fields and aid stations.
High-elevation trail event in Fairplay, Colorado offering 50-mile, 50k, and half marathon courses with stocked aid stations and specific pacer and drop bag options.
A 15 mile mountain trail race on August 7, 2027 in the La Plata Mountains, with 3,100 feet of elevation gain and proceeds supporting La Plata County Search & Rescue.
Four Tuesday evening trail races in August at Lory State Park offering 5k, 10k and 12k courses with pizza, series awards, and youth pricing.
Trail races at Rampart Reservoir offering 16 mile and 8 mile courses, shuttle service from Merit Academy, limited parking at Rainbow Gulch, horseshoe finisher medals and a membership raffle.
Trail ultras through Roxborough State Park and Sharptail Ridge with 50 mile and 50K options, five aid stations, bus start access and a field limited to 200.
Trail races of 5K, 10K and half marathon on Frisco Peninsula trails with single track, dirt roads and a lakeshore finish.
A high elevation, technical 50 mile trail race in Ouray, Colorado on August 14, 2027 with required volunteer service, drug testing, and SPOT tracking.
Trail races around Standley Lake in Westminster, Colorado offering five dirt-course distances with aid stations, drop bag access and live split tracking.
A 6.2 mile out and back in Leadville using the first and last 3.1 miles of the LT100 Run course, with one aid station, high elevation and age group awards.
Four Tuesday evening trail races in August at Lory State Park offering 5k, 10k and 12k courses with pizza, series awards, and youth pricing.
Scenic road races in Ouray County, Colorado in August offering marathon, half marathon, 10K and a kids fun run with cupless aid and limited entry.
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 50K, 16M and 5M on high elevation forest trails starting and finishing at Steamboat Ski Area.
A 100 mile high altitude out and back trail run in Leadville featuring Hope Pass near 12,500 feet, a December lottery entry window, and chip time buckle standards.
Trail marathon and half at Staunton State Park in Colorado featuring mostly singletrack, significant elevation gain, marked courses, stocked aid stations, and limited fields.
Four Tuesday evening trail races in August at Lory State Park offering 5k, 10k and 12k courses with pizza, series awards, and youth pricing.