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 2026
A chip timed 5k at The Winery At Holy Cross Abbey in Canon City featuring a mixed paved and cross country out and back course. Registration includes a T shirt, collapsible wine glass, finisher medal and a pour of wine, and the event supports Royal Go..
September 2026
A multi day ultra on a 2 mile loop in Loveland offering time based and distance races with round the clock aid and on site camping.
A 40 mile point to point ultramarathon from Crested Butte to Aspen with 6,000 feet of climbing, mandatory backcountry gear, aid stations, and shuttle support.
The Cirque Series at Arapahoe Basin on Sept 5, 2026 is a 9.4 miles mountain trail race with 2,211 ft of ascent on approved White River National Forest trails. The field is capped at 600 runners and includes a branded hat, bib and medal.
Trail races through Creede Colorado's San Juan Mountains offering 2 Mile, 12 Mile, 22 Mile and 50K routes on high elevation terrain with exposed alpine sections.
Join the community for a 5K run or walk on a brand new dirt course at the North Arvada Middle School Athletic Complex. Support local high school racers before taking on this off road route yourself.
A load bearing endurance event at Staunton State Park on September 5, 2026. Routes range from 6.5 to 21.5 miles with loads from 10 to 40 lb and proceeds benefit the Special Forces Foundation.
Experience a high altitude trail run starting at 10,000 feet on Rabbit Ears Pass. Runners navigate a mix of forest roads and single track trails with 1,200 feet of elevation change through scenic Colorado terrain.
A remembrance event in Longmont, CO on a flat 1.05 mile loop offering multiple races including a 100 mile option and finisher awards.
Memorial 5K run and ruck on Reservoir Hill in Pagosa Springs with just under 1,000 ft of elevation change and awards for 10 lb and 40 lb pack finishers.
A demanding 17.1 mile mountain trail race connecting Ouray and Telluride over the high altitude Imogene Pass. This event features steep rocky terrain and strict cutoffs for prepared athletes.
A longstanding Nederland, Colorado running event offering a 5K road run, a 10K trail, and a trail half marathon, with family-friendly features, on-leash dogs allowed in the 5K, and costume encouragement.
A multi-distance trail running festival at YMCA of the Rockies in Granby, CO offering 50K, 33K, half, 10K and 5K on dirt and grass trails with looped courses.
Experience the scenic trails of Lory State Park in this 13.5 mile mountain race featuring technical singletrack and stunning Rocky Mountain views. Enjoy a well supported course followed by a celebratory pancake breakfast at the finish.
A high altitude trail race in Empire Colorado with 50K and 22K point to point dirt courses, sold out for 2026 with a 50K waitlist open.
Trail Sisters Women's Half Marathon and 10K in Buena Vista, Colorado, feature trail courses through sagebrush and ponderosa pines with views of the Collegiate Peaks, and offer both group and solo participation options.
Trail races on Meadow Mountain near Minturn CO: an 11K and 5K over singletrack and dirt trails with aid stations, age-group awards, and finish-line food for participants.
Low-key trail running event in Loma, Colorado offering Half Marathon, Marathon (26.2 Miles) and 50 Miler with a flat $50 entry fee. Registration runs April 5 to August 1, and participants may change distance on race day.
A free supported training run in Castle Rock with 16-mile and 10-mile route options, community support, sponsors, and on-site vendors.