Colorado
Colorado Trail Running Calendar 2026-2027
Explore the best trail runs in Colorado for 2026-2027! Our updated list features 149 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 four-date midweek trail series at Lory State Park with races from 5k to 12k; the August 25 Eltuck Valley 12k is a mostly flat 12 km course with post-race pizza and beverages.
An evening social hike, run, or ride on Lunch Loop Trailhead in Grand Junction to watch sunset and the full moon, with headlamps and free mini flashlights provided.
Trail races in Steamboat Springs on August 29, 2026 offering 50k, 16 mile and 5 mile courses with high-elevation climbs and a cupless aid station policy.
A community trail event at the Arapahoe County Fairgrounds on 08/29/2026 with a 5K run, a family 5K walk that allows leashed dogs, and a kids 1 mile plus demonstrations, vendors, and a pancake breakfast.
A community running event in Allenspark with a timed 5K, a 2K walk/fun run, dog entries for $5, and proceeds supporting The Old Gallery.
A high altitude 50 mile mountain race in Ouray, CO with 23,582 feet of climbing, mandatory 8 hours volunteer service or $100 opt out, and live SPOT tracking.
A 5k trail run starting at 11,000 feet in Center Village Copper Mountain on August 29, 2026, presented by Mammut as part of the Union Peak Festival.
Free timed 5K in Lafayette at Waneka Lake with nearby parking; strollers allowed, dogs restricted, and concessions and T shirt sales support the Centaurus Cross Country Team.
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.
Multi-distance running weekend in Longmont, CO on a flat 1.05-mile loop, offering in-person and virtual options plus awards and on-site aid.
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.