Trail Running calendar near New Castle 2026-2027

A non repetitive 200 mile loop around Summit County Colorado that reaches high alpine elevations above 9000 feet. The field is limited to 75 runners, with live GPS tracking, aid and sleep stations, and a 110 hour cutoff.

A trail running event in Aspen on August 1, 2026 offering 50K, marathon and heavy half marathon distances on mostly dirt trails, with remote aid stations, high alpine terrain and a finish line festival alongside the Duck Derby.

A trail race on the Frisco Peninsula offering 5k, 10k and half marathon courses with lakeshore finishes, chip timing, stocked aid stations, post-race food and beer, and marked single track and dirt trails.

Emerald Mountain Epic in Steamboat Springs on August 8 and 9, 2026 is a two day mountain bike and trail running weekend on scenic singletrack dirt trails. Race marathon, half or bike distances with a limited field of 500 per day.

The Leadville Trail 10K Run takes place in August 2026. This out-and-back 10k course shares the start and finish of the famous Leadville Trail 100 Run, traveling on paved and dirt roads high in the Colorado mountains. It features one aid st..

A 99.7 mile out and back ultramarathon in Leadville, Colorado, with 11 aid stations, high altitude passes near 12,526 feet, and belt buckle cutoffs at 25 and 30 hours.

A trail half marathon and a mostly downhill 5.6K through Arrowhead, Bachelor Gulch and Beaver Creek. The half covers 13.3 miles with about 2,844 feet of ascent, aid stations on course, postrace food, t shirts and age group awards.

Trail races of 5 mile, 16 mile and 50K on August 29, 2026 in Steamboat Springs. Mountain courses start and finish at Torian Plum Lawn and climb above 10,000 ft with cupless aid stations.

A 40 mile point to point mountain ultramarathon from Crested Butte to Aspen across the Elk Mountains, the Grand Traverse follows the backcountry ski route and raises funds for Crested Butte Nordic while providing mandatory backcountry gear..

A trail race starting at the Rabbit Ears Pass summit near Steamboat Springs at about 10,000 ft, offered as a listed 10 km (actual 6.8 miles) and a 5 km option. Proceeds support Steamboat Nordic and entries are limited by a USFS permit.

Run Rabbit Run in Steamboat Springs offers a limited-field 100 mile race with Hares and Tortoises and a 50 mile race, backed by a substantial prize pool and significant charitable donations.

A trail ultramarathon in Crested Butte, Colorado offering 35K, 55K and 50 mile courses through Gunnison National Forest, with cupless aid stations, downloadable course files, and on site packet pickup at the community school.

A trail race at Hartman Rocks near Gunnison, Colorado, offering 50K, 28K and 15K options on slickrock, singletrack and doubletrack. The course features rolling hills, a high desert climate, and wide mountain views.

The West Elk Challenge is a fall trail marathon and 30k through Colorado's North Fork Valley. Runners ascend through golden aspen forests to Inter-Ocean Pass before finishing in Paonia, with proceeds supporting youth outdoor access.

Emerald Mountain Trail Run in Steamboat Springs on October 3, 2026 features a 12k and a 4 mile course on aspen-lined singletrack. The event concludes the SSRS pointed season and raises funds for the Boys & Girls Club.

This Halloween-themed 5K in Aspen is a timed run or walk where participants can bring their costumed pets. Proceeds support the local animal shelter, and there are cash prizes, costume contests, and food trucks.

Trail races in Fruita, Colorado on November 7, 2026 offering 10 mile to 50 mile distances on singletrack through the North Fruita Desert with mountain and monument views, cupless aid stations, and published course elevation data.