Trail Running calendar near Jackson County 2025-2026

Run the Colleen De Reuck XC Classic in Boulder on November 1, 2025 at Harlow Platts Community Park. Youth and open cross country races celebrate local distance legends and offer scenic fall competition as part of the Boulder XC series.

Run against the clock on a fully supported one mile dirt loop in Fort Collins, Colorado, choosing 6, 12, or 24 hour solo or relay formats. Enjoy an overnight challenge chasing distances from a marathon to an ultra in a friendly setting.

Hit the trails at Louisville Community Park for the 12th annual Louisville Trail Race, with 5K, 10K and half marathon options on scenic dirt trails. Enjoy live split tracking, post race festivities and a cupless sustainability focus.

Challenge yourself in the Thumbs Up Vertical in Estes Park, an 8 hour timed ascent limited to 30 runners. Each 540 ft steep scenic single track lap earns a poker chip, with milestone patches and a prize for the overall winner.

Run the Twin Mountain Trudge in Laramie WY on Jan 10, 2026, choosing a ~10.2 mile single loop or a ~20.5 mile double. Thigh deep snow, ice and about 2,000 feet of climbing make this a rugged winter course that demands proper gear and grit.

USCSA Cross Country Ski Racing Festival, hosted by Colorado Mesa University at Snow Mountain Ranch Nordic Center in Granby, Colorado, on January 24–25, 2026, brings collegiate teams together with junior skiers for a two-day Nordic festival...

Tackle the Sourdough Snowshoe Race in Nederland CO on Jan 31 2026, a donation based backcountry challenge where snowshoes are required for the full route. Choose 18K or 30K and warm up at the finish with hot drinks and a warming tent.

Race The Ranch at Snow Mountain Ranch in Granby Colorado on April 4, 2026 is a scenic snowshoe race with distances up to 50k on singletrack and groomed trails. Tackle challenging loops, enjoy on course aid, and earn a custom finisher mug.

Run the Ranch is a weekend trail festival at Sylvan Dale Guest Ranch in Loveland, CO, featuring 5K, 10K and timed 4, 6 and 12 hour events plus relays and virtual options. Enjoy varied ranch terrain, on course support, meal tickets for entra..

Hit the scenic Great Western Trail in Severance on April 18, 2026 with 5K, 10K, half marathon and kids fun run options for every level. Enjoy chip timing, finisher shirt and medal, plus post race food and beer while supporting local nonprof..

Quad Rock 25 and 50 deliver rugged singletrack and big Colorado climbs around Fort Collins, offering a 25 mile single loop or 50 mile double loop with roughly 5,500 or 11,000 ft of gain. Entries are capped and registration opens Dec 15, 202..

Summits Trail Runs at Granby Ranch Resort on June 6, 2026 offers single track through alpine meadows and aspen groves. Choose distances from 6 mile to 50k or take on the multi loop Elevation Challenge.

Run the Crazy Legs 10k+ at Devils Backbone Open Space in Loveland, Colorado on June 7, 2026. Scenic loop trails, on course aid, and a lively postrace awards celebration at Loveland Aleworks make this a not to miss local trail event.

Enjoy scenic treetop trails and Horsetooth Reservoir views at the Timberview Trail Run in Lory State Park, with 5K, 5 Mile and 10 Mile options for all abilities. This USATF event is 100% plant based and finishes with pancakes and craft beer..

Experience high alpine trails from Gould Colorado in the Never Summer range with 100 km and 60 km options. Rugged singletrack, big climbs and alpine lakes await for a true mountain adventure.

The Summit 200 is a 200 mile loop around Summit County Colorado across high alpine trails and peaks above 12,000 feet. Limited to 100 runners with a 110 hour cutoff, it requires a prior 100 mile finish and fierce self sufficiency.

Join the Wild West Relay, a scenic point to point 200 miles across Colorado from Fort Collins to Steamboat Springs. Run solo or with teams from 1 up to 12 people as you tackle mountain passes, open roads and big western views.

Run the Lory Summer Trail Series in August at scenic Lory State Park with 5k, 10k and 12k options across fast valley and challenging hill routes. Finish with pizza and drinks, grab a free vintage shirt while supplies last, and race for seri..

Run the Rockies Trail in Frisco, Colorado is a scenic 5k, 10k and half marathon on single track and dirt roads with views of Dillon Reservoir and the Ten Mile Range and a lakeshore finish. The half gets new single track in 2026.

Run a scenic marathon or half marathon along the Medicine Bow Rail Trail through the Snowy Range, finishing at beautiful Lake Owen. Timed race with aid stations, souvenirs and medals, with proceeds supporting trail upkeep.