Trail Running Calendar Colorado 2025-2026

Niwot's Challenge in Sedalia on May 2, 2026 is invitation and acceptance only, not a race, testing rugged off trail navigation and self sufficiency across punishing loops with massive elevation gain. Traditional entries rely on map and comp..

Take 5 in the Garden invites runners to explore Garden of the Gods in Colorado Springs with road and trail distances. Enjoy traffic free courses past red rock formations and views of snow capped Pikes Peak.

Take on the Collegiate Peaks Trail Run in Buena Vista, Colorado on May 2, 2026, a rugged mountain course along the Arkansas River. Choose 25 miles or 50 miles and tackle big elevation changes on scenic single track and jeep trails.

The Pilgrimage is a 150 hour ultra in Colorado's high desert where runners repeat five off road routes about 55 miles per circuit. Only 45 spots and crewed or uncrewed divisions share a single home base with basic support.

Join the Valkyrie Trail Race on May 9, 2026 at Cheyenne Mountain State Park for a women focused day of stunning singletrack, rocky descents and springtime views. Distances from short runs up to 50K ultramarathon welcome all levels.

Adventure Fest at 18 Road in Fruita CO on May 9 to 10, 2026 is a weekend of mountain bike, gravel and trail running action with camping and a lively community vibe. Bring the crew for clinics, kids races, guided trips and evening awards.

The Quad Rock 50 will take place in Fort Collins from Saturday 9 May 2026 to Sunday 10 May 2026. You can run between 25 and 50 miles.

Enjoy the Fruita Trail Half, a 13.8 mile singletrack loop in the North Fruita Desert with nearly 1,000 feet of climbing, switchbacks and striking butte views. Part of Adventure Fest, it starts and finishes at the same scenic trailhead.

Run scenic single track and forest roads around Rampart Reservoir at Ram Party Trail Runs in Colorado Springs on May 16, 2026. Choose from 15K up to a 55 mile test of grit, enjoy awards, high alpine views and on site lodging.

Join the Spirit Trail Race in Buena Vista on May 24, 2026 for marathon, half marathon or 9K during Memorial Day weekend and CKS Paddlefest. Scenic start at South Main Town Square and proceeds support local conservation and community groups.

Run the 50 Mile or 50K in Buffalo Creek Colorado on scenic singletrack through ponderosa pines, granite outcrops and burn areas. Proceeds support North Fork Volunteer Fire Department and finishers get food, drinks and a commemorative award.

Summits Trail Runs in Granby Colorado on June 6, 2026 offers multiple distances and a timed Elevation Challenge scored by total climb on looped laps. Enjoy mountain views, well stocked aid stations and a unique finisher medal.

Loopy trail weekend at Mueller State Park near Divide, Colorado, with smooth single and double track through meadows and Pikes Peak granite. Choose 100 mile, 100k, 50k, 25k or the Dark Divide Night Run with strong aid and crew access.

Join Aiden's Adventure 5k at Fountain Creek Regional Park for a relaxed, family friendly trail fun run with a virtual option and a kids mile. Enjoy crafts, a butterfly release, food trucks and community vibes while supporting local charitie..

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.

Run scenic dirt trails around Barr Lake State Park, with continuous lake and Front Range views. Distances range from a 5K up to a challenging 50K, with looped courses, aid stations on longer laps and a cupless race policy.

San Juan Solstice 50 Mile Run is an ultramarathon scheduled for June 20, 2026. The event features a 50-mile course, with a dedicated course info page and an alternate course option, underscoring a challenging yet community-focused atmospher..

Experience epic high country trails around Garden of the Gods in Colorado Springs with 35K, 50K and 100K options featuring big climbs, stunning views and challenging singletrack. Limited to 400 runners on June 20, register by June 15.

The John Cappis is a challenging endurance peakbagging event held near Silverton, Colorado, featuring a roughly 50k course with about 19,000 feet of elevation gain. Participants summit multiple peaks in the rugged San Juan Mountains, naviga..

Run scenic trails at Lory State Park with sweeping views of Horsetooth Reservoir and the foothills. Choose from 10 mile, 5 mile or 5K courses at a USATF sanctioned, 100% plant based event with aid stations and medals.