Trail Running Calendar Colorado 2025-2026

Race the Sky Pilots Ouray Backyard Ultra in Fellin Park on May 16, 2026. Complete a 4.167 mile loop each hour until one runner outlasts the rest, with scenic river walk views and supportive aid station service.

Ram Party Trail Runs : May 16, 2026 Ram Party Trail Runs takes place in the Colorado Springs / Woodland Park area with race activity centered around Rampart Reservoir. Distances offered on Saturday are: 55 Mile 60K 50K 24K 15K The event l..

Run rugged single and double track trails at Mueller State Park with distances from 10k to marathon and a playful 12 hour loop where colored balls pick your next lap. One main aid station, scenic views, and on site camping.

North Fork 50 : Event details The North Fork 50 Mile/50K is scheduled for Saturday, May 30, 2026, in Buffalo Creek, Colorado. The start and finish are at the Buffalo Creek Clubhouse, 18050 S Buffalo Creek Rd, Buffalo Creek, CO 80470. Distan..

The Weld Your Mettle Running Festival, held in Eaton, Colorado, is a multi-day event featuring a variety of running challenges for all levels. Participants can choose from solo or relay races lasting 3, 6, 9, 12, 24, or 36 hours, including..

Aiden's Adventure 5k : event overview Aiden's Adventure 5k takes place on Saturday, June 6, 2026, in Colorado Springs, CO. The event includes in-person and virtual options and donates all proceeds to Care and Share of Southern Colorado and..

Enjoy alpine single track through meadows and aspen groves at Granby Ranch Resort with distances from 6 Mile to 50k and a unique Elevation Challenge scored by total climb rather than distance. Small field and stocked aid stations make for a..

Great Divide Ultra in Divide, Colorado on June 6-7, 2026 offers looped 25k to 100 mile trail races in Mueller State Park plus the Dark Divide Night Run. Smooth single and double track winds through rolling meadows with stunning Pikes Peak v..

Run the Crazy Legs 10k+ at Devils Backbone Open Space in Loveland, Colorado, a scenic singletrack course with aid stations and lively local support. Limited spots remain and this is the event's final year, so grab your spot now.

Ring the Springs : event overview Ring the Springs takes place Saturday, June 20, 2026, at Rock Ledge Ranch in Garden of the Gods, Colorado Springs, CO. The event offers trail distances of: 100K : 64 miles 50K : 32.3 miles 35K : 21.5 miles..

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..

Timberview Trail Run is held at Lory State Park in Bellvue, Colorado, just outside Fort Collins. The event offers three distances: 5K, 5 Mile, and 10 Mile (the 10M is a double loop of the 5M). Runners traverse scenic forest trails with view..

Run high in the Rockies at the Life Time Leadville Trail Marathon and Heavy Half in Leadville, Colorado on June 27, 2026. Tackle mountain trails to Mosquito Pass above 13,000 feet and chase Leadville Trail 100 qualifying spots.

Race in the Clouds - Alma Dirt Festival 2026 The Race in the Clouds - Alma Dirt Festival is a multi-sport outdoor event held in Alma, Colorado in 2026. The festival base is Alma Cemetery Meadow, at about 10,600 ft elevation and roughly half..

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..

Event overview The Silverheels Trail Runs take place July 10-11, 2026, with start/finish operations based at the Como Roundhouse in Como, CO. Distances offered include: 100-Mile 100k 50-Mile 60k 19-Mile 10-Mile Runner capacity is limited:..

Hardrock Hundred is a legendary 100 mile ultramarathon through Colorado's San Juans, with about 33,000 feet of climbing and avg elevation 11,000 feet. Rugged trails, alpine scenery and a fierce community make it a must do mountain race.

Take on the Silver Rush 50 in Leadville, Colorado, a scenic trail and dirt road 50 mile mountain challenge with about 7,500 feet of climb and a high point near 12,024 feet. Top finishers can earn a Leadville Trail 100 qualifier coin.

Grin & Bear It is a rugged trail run and mountain bike event in Crested Butte featuring a challenging 25 km loop with big climbs and a long descent plus a 15 km run to Green Lake. Expect high alpine views, rocky singletrack and minimal aid.

High Lonesome 100 is a rugged 100 mile mountain loop in Colorado, crossing five alpine passes and sections of the Continental Divide and Colorado Trail. Mid July racing delivers big climbs, sweeping alpine views, and a true endurance test.