Trail Running calendar near Nathrop 2026-2027

Trail races in Colorado Springs with 100K, 50K and 35K courses that start and finish at Rock Ledge Ranch in Garden of the Gods, featuring significant elevation gain, aid stations, and on course support.

A trail run at Creekside Park on June 20, 2026 offering 10K and 5.2K courses as part of the Vail Trail Running Series; the race benefits the Vail Valley Charitable Fund and features aid stations, finish-line food, awards, and on-site maps.

A summer and early fall series of four half marathons and a 25K across Colorado in 2026, with options to enter three, four, or all five events; races include Estes Park, Georgetown to Idaho Springs, Mt Sneffels, Ned Ned, and Lead King Loop.

At 10,600 feet in Alma, Colorado, Race in the Clouds is a June 25 to 28 Dirt Fest featuring mountain biking, trail running, off road duathlon, youth races and meadow camping, with USA Triathlon sanctioning and age group awards.

Trail marathon and Heavy Half on historic mining roads and single track, topping out at Mosquito Pass 13,185 feet. Distances are 26.4 miles and 15.46 miles with aid stations, chip timing, and limited crew access.

Alderfer 5K Trail Race at Alderfer Ranch in Evergreen Colorado is a 5 km trail event with shuttle service from Wulf Rec Center. The course is cup free with no aid stations, and water and refreshments are available at the venue.

A professional pack burro race in Cripple Creek during Donkey Derby Days, featuring a 6 mile urban course, chip timing, checkpoint support, animal welfare rules, on-site activities and monetary awards.

A downtown Leadville Fourth of July 5K held above 10,000 feet, with adult fees rising from $25 to $30 after July 2 and free entry for youth 17 and under. Proceeds support local youth athletics and recreation.

A historic uphill trail race on Vail Mountain covering about 12.2K (7.6 miles) with 2,128 ft of gain, three aid stations, on-course hydration and a Mid-Vail finish with awards by age group.

Experience high altitude trail running through historic Colorado ghost towns and mines at over 10000 feet. Choose from distances ranging from 10 miles to 100 miles in the scenic South Park Valley.

Trail running and mountain biking near Crested Butte with 15 km and 25 km options. Courses include alpine climbs to near 11,000 ft, limited aid stations, and non traditional prize drawings.

A high altitude 50 mile out-and-back in Leadville on July 11, 2026 featuring about 7,500 feet of climbing and a 12,024 foot high point. The event also offers a 15 mile race, a juniors 5K, and serves as an LT100 qualifier.

Experience the STRS Horseshoe Gulch Grind in Breckenridge with short and long course options. This trail event offers categories for adults and youth starting from the Blair Witch Trailhead.

A 100 mile loop in Colorado’s Sawatch Range, the High Lonesome 100 covers about 23,300 feet of elevation gain and includes long sections on the Continental Divide and Colorado Trail with a 37 hour cutoff.

A two day festival in Centennial Park, Cañon City on July 17–18, 2026 featuring whitewater competitions and land based events. The program includes running and mountain bike races, raft rodeo, SUP activities, cardboard boat races and a ween..

Experience the mountain trails of Aspen Snowmass with three distinct race distances. Runners can choose between a 50K trek across four mountains a 25K trail run or a 10K course starting from the Elk Camp Gondola.

High-altitude trail races on Vail Mountain offering 10K and 5K courses that start near Gondola One, feature singletrack and gravel sections, on-course aid stations, post-race refreshments, and age-group awards.

A community trail event at Ranch Camp with organized 5k and 10k courses, water stations, medical support, sliding-scale registration, and post-race tie-dye and crafts for finishers.

A summer mountain trail race in Manitou Springs, Colorado, covering *12.6 miles* up Barr Trail to Barr Camp and back. The event is run under a Pike National Forest permit and is part of the Garden to Peak Challenge.

TransRockies Run is a three day stage race in Moab, Utah on July 19 to 21, 2026, offering two distance options called Half Pint and Full Pint along with a race guide and supporting event information.