Trail Running Calendar Colorado 2026-2027

A high altitude out and back through Leadville's historic mining district, the Silver Rush 50 Run covers about 50 miles with substantial elevation gain and a 14 hour cutoff. The weekend also includes a 15 mile race, a juniors 5K, and LT100..

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 mountain ultramarathon in Ouray, Colorado, featuring about 41,862 feet of elevation gain and 14 climbs. Entrants must complete volunteer service or pay a $100 opt out; top finishers face drug testing for cash prizes.

Experience a high altitude 100 mile loop through the Colorado Rockies featuring 23,300 feet of gain. Run across alpine passes and historic ghost towns on the Continental Divide and Colorado Trails within a 37 hour limit.

Mountain trail races in Silverton, Colorado on July 18, 2026 feature a 50K loop, marathon, and 8.4 mile out-and-back along the Alpine Loop, passing ghost mining towns and reaching about 12,926 feet with aid stations and chip timing.

A mountain trail race at Powderhorn Mountain Resort on July 18, 2026 offering a steep 5K with over 1,500 feet of climb and a 15K that repeats the ascent. Registration includes resort entry, shirt, finisher item, food, and a lift pass.

Trail races on Spring Creek Trail in Steamboat Springs featuring a 9.5 mile scenic loop with about 1,750 ft gain and a rolling 5K out and back, plus a prize drawing and a post-race meal by Freshies.

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.

Mountain trail races on Vail Mountain at 10,000 feet with rerouted 10K and 5K courses, gondola access to the start, aid stations and finish food, age-group awards, t-shirts and a post-race raffle.

An endurance event on the Thumb Open Space trail in Estes Park that runs from sunrise to sunset. Participants repeat a 1 km out and back loop, collect poker chips at each turnaround, and earn milestone pins and awards.

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.

A three day, fully supported trail running stage race in Leadville, Colorado that crosses the Continental Divide between Hope Pass and Red Cliff. Offers a 51 mile Full Pint and a 35 mile Half Pint with a field limited to 500 runners.

High-elevation trail races in Silverton, Colorado offering a 12 mile summit route with a final 300 foot scramble and an 11 km out and back to Deer Park, on jeep roads with aid stations and cupless refills.

Experience a true mountain ultra through the rugged alpine peaks and lakes of Northern Colorado. Navigate technical trails and high ridges across 60km or 100km courses in a wild wilderness setting.

Pikes Peak Ultra in Colorado Springs features 20K, 30K, 50K and 50 mile trail courses from Bear Creek Regional Park with substantial elevation change, cupless aid stations, and published maps and GPX files for each distance.

An ultra running event in Creede offering 50 mile and 100 mile courses across the San Isabel and Rio Grande National Forests over two days, organized by Tempest Adventures under a USDA Forest Service permit.

Grand Mesa Ultras on July 25, 2026 offers 50 mile, 55K and 30K trail races on high elevation mountain terrain with camping options, finisher awards, cash prizes, a raffle, food and beer.

Mountain trail races in Telluride, Colorado offering a high alpine 30K with about 5,800 ft of gain and a 10 mile with about 3,500 ft of gain, both on mixed double track and singletrack with alpine views.

A single-day trail event at Staunton State Park offering a 5k distance with on-site vendors, recreation activities, and food. Registration is not yet open online and the race is cup-free with water refill available.

Experience a historic Colorado tradition where runners and burros compete together. Navigate mountain trails and high altitude passes while carrying traditional mining gear in this unique world championship event.