Colorado
Colorado Trail Running Calendar 2026-2027
Explore the best trail runs in Colorado for 2026-2027! Our updated list features 144 exciting trail runs across the region. Find your next trail run in Colorado below and join the trail community at these great events!
July 2027
A running event in Buena Vista on July 4, 2027 offering 5K and 3K races with registration open 12/31/2026 through 05/05/2027; fee $25.
Mountain trail races near Como Colorado at over 10,000 feet with distances from 10.8 miles to 106.2 miles and alpine scenery.
A 100 mile loop around Silverton, Colorado through high alpine terrain with about 66,882 feet of elevation change, entry by lottery and a dedicated scholarship program.
Silver Rush 50 Run is a 50 mile mountain course in Leadville with about 8,000 feet of elevation gain and serves as a qualifier for the Leadville Trail 100 Run.
A Crested Butte trail event with 15 km and 25 km run options plus a technical 25 km mountain bike race, featuring alpine climbs and a Green Lake turnaround.
A 100 mile mountain ultramarathon in Ouray, CO, featuring 41,862 feet of gain, mandatory volunteer service, SPOT tracking, and cash prizes subject to drug testing.
A 100 mile loop through Colorado’s Sawatch Range with 23,300 feet of gain, five alpine passes, and long sections on the Continental Divide Trail and Colorado Trail.
Experience a historic 12.6 mile mountain race ascending Pikes Peak from Manitou Springs to Barr Camp and back through the Pike National Forest.
Trail races on July 17, 2027 in Silverton, Colorado offering 50K, a marathon and an 8 mile out and back on the historic Alpine Loop through ghost mining towns.
A mountain trail event in Silverton with a 12 mile summit route featuring a 300 foot scramble and an 11K jeep road out and back.
Trail ultramarathon in Colorado Springs offering 20K, 30K, 50K and 50 mile courses with high-elevation routes, crushed granite trails, and a cupless aid station system.
A 69-mile three-loop mountain event near Nederland, Colorado with 18,099 ft of climbing, strict weight classes, mandatory high-altitude kit and GPS verification for awards.
A 100-mile mountain ultramarathon in Creede, Colorado featuring high-elevation single track, a 25-mile Continental Divide section, and limited entry.
Three-day trail stage race in Leadville, Colorado, with Full Pint (51 mi) and Half Pint (35 mi) options and a 500-runner limit.
A single 200 mile loop around Summit County, Colorado with about 40,000 ft of climb, high alpine sections, live GPS tracking and a 109 hour cutoff.
A trail race day in Aspen on July 31, 2027 offering 50K, marathon and heavy half-marathon on high-alpine dirt trails with limited aid and a finish-line festival.
Two Brothers Up and Down in Idaho Springs features steep out and back courses: a 10k with about 1,800 ft ascent and a 5k with about 570 ft.
August 2027
A roughly 104 miles mountain ultramarathon near Durango, Colorado with about 19,000 ft of climbing, GPX navigation, required safety gear, and a 38 hour cutoff.
Four Tuesday evening trail races in August at Lory State Park offering 5k, 10k and 12k courses with pizza, series awards, and youth pricing.