Trail Running Calendar Colorado 2026-2027

A 10k+ trail race on the Devil's Backbone trails in Loveland, Colorado, the 2026 edition is announced as the final running; the looped course uses Hidden Valley, Hunter Loop, Laughing Horse, and Wild Loop with an aid station near 3 miles.

A mountain trail *10K* on Vail Mountain at nearly 9,000 feet with varied terrain, two cupless aid stations and a mass-start format. The race includes multiple age categories from 12+ and a $12,200 prize purse.

A multi-distance trail event at Barr Lake State Park on June 13, 2026 featuring dirt loop and out and back courses with continuous lake and Front Range views and modest elevation gain.

Trail races of 8 and 4 miles on the single-track trails of Howelsen Hill and Emerald Mountain near Olympian Hall in Steamboat Springs. The loop climbs via Lupine trail, has one main aid station, and awards top finishers.

Races on June 14, 2026, through the sandstone formations of Garden of the Gods Park in Colorado Springs. Options include a 10 Mile, two 10K races (road and trail) and a 2.9 mile Youth Classic; registration windows and fees vary.

A four-race running series in Winter Park, Colorado, from June 14 to August 22, 2026. Events range from a family 5K to half marathons and are scored by a points system with Open Men and Open Women categories.

A three-day Leadville training camp (June 19-21, 2026) with guided day and night runs, course sections, expert discussions, on-course nutrition, and event swag; minimum age 17 and general registration is sold out.

San Juan Solstice 50 Mile Run on June 20, 2026 uses MAProgress live tracking; entry was by lottery with 300 registered and 285 on the waitlist. All runners must carry a registered tracker which can be owned, borrowed, or rented.

Trail races at Rock Ledge Ranch in Garden of the Gods offer 100K, 50K and 35K routes through North Cheyenne Cañon and Pike National Forest, with significant elevation gain, aid stations, and specific crew and pacer rules.

The Muddy Dash - Denver will take place in Dacono on Saturday 20 June 2026.

Trail races at Creekside Park in Beaver Creek on June 20, 2026 feature 10K and 5K courses plus a kids fun run. New course routes will be marked and aid stations provide water and Skratch hydration.

Test your strength at this exclusive obstacle course event in Peyton featuring a three lap 3K race and a one mile kids run. Navigate rigs, rope climbs, and heavy carries in a small field of only fifty athletes.

A one day festival in Lyons Colorado combining gravel and road bike events, trail running races, live music, pool areas and camping. Distances include 100K and 50K gravel rides plus a 5 mile run and several relays.

Four Colorado mountain events include four half marathons and a 25K across June to September 2026, totaling 67.9 miles. The series is coordinated by HAL Sports with nonprofit organizers supporting local youth programs.

A community-focused trail festival in Gold Hill, Colorado, with 28K, 12K, 5K and Kids 1K races, a shuttle from Boulder, and proceeds supporting wildfire preparedness for the town.

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.

A rugged, mostly off-trail 50k around Silverton, CO, with about 19,000 ft of ascent and a roughly 19-hour cutoff. Entry is limited and restricted to club members with proven mountain navigation experience.

Trail races at Lory State Park on June 27, 2026 featuring 10 mile, 5 mile and 5K courses with treetop views of Horsetooth Reservoir and aid stations using biodegradable cups and dog water bowls.

A high altitude trail marathon and 15.46 mile Heavy Half through Leadville’s historic mining district, topping out at 13,185 feet on Mosquito Pass. General registration is sold out and a waitlist is available.

Chase the Moon is an overnight fixed time trail event in Highlands Ranch, Colorado with solo 12, 6 and 3 hour races, a 50K and three and five person relays. Runners complete marked loops on dirt trails with aid stations and drop bag support..