Trail Running calendar near Keystone 2026-2027

A weekend trail running festival in Mueller State Park offering 100 mile, 100k, 50k and 25k looped races on smooth single and double track. The event includes night running options, crew access at aid stations, shuttled parking for shorter..

A 10k-plus trail run at Devils Backbone Open Space in Loveland, CO, on a looped, flour-marked course with one aid station passed twice. Parking requires a park pass, finishers get a placing token, and awards follow at Loveland Aleworks.

A trail race at Barr Lake State Park in Brighton, CO offering 50K, 30K, half, 15K and 5K on flat, 100% dirt courses with loop and out-and-back formats. The event uses a cupless policy and includes state park parking fees.

A trail race at Howelsen Hill in Steamboat Springs on June 13, 2026 featuring 8 mile and 4 mile single track loops on Emerald Mountain. Proceeds benefit the Knights of Columbus and awards and a prize raffle follow the race.

On June 14, 2026 in Colorado Springs, the Garden of the Gods event offers a 10 Mile, 10K and a trail run through 300-foot sandstone formations around Balanced Rock. Registration opens March 1, 2026.

Join the Leadville Trail 100 Run Camp in Leadville, Colorado, June 19 to 21 for a three day preview of the LT100 course. Enjoy guided day and night runs, gear demos, shuttles and recovery services for a full race ready experience.

Trail running at Garden of The Gods in Colorado Springs with 100K, 50K and 35K courses. Routes use Midland Trail, North Cheyenne Cañon, and Pike National Forest, with significant elevation gain and staffed aid stations.

Multi day mountain bike and trail running festival in Alma, Colorado, June 25 to June 28, 2026. The program includes multiple bike distances, a trail half marathon, an off road duathlon, free kids races and on site camping at 10,600 feet.

Trail races in Leadville, Colorado that follow historic mining roads and single track and top out at Mosquito Pass at 13,185 feet. Distances include 26.4 miles and 15.46 miles, with multiple aid stations and on course nutrition.

Celebrate July 4th with the Rendezvous Run for Independence, a community 5K run or walk in Winter Park, CO. Enjoy scenic Fraser River Trail views and finish at the Rendezvous Event Center for postrace refreshments, awards and prizes.

A Fourth of July 5K in downtown Leadville, CO on July 4, 2026; youth entry is free and proceeds support local youth athletics.

High Trails Retreat in Buena Vista July 9 to 12 2026 offers daily runs of 10 to 20 miles and an optional Hope Pass or Sawatch 14er climb. Stay riverside, share meals, relax by the river and pick routes with the group.

Multi distance trail event in Como Colorado on July 10 and July 11 2026, with courses above 10,000 feet ranging from 10 Mile to 100 Mile. Routes include single track, fire roads, historic mining terrain, and a point to point 100k.

A historic Crested Butte trail event on July 11 2026 offering a 25 km loop, a 15 km out and back, and a mountain bike route with alpine climbs, a Green Lake checkpoint, limited aid, and a required minimum water carry.

A high-altitude 50-mile out-and-back in Leadville with about 7,500 feet of gain, seven aid stations, off-site parking with shuttles, and LT100 qualifier coins; shorter 15-mile and juniors 5K options are also offered.

The High Lonesome 100 is a 101-mile mountain ultra through the Sawatch range. Runners traverse the Continental Divide, pass ghost towns, and climb over five alpine passes with 23,500 feet of total gain. This loop course offers a mix of sing..

Two trail races in Steamboat Springs on July 18, 2026: a 9.5 mile loop with significant climbing and rocky single track, and a 5k out and back on rolling two track. One aid station on the longer course, cupless event, prize raffle and post..

Run scenic mountain trails around Aspen Snowmass at the Audi Power of Four Trail Run on July 18, 2026. Choose from 10K, 25K or an epic 50K and enjoy challenging terrain, alpine views and Audi supported race day energy.

Join the historic Barr Trail Mountain Race in Manitou Springs and test your legs on a scenic 12.6 mile out and back up Pikes Peak's Barr Trail. Classic summer mountain running with community support and stunning alpine views.

A three-day, fully supported trail stage race across the Colorado continental divide with Full Pint and Half Pint options, nightly camps, meals, showers and athletic therapy. Limited to 500 runners.