Trail Running calendar near New Castle 2026-2027

A two-day multi-distance run and hike in Snowmass Village offering 3.76k, 5k and a single 10k with an 18.76k challenge and a post-race New Belgium brew.

Trail races of 5K, 10K, and half marathon on Frisco Peninsula trails with lakeshore finishes at Dillon Reservoir on August 8, 2026.

Two day mountain bike and trail running event in Steamboat Springs on August 8 and 9 2026. Multiple distances from a 52 mile solo bike to 26.2 and 13.1 mile runs, with proceeds supporting local youth and trail organizations.

A traditional pack-burro race in Leadville, Colorado at over 10,000 feet where each team is one runner and one burro carrying mining tools. The long course is about 21 miles and a shorter 6 to 8 mile course is planned.

Trail run on August 12, 2026 at Carter Park in Breckenridge offering short and long course entries with adult youth and non binary categories.

Backyard Ultra at Loudy Simpson Park in Craig, Colorado where runners repeat a 4.167 mile loop every hour until one remains; a single-loop Citizens Race is offered.

A 10K out and back on the first and last 3.1 miles of the LT100 Run in Leadville, featuring high altitude terrain and one aid station at the turnaround.

A 100 mile out-and-back ultramarathon in Leadville with over 15,000 feet of ascent, high alpine passes, 11 aid stations, a lottery entry and belt buckle finish traditions.

A mountain trail event at Arrowhead on August 22, 2026 offering a 13.3 mile half marathon with 2,844 ft gain and a mostly downhill 5.6K.

Trail races held from the Torian Plum Lawn in Steamboat Springs offering 50k, 16 mile and 5 mile options across high alpine terrain with cupless aid stations, limited crew access, and awards including finisher mugs and age group prizes.

A 5k trail run at Copper Mountain starting at 11,000 feet, held during the Union Peak Festival with music and festival activities afterward.

A 40 mile point to point mountain ultramarathon from Crested Butte to Aspen with over 6,000 feet of elevation gain and mandatory backcountry gear; a fundraiser for Crested Butte Nordic.

Experience a high altitude trail run starting at 10,000 feet on Rabbit Ears Pass. Runners navigate a mix of forest roads and single track trails with 1,200 feet of elevation change through scenic Colorado terrain.

Trail races on Meadow Mountain in Minturn CO offering 11K and 5K courses with aid stations, finish refreshments, age group awards and an afterparty.

Low-key trail running event in Loma, Colorado offering Half Marathon, Marathon (26.2 Miles) and 50 Miler with a flat $50 entry fee. Registration runs April 5 to August 1, and participants may change distance on race day.

Scenic mountain races in Marble, Colorado on September 13 2026 offering a 25K loop, an 8 mile Quarry Climb, and a kids 2.5K with post race BBQ; proceeds benefit Marble Charter School.

Two days of trail ultramarathons in Steamboat Springs offering 100 mile and 50 mile distances, limited fields, time cutoffs, and a $100,000 prize purse.

A mountain ultramarathon in Crested Butte, Colorado on September 26, 2026, offered in 35K, 55K and 50 mile distances. Courses run through Gunnison National Forest with single track trails, alpine meadows, cupless aid stations, and on course..

A half marathon from Fanny Hill in Snowmass along the Government Trail through aspen groves to Koch Lumber Park in downtown Aspen.

A point to point trail race from Vail to Minturn with 26K and 14K options across Vail Mountain, high alpine singletrack, staffed aid stations and postrace awards.