Trail Running Calendar Colorado 2026-2027

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 hilly trail 5k at Lory State Park on August 18, 2026 with about 700 feet of elevation gain, a 100-runner cap, chip timing, and pizza and beverages provided after the race.

A four‑race midweek trail series at Lory State Park in August 2026 offering 5k, 10k and 12k courses with varied elevation. Series and per-race registration, post-race food and drinks, and end-of-series awards for top points scorers.

The Rocky Mountain Milestone Challenge will take place in Granby from Wednesday 19 August 2026 to Sunday 23 August 2026. You can run between 13 and 100 miles.

A 200 mile loop race through the La Garita mountains, starting and finishing in South Fork, CO, with a short out and back section and high points near 13,000 feet.

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.

Trail-based chip timed half marathon and 5K near Fraser, Colorado, on unpaved roads and trails, with aid stations and proceeds supporting the Shining Stars Foundation.

A trail race at Staunton State Park offering 26.3 mile and 13.1 mile courses over mostly singletrack with significant elevation gain, well marked trails, capped fields, and fully stocked aid stations.

Mountain races in the San Juan Mountains around Telluride with five technical routes up to 65 miles and sections above 13,000 ft.

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.

Seven cross country races at Spring Canyon Park in Fort Collins, including high school and middle school events plus a community 5K, with proceeds supporting Rocky Mountain High School Cross Country.

Four trail races in Evergreen range from 5K up to a half marathon, with varied meadow and mountain courses, shuttle service at Alderfer, and onsite amenities.

A four-date midweek trail series at Lory State Park with races from 5k to 12k; the August 25 Eltuck Valley 12k is a mostly flat 12 km course with post-race pizza and beverages.

Trail races in Castle Rock Colorado offering 50K, 25K, 10K and 5K on Miller Park and Ridgeline trails with aid stations and live timing.

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 community trail event at the Arapahoe County Fairgrounds on 08/29/2026 with a 5K run, a family 5K walk that allows leashed dogs, and a kids 1 mile plus demonstrations, vendors, and a pancake breakfast.

Run Like the Wind in Allenspark on August 29, 2026 features a 5K race, a 2K run/walk and a dog jog option. Proceeds benefit The Old Gallery and participating dogs are entered in an amateur dog show.

A high elevation 50 mile mountain ultramarathon in Ouray, Colorado with 23,582 feet of gain, required volunteer service, SPOT tracking, and drug tested podium 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 multi day ultra on a 2 mile loop in Loveland offering time based and distance races with round the clock aid and on site camping.