Trail Running calendar near Erie 2026-2027

A four-race midweek trail series at Lory State Park in August 2026 offering 5k to 12k courses, timed by chip with series points and end of series awards. Pizza and beverages follow each race and vintage shirts are available.

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

A community benefit trail event in Castle Rock with a 5K and a 1 Mile Walk raising funds for a family affected by spinal muscular atrophy.

Trail run at Rampart Reservoir with 8 mile and 16 mile options on single track and rocky sections. Entry is limited to 150 and registration closes August 5, 2026.

Community 5K and kids mile in Strasburg on a 2.5 loop mixed surface course, serving as a fundraiser for the local SHS cross country team.

A hilly 10K trail race at Lory State Park in Bellvue, Colorado, featuring about 1,700 feet of elevation gain, a 100-runner cap, chip timing, and post-race pizza and beverages as part of a midweek series.

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.

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

A mostly dirt and trail race along Boulder Reservoir in Boulder, Colorado, with about 200 feet of elevation gain. Distances range from a 10K to a full marathon, plus a relay option.

Two fully supported trail ultras in Roxborough State Park with technical singletrack, significant elevation gain, and a finish at the Sharptail Trailhead.

Westminster Trail Races on August 15 2026 offers multiple trail distances around Standley Lake on packed dirt with lake and mountain views.

Summit Grays and Torreys Peaks in this 8.8 mile Colorado endurance event. Participants must carry a 20lb dry load while tackling 4,101 feet of elevation gain.

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.

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.

Trail races at Curt Gowdy State Park near Cheyenne with 4 and 8 mile courses that climb from about 7,300 to 7,700 feet amid reservoirs and granite formations.

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.