Trail Running calendar near Brighton 2026-2027

A non repetitive 200 mile loop around Summit County Colorado that reaches high alpine elevations above 9000 feet. The field is limited to 75 runners, with live GPS tracking, aid and sleep stations, and a 110 hour cutoff.

Experience the Wild West Relay, a scenic point to point 200 mile run from Fort Collins to Steamboat Springs. Solo runners and teams of every size are welcome, with live GPS tracking and a mountain finish at Steamboat Springs Ski Resort.

Run a scenic mountain 50K or 10K from Winter Park Resort into town with flowing singletrack, aspen groves and views of the Continental Divide. Expect changing high altitude conditions, full aid stations and a finisher award.

A four‑week August trail race series at Lory State Park featuring 5K, 10K and 12K options with varied elevation. Post‑race pizza and beverages are provided and series awards go to top points scorers.

A trail race on the Frisco Peninsula offering 5k, 10k and half marathon courses with lakeshore finishes, chip timing, stocked aid stations, post-race food and beer, and marked single track and dirt trails.

A midweek trail race at Lory State Park, the 10 km course is part of an August series and features about 1,700 feet of elevation gain, chip timing, series points and postrace pizza and beverages.

A four‑week August trail race series at Lory State Park featuring 5K, 10K and 12K options with varied elevation. Post‑race pizza and beverages are provided and series awards go to top points scorers.

Run along Boulder Reservoir on flat, mostly dirt trail courses with sweeping Rocky Mountain views. Choose from 10K, 3 4 marathon, half, full marathon or relay, with USATF certified courses, a shirt and a finisher medal.

Roxborough Ultras features 50K and 50M all trail ultramarathons in Roxborough State Park with sustained climbing, technical terrain, and big elevation gain. August is hot and dry with limited shade and spaced aid stations, so carry water an..

A midweek trail 5k at Lory State Park in Bellvue, Colorado, presented as part of an August series. Chip timing, series points and awards, free vintage shirts for registrants, and pizza and beverages after each race.

A four‑week August trail race series at Lory State Park featuring 5K, 10K and 12K options with varied elevation. Post‑race pizza and beverages are provided and series awards go to top points scorers.

Trail races in Fraser, Colorado on August 22, 2026, offering a Half Marathon and a 5K on unpaved roads and trails. Proceeds support the Shining Stars Foundation and dogs are allowed on leash.

Explore the historic and scenic singletrack trails of Colorado's Staunton State Park. Choose between a full marathon or a half marathon on a high-altitude course with generous time cut-offs. The event includes well-stocked aid stations and..

A four‑week August trail race series at Lory State Park featuring 5K, 10K and 12K options with varied elevation. Post‑race pizza and beverages are provided and series awards go to top points scorers.

Trail races on the Miller Park and Ridgeline trails in Castle Rock offering 50K, 25K, 10K and 5K with aid stations, drop bag support, chip timing and live split tracking; proceeds support local open space and trail efforts.

A family-focused trail event at Arapahoe County Fairgrounds on August 29, 2026, featuring a 5K run, a family 5K walk and a kids 1 mile run. The day includes dog demonstrations, a costume contest, auctions, vendors and a pancake breakfast.

A mountain trail race at Arapahoe Basin on September 5, 2026 covering *9.4 miles* and *2,211 ft* of ascent, with Sport, Expert and Pro divisions, a 700 runner cap, on course aid stations and category prizes.

A remembrance running event in Longmont, Colorado on September 11 and 12, 2026 featuring loop course races from 5K to 100 miles and a virtual option. The event includes aid stations, participant shirts, finisher awards, and on site food for..

Ned Ned Run in Nederland Colorado features a trail Half Marathon, a 10K on dirt roads and single track, and a 5K out and back near Old Town. The event is family friendly, allows leashed dogs in the 5K, and encourages costumes.

Snow Mountain Ranch in Granby Colorado features trail races from 5K to 50KM across dirt trails with varied elevation and mountain views. Loop courses include aid stations, drop bag access, onsite lodging, and a pacer option for the 50KM fin..