Trail Running calendar near Aurora 2026-2027

Muddy Dash in Denver is a 5K mud run at Colorado National Speedway on June 20, 2026, featuring obstacles, mud pits no deeper than waist level, a pre-party with music, and an after-party with food and beer. Family friendly with standard and..

Test your strength at this exclusive obstacle course event in Peyton featuring a three lap 3K race and a one mile kids run. Navigate rigs, rope climbs, and heavy carries in a small field of only fifty athletes.

A one-day festival in Lyons on June 20, 2026 that combines gravel and road bike rallies, several trail runs, live music, camping and on-site pools. Featured formats include a 100K enduro, a 50K rally and a 5 mile run.

A multi-event Colorado series of four half marathons and a 25K across summer 2026, organized by HAL Sports with races run by local nonprofits. Participants may register for three, four, or all five events.

A community-focused trail festival in Gold Hill, Colorado, with 28K, 12K, 5K and Kids 1K races, a shuttle from Boulder, and proceeds supporting wildfire preparedness for the town.

At 10,600 feet in Alma, Colorado, Race in the Clouds is a June 25 to 28 Dirt Fest featuring mountain biking, trail running, off road duathlon, youth races and meadow camping, with USA Triathlon sanctioning and age group awards.

Timberview Trail Run on June 27, 2026 at Lory State Park in Bellvue Colorado offers three trail distances: 5K, 5 mile and 10 mile. Courses run among treetops with views of Horsetooth Reservoir and Fort Collins.

Chase the Moon is an overnight fixed time trail event in Highlands Ranch, Colorado with solo 12, 6 and 3 hour races, a 50K and three and five person relays. Runners complete marked loops on dirt trails with aid stations and drop bag support..

A backyard ultra on the paved Lake Estes trail where runners complete 4.252 mile loops each hour until one runner finishes a loop alone. The event records yards for DNFs and offers on-site aid and athlete village space.

Experience a half marathon in the mountains of Nederland Colorado. This event features a significant elevation gain of 4226 feet with the summit always in view.

A 5k trail race at Alderfer Ranch in Evergreen, CO with a course through Alderfer/3 Sisters Park. Shuttle service runs from Wulf Rec Center and on-site vendors, games, and food are available. Internet registration is not yet open.

A professional pack burro race in Cripple Creek during Donkey Derby Days, featuring a 6 mile urban course, chip timing, checkpoint support, animal welfare rules, on-site activities and monetary awards.

A 5K run/walk in Winter Park, Colorado following the Fraser River Trail from Gondola Plaza to the Rendezvous Event Center, with an after party featuring refreshments, awards and prize giveaways.

A high altitude trail running event in Como and Grant, Colorado offering ultras and shorter trail distances across alpine meadows, single track and historic mining terrain, with aid stations, drop bag options, crew and pacer rules.

Experience the STRS Horseshoe Gulch Grind in Breckenridge with short and long course options. This trail event offers categories for adults and youth starting from the Blair Witch Trailhead.

Repeating 2 km out and back laps on the Thumb Open Space trail in Estes Park. Participants collect a poker chip at each turnaround and the most chips wins during a sunup to sundown timeframe; 35 spots and a $100 entry fee.

A community trail event at Ranch Camp with organized 5k and 10k courses, water stations, medical support, sliding-scale registration, and post-race tie-dye and crafts for finishers.

A summer mountain trail race in Manitou Springs, Colorado, covering *12.6 miles* up Barr Trail to Barr Camp and back. The event is run under a Pike National Forest permit and is part of the Garden to Peak Challenge.

Pikes Peak Ultra in Colorado Springs features 20K, 30K, 50K and 50 mile trail courses from Bear Creek Regional Park with substantial elevation change, cupless aid stations, and published maps and GPX files for each distance.

A 10 mile trail race at Staunton State Park on July 25, 2026 with no aid stations on course, a cup free policy, and on site vendor tents and recreational activities for spectators.