Trail Running calendar near Louisville 2026-2027

A four race trail series at the Argo trails in Idaho Springs, Colorado, held June to September 2026. Each event is about 5 miles with 785 feet of gain on non technical, runnable trails with visual finish timing.

Looped trail races at Barr Lake State Park in Brighton Colorado offer 50K, 30K, half marathon, 15K and 5K options on dirt surfaces with lake and Front Range views. Aid station coverage varies by distance.

Experience up to three miles of messy fun at the Colorado National Speedway. Navigate obstacles by crawling wading and sliding through the mud with friends and family during this unique event in Dacono.

Trail 10K and 5K races in Beaver Creek on June 20, 2026 with a kids run, aid stations, post race food and age group awards. The event benefits the Vail Valley Charitable Fund.

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.

Summer Vibes Bike Rally & Run Festival in Lyons Colorado pairs gravel and road bike rallies with trail running, relays, live music, recovery pools and camping for a combined endurance and festival weekend.

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.

Experience a high altitude outdoor festival in the highest incorporated town in North America featuring trail running mountain biking and duathlon. Enjoy a weekend of racing and meadow camping surrounded by 14,000 foot peaks.

Experience the beauty of Lory State Park at this USATF sanctioned trail race featuring 5K, 5 mile, and 10 mile distances. Enjoy scenic foothill views, plant-based post-race pancakes, and unique wooden medals.

An overnight endurance event in Highlands Ranch, Colorado offering solo and team relay options on a 10.3 miles dirt loop beneath a full moon. Two aid stations, drop bags, medical support and a headlamp requirement are provided.

A lap-based backyard ultra around Lake Estes in Estes Park, Colorado. Each lap is 4.252 miles on a paved bike trail with 150 feet of gain, repeated hourly until one runner remains; aid, a custom hat, and athlete village space are provided.

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 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 mountain trail race on July 5, 2026 in Vail, Colorado covering 12.2 km with about 2,128 feet of climb, starting at Vail’s Mountain Haus and finishing at Mid-Vail. Aid stations, race shirts, awards and postrace refreshments are provided.

Experience high altitude trail running through historic Colorado ghost towns and mines at over 10000 feet. Choose from distances ranging from 10 miles to 100 miles in the scenic South Park Valley.

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.

Mountain trail races on Vail Mountain at 10,000 feet with rerouted 10K and 5K courses, gondola access to the start, aid stations and finish food, age-group awards, t-shirts and a post-race raffle.

An endurance event on the Thumb Open Space trail in Estes Park that runs from sunrise to sunset. Participants repeat a 1 km out and back loop, collect poker chips at each turnaround, and earn milestone pins and awards.