Trail Running calendar near Golden 2026-2027

Two Brothers Up and Down in Idaho Springs offers two uphill out and back races on mixed dirt and paved roads, with steep sections and an aid station on the 10k. Both races start and finish at Courtney Riley Cooper Park.

A four-race August trail series at Lory State Park in Fort Collins featuring 5k, 10k and 12k courses with chip timing, series points and end-of-series awards. Post-race pizza and beverages are provided.

Trail races on Frisco Peninsula offering 5k, 10k and a half marathon with single track and lakeshore finishes, marked courses and aid stations on the longer distances. Awards by overall and age categories and a post race plaza gathering.

Historic pack burro race in Leadville, Colorado at over 10,000 feet, with a long out and back of about 21 miles toward Mosquito Pass and a shorter 6 to 8 mile course. Teams pair one runner with one burro.

Experience a focused trail run through the hills of Lory State Park with 1,700 feet of elevation gain. Enjoy a post-race social with pizza and beer in a scenic outdoor setting limited to 100 participants.

A four-week midweek trail series at Lory State Park in August featuring short trail races of 5K, 10K, and 12K with varied elevation profiles. Post-race pizza and beverages are provided and series awards go to top point scorers.

A running event at Carter Park in Breckenridge on August 12, 2026 offering short and long course entries in Adult, Youth and Non-Binary Open divisions with published entry fees.

A multi-distance race at Boulder Reservoir, Colorado, featuring a mostly dirt and trail course with about 200 feet of elevation gain and views of the reservoir and the Rocky Mountains.

Two trail ultramarathons run from Roxborough State Park to Sharptail Trailhead, covering 50.2 miles and 31.1 miles. Routes feature sustained climbs, technical singletrack, and a long runnable descent with on-course support and stewardship e..

Experience the trails of Cheyenne Mountain State Park with three race distances ranging from a 5K walk to a 25K mountain challenge. This chip timed fundraiser supports park conservation through scenic and high elevation courses.

A trail race at Standley Lake in Westminster, Colorado offering 50K, 35K, Half Marathon, 10K and 5K on packed dirt trails with lake and Front Range views. The event includes on-site music, drop bag areas, and live split tracking.

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 high altitude 100 mile out and back ultramarathon around Leadville Colorado, with over 15,000 feet of elevation gain and a high point at Hope Pass. Aid stations, drop bag locations, and pacers are part of the race structure.

A 6.2 mile out-and-back using the opening and closing miles of the LT100 Run course, the Leadville Trail 10K features paved and dirt roads at high elevation with one turnaround aid station and on-course nutrition from Neversecond and Skratc..

Experience a hilly 5k trail race through the scenic Lory State Park. Enjoy a low key atmosphere followed by pizza, beverages, and a vintage race shirt in this midweek summer series event.

A four-week midweek trail series at Lory State Park in August featuring short trail races of 5K, 10K, and 12K with varied elevation profiles. Post-race pizza and beverages are provided and series awards go to top point scorers.

A 60 hour endurance challenge at Snow Mountain Ranch where runners repeat a 10 mile trail loop to reach milestone distances. Entry includes lodging, meals, training and recovery services.

Experience a high altitude trail run through the Rocky Mountains on 100 percent unpaved roads and trails. This dog friendly event in Fraser supports children facing cancer through the Shining Stars Foundation.

Experience high altitude trail running through the scenic singletrack and historic landmarks of Staunton State Park. Choose between a full or half marathon featuring sweeping mountain views and a festive post-race meal.

Trail races in Arrowhead, Colorado on August 22, 2026 include a 13.3 mile half marathon with 2,844 ft of climbing and a mostly downhill 5.6K. Courses run mostly on single track and finish at Arrowhead Village with awards and post race food.