Rocky's Backyard Ultra

Estes Park, United States • 4 Oct 2025

Rocky's Backyard Ultra is an exciting ultra trail running event held at the YMCA of the Rockies in Estes Park, Colorado. Participants must complete a 4.167-mile loop every hour until only one runner remains, who is declared the winner. The course features stunning Rocky Mountain scenery, with approximately 500 feet of elevation gain per lap. The event includes a cash prize for 100-mile finishers and offers amenities such as a stocked aid station and access for crew members. With unpredictable October weather, runners can expect a unique and adventurous experience amidst the beautiful fall landscape. Visit the organization's website for the most recent information.

Race information

4 mi
500 m+
4.167 Miles
Visit the organization's website for the most recent information.
Trail runs nearby

The Thumbs Up Vertical Challenge is an exciting running event held at the Thumb Open Space in Estes Park, CO. Participants will embark on an 8-hour ascent along a 1km out-and-back trail, gaining 540 feet in elevation. Runners must collect poker chips at the turnaround point to track their progress, ..

Santa's Summit Slam is a versatile running event that takes place in various weather conditions, featuring a 5-mile course that includes 30% gravel roads and 70% single-track trails. Participants can expect a unique experience, whether running on dry trails, navigating sloshy paths with traction spi..

Samson's Revenge is a trail running event held at the YMCA of the Rockies in Estes Park, Colorado, honoring the legacy of Samson, a famous elk poached in 1995. Participants can choose from three distances: 10K, 27K, and 55K, featuring a challenging course with significant elevation gain, particularl..

The Crazy Legs 10k+ Trail Run is an exciting running event taking place at Devil’s Backbone Open Space in Loveland, Colorado, on June 1, 2025. This trail run features a challenging course designed to provide a fun experience for participants. Runners will navigate through various trails, with water ..

Estes Park's Backyard Ultra is a unique ultra-running event set against the stunning backdrop of Lake Estes, Colorado. Participants must complete a distance of 4.252 miles within one hour, every hour, until only one runner remains. This format continues indefinitely, with the last runner standing be..

The Timberview Trail Run is an exciting annual event held at Lory State Park in Colorado, featuring three race distances: a 10-mile, a 5-mile, and a 5K trail run. Scheduled for June 28, 2025, this event welcomes participants of all ages and skill levels, offering a scenic course with stunning views ..