Logo

Estes Park's Backyard Ultra

Estes Park, United States • 21 Jun 2025

Estes Park's Backyard Ultra is a unique ultra-running event set against the stunning backdrop of Lake Estes, Colorado. Participants must complete a 4.252-mile loop every hour until only one runner remains, who is declared the winner. This format creates an exciting challenge, as there is no predetermined end time.

Each runner receives a custom Fractel hat, access to a stocked aid station, and a designated space in the athlete village. The course features a paved bike trail with a 150-foot elevation gain per loop, and runners switch directions every 12 hours. The event also supports local Childcare and Family Services. Visit the organization's website for the most recent information.

United States Colorado Estes Park

Race information

Website Registration
4 mi
150 m+
Backyard Ultra
Visit the organization's website for the most recent information.
Trail runs nearby

Run The Ranch

Loveland - 23 mi from Estes Park

...

Run The Ranch is an exciting trail running event taking place at Sylvan Dale Guest Ranch in Loveland, Colorado. Scheduled for April 4-5, 2025, participants can choose from various distances, including a 5K, 10K, and multiple timed trail runs ranging from 4 to 12 hours, with options for solo runners..

Quad Rock 50

Fort Collins - 27 mi from Estes Park

The Quad Rock 50 and 25 Mile Trail Races, organized by Gnar Runners, will take place on May 10, 2025, in Lory State Park and Horsetooth Mountain Park, near Fort Collins, Colorado. This event features two challenging courses, with the 50-mile race offering over 11,000 feet of vertical gain and the 25..

Samson's Revenge

Estes Park

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. The race features three distances: 10K, 27K, and 55K, with a challenging course that includes a significant ascent known as the King of the..

Crazy Legs Trail Run

Loveland - 23 mi from Estes Park

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..

Timberview Trail Run

Bellvue - 25 mi from Estes Park

The Timberview Trail Run is a scenic trail running event taking place at Lory State Park in Colorado, featuring three race distances: 5K, 5 Mile, and 10 Mile. Scheduled for June 28, 2025, this event caters to athletes of all levels, including beginners and families, with a beginner-friendly 5K route..

Boulder Rez Marathon

Boulder - 28 mi from Estes Park

The Boulder Rez Marathon is a scenic running event held at the Boulder Reservoir in Colorado, featuring a flat course primarily on dirt roads and trails. Participants can choose from various distances, including a marathon, half marathon, 3/4 marathon, and 10K. The race offers stunning views of the..