Buttermilk Mountain Backyard Bash
Brunswick, United States • 9 May 2026
Buttermilk Mountain Backyard Bash
The Buttermilk Mountain Backyard Bash is a backyard-style ultra race held at the Kate Furbish Preserve East in Brunswick, Maine. The event takes place on coastal trails featuring a mix of single and double track paths. The course incorporates Buttermilk Mountain, which reaches an elevation of 121 feet.
The competition follows a specific backyard format where participants run a 4.17 mile lap every hour on the hour. To remain in the race, runners must finish each loop within the one-hour window. The event has a 12-hour cutoff time, allowing for a maximum total distance of 50 miles. Participants have the option to run as many or as few loops as they choose within these parameters.
- 50 Miles (Maximum)
This event is self-supported, and nutrition is not provided for participants. The race location is approximately a 12-minute drive from the Bowdoin College campus. Registration fees are collected to cover race expenses, with all remaining proceeds donated to the Preble Street nonprofit organization. The preserve offers a natural setting for trail running on the Maine coast. Visit the organization's website for the most recent information.