Stone Mill 50 Mile Run
Gaithersburg, United States • 8 Nov 2025
Event overview
The MCRRC Stone Mill 50 mile Run is scheduled for Saturday, November 8, 2025, in Montgomery Village, Maryland (zip 20886). The event is a trail race open to ages 18 and older. Registration is open with a current entry fee of $68.12 (includes a $3.12 processing fee); the price increases after August 31, 2025.
Course, participation and other details
The course uses the Seneca Greenway and Muddy Branch trails in Montgomery County. It runs on forested, rolling terrain and is primarily single-track dirt trail. Runners will encounter small stream crossings. Most of the course drains well, but some sections can be muddy in wet weather. The race base is listed at Stedwick Elementary School, 10631 Stedwick Road, Montgomery Village, MD.
Participants are asked, on the honor system, to commit to at least six hours of volunteer service before race day with a local running club, a local race, trail work, or another running-related nonprofit. The event recognizes multi-year finishers with commemorative items: a sweatshirt for 5-year finishers, a vest for 15-year finishers, and a 10-year recognition listed as TBD. Valued sponsors include Tailwind Nutrition, MCRRC, and Cloudsplitter Coffee. Visit the organization's website for the most recent information.