Stone Mill 50 Mile Run

NOV

7

2026

The Stone Mill 50 Mile Run is a trail race on the scenic Seneca Greenway and Muddy Branch paths in Maryland. Runners traverse forested, rolling terrain on single-track dirt trails. Participants are asked to commit to volunteer hours prior to the event.

Sat 7 Nov 2026

Gaithersburg, Maryland

Website

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Event Details

The MCRRC Stone Mill 50 Mile Run is a trail run in Montgomery County, Maryland. The course takes place on the Seneca Greenway and Muddy Branch trails.

Course Description

The route is a 50-mile trail run. It travels through forested, rolling terrain on a primarily single-track, dirt trail. There are small stream crossings. Most of the course drains well, but some sections can become muddy in wet weather.

Additional Information

The race has a single distance. The event has a registration fee, with an early price of $65.00. Registration opens on May 1, 2026. The event organizers ask participants to commit to volunteering for 6 or more hours with a local running club, race, trail work group, or running-related non-profit before race day. This is based on an honor system with no proof required. Visit the organization's website for the most recent information.

50 Mile Run