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Stone Mill 50 Mile Run

Gaithersburg, United States • 8 Nov 2025

The MCRRC Stone Mill 50 Mile Run is a challenging trail running event set in Montgomery County, Maryland, showcasing the scenic Seneca Greenway and Muddy Branch trails. Participants navigate a primarily single-track dirt course featuring forested terrain and small stream crossings, with some areas prone to mud in wet conditions. The event encourages community involvement, asking runners to volunteer with local running organizations prior to race day. The race is recognized as a Trail Sisters approved event and offers commemorative items for finishers based on their years of participation. The next run is scheduled for November 8, 2025. Visit the organization's website for the most recent information.

United States Maryland Gaithersburg

Race information

Website Registration
UTMB 50K
50 mi
50 Mile
Visit the organization's website for the most recent information.
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