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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 ultramarathon held in Montgomery Village, Maryland. The 50-mile course features scenic routes along the Seneca Greenway and Muddy Branch trails, traversing forested, rolling terrain primarily on single-track dirt paths. Runners encounter small stream crossings and variable trail conditions, including potentially muddy sections after wet weather.

The event emphasizes community involvement, encouraging participants to volunteer six or more hours with local running clubs or related nonprofits before race day. The race starts and finishes at Stedwick Elementary School and honors long-term finishers with commemorative apparel. It offers a unique experience for trail running enthusiasts in the Maryland area. 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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