Stone Mill 50 Mile Run

The MCRRC Stone Mill 50 Mile Run is a challenging trail ultramarathon held in Montgomery Village, Maryland. The race covers 50 miles along the scenic Seneca Greenway and Muddy Branch trails, featuring forested, rolling terrain primarily on single-track dirt paths with small stream crossings. While the course generally drains well, some sections may be muddy in wet conditions.

The event fosters a strong community spirit, encouraging participants to volunteer six or more hours with local running clubs or related nonprofits before race day. The race is Trail Sisters approved and honors long-term finishers with commemorative apparel. It offers a unique experience for trail running enthusiasts. Visit the organization's website for the most recent information.