Stone Mill 50 Mile Run

NOV
13
2027
A 50 mile trail race on the Seneca Greenway and Muddy Branch trails near Montgomery Village, MD, over forested single-track dirt with small stream crossings.
Sat 13 Nov 2027
50 miles

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Stone Mill 50 Mile Run

The Stone Mill 50 is a 50 mile trail race in Montgomery County, Maryland, based at Stedwick Elementary School in Montgomery Village. The route uses sections of the Seneca Greenway and Muddy Branch trails.

The course runs through forested, rolling terrain and is primarily single-track on dirt trail. Runners will encounter small stream crossings. Most of the course drains well, though some sections can be muddy in wet weather.

This event is designated an RRCA National Championship Event. RRCA awards top performers in the open, masters (40+), grand masters (50+), and senior grand masters (60+) categories for both men and women.

Venue details: Stedwick Elementary School, 10631 Stedwick Road, Montgomery Village, MD 20886, United States.

Event categories listed for the race include Race and Winter. Visit the organization's website for the most recent information.

Events nearby

A 5K cross country race and 1 mile fun run at Ida Lee Park on November 21, 2026, featuring shirts, medals, awards and a canned food drive for Loudoun Hunger Relief.
Community cross country 5K in Herndon on November 21 with age group awards, commemorative shirts for the first 400 pre registered runners, and a canned food collection for LINK.
A small, capped fall race on the C&O Canal towpath at Great Falls Tavern offering a half marathon, 10K and family friendly 5K with chip timing and live tracking.
Trail race at Riverbend Regional Park near the Potomac offering 5 mile and 10 mile loop options with riverside singletrack, aid stations, and post race food.
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