Race Information


The 2014 Stone Mill 50 Mile race will be held on Saturday,Nov 15th at 6:00am. Registration opened 8/1.

REGISTRATION UPDATE:The race is now 80% full.


To Volunteer Click Here

2013 Race Results Here.

The Stone Mill 50 Mile is a 50 mile trail run on the Seneca Greenway and Muddy Branch trails in Montgomery County Md. The course traverses forested,rolling terrain. The course is primarily on single track dirt. There are small stream crossings. Most of the course drains well,but parts can be muddy in wet weather.

Parking at Watkins Mill HS (Start/Finish area)

Parking is at the high school and may be limited as it was in 2013. Please carpool as much as possible. There is neighborhood parking and a shopping center 1.4M away (Montgomery Village Center) where you could meet up and combine vehicles. Thanks for considering carpooling.

When 6AM Start

The Stone Mill 50 Mile run will start at 6:00 AM on Saturday November 15,2014. The cut off time is officially 13 hours or 7:00 PM,and will be strictly enforced due to permit requirements and so we can let our amazing volunteers go home. Intermediate cutoffs are

6PM to Rt 355 Aid Station,3 miles to go

4:45PM to the Riffleford Rd Aid Station,8 miles to go

2:45PM to the Rt 28 Aid Station,16 miles to go

1:30PM to the Stone Mill,22 miles to go

Where Start/Finish Watkins Mill High School

This year we will again have the start/finish at Watkins Mill High School 10301 Apple Ridge Road Gaithersburg,MD  20879

Packet Pickup
Beat the morning rush.  There will be a packet pickup on Friday Nov 14th. Location to be announced.

You can still pickup your packet on race day at the starting area if you can’t make it on Friday,but get there as early as possible (4:45-5AM).

Refunds and Bib Exchanges: It’s just not practical to process refunds or bib exchanges. If you decide to withdraw from the race please email Barry &Daryl and your entry fee will be donated to the State and County parks instead of buying more stuff for the aid stations.

Pacers: Sorry,no pacers.  Our permits with the various park services have a strict limit on the number of runners so we can’t allow  pacers.