Welcome to the registration page for the MCRRC Riley’s Rumble Half-Marathon!
This page may also be used to sign up to volunteer – please see the “volunteer” tab to the left.
Riley’s Rumble Half Marathon
July 28, 2025
Boyds
Road
Ready to sign up?
100-500
Fast & Flat
Riverfront
High: 86°
/ Low: 67°
Filled with rolling hills along the rural countryside of Maryland’s upper Montgomery County, just across the river from Virginia, the Riley’s Rumble Half Marathon takes runners on an out-and-back course that starts and finishes along the historic Chesapeake and Ohio Canal Towpath, nestled along the Potomac River.
This popular warm-up event for the regional marathon events that take place later in the fall usually attracts 500 runners or more each year, so prospective entrants are encouraged to register well in advance of the race before it fills up.
From the starting line at the picnic area, where Seneca Creek meets up with the Potomac, runners follow a course that takes them east and south along the banks of the winding river, along a long, out-and-back route.
You’ll follow the route for the next 6 1/2 miles along the C&O Canal Towpath trail, all the way until you almost reach Riverbend Park and the Chesapeake and Ohio Canal National Historical Park, before making the turn and retracing your steps all the way back to the finish line at the picnic area where you started.
Overview
Welcome to the registration page for the MCRRC Riley’s Rumble Half-Marathon!
This page may also be used to sign up to volunteer – please see the “volunteer” tab to the left.
Course Description
Filled with rolling hills along the rural countryside of Maryland’s upper Montgomery County, just across the river from Virginia, the Riley’s Rumble Half Marathon takes runners on an out-and-back course that starts and finishes along the historic Chesapeake and Ohio Canal Towpath, nestled along the Potomac River.
This popular warm-up event for the regional marathon events that take place later in the fall usually attracts 500 runners or more each year, so prospective entrants are encouraged to register well in advance of the race before it fills up.
From the starting line at the picnic area, where Seneca Creek meets up with the Potomac, runners follow a course that takes them east and south along the banks of the winding river, along a long, out-and-back route.
You’ll follow the route for the next 6 1/2 miles along the C&O Canal Towpath trail, all the way until you almost reach Riverbend Park and the Chesapeake and Ohio Canal National Historical Park, before making the turn and retracing your steps all the way back to the finish line at the picnic area where you started.
