From big races to Saturday morning group runs—find half marathon events and connect with the local endurance sports community.
Sun, Jul 26, 2026 at 7:30 AM
ARE YOU READY TO RUMBLE?
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.
This race is part of our free, low-key race series for members. Please refer to the "Low-Key Race Entry Procedure" on our website for more information.
13.1 Miles Half Marathon Run
Montgomery County, Maryland, 20841, United States