Available distances
About
MCRRC Riley's Rumble Half-Marathon is held on July 25, 2027, in Boyds, Maryland, with a shorter 8 km option alongside. The half marathon (13.1 mi) starts at 7:30 a.m. The race has a long-standing reputation as one of the hardest in the region, on relentless hills and in full summer heat and humidity.
A course with that reputation is not one to run against the clock: pick an effort you could sustain in conversation for the first five miles, and judge your race on how much of the field you pass after mile ten. Runners who treat a hot, hilly half as a normal half marathon end up walking the last three miles — the ones who plan for it finish comfortably.
Highlights
- City
Prepare for MCRRC Riley's Rumble Half-Marathon with RunRun
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Races nearby
Other upcoming races around Boyds.
MCRRC Black Hill 10K XC
Oct 17, 2026 · Boyds, MD · 0 mi away
6.2 mi
Mustang's Milestone 5K
Oct 24, 2026 · Clarksburg, MD · 5 mi away
3.1 mi
World Mental Health Day 5K - Gaithersburg, MD
Oct 10, 2026 · Gaithersburg, MD · 6 mi away
3.1 mi
Parks Half Marathon
Sep 27, 2026 · Rockville, MD · 11 mi away
13.1 mi
National Capital 10 Miler and Janet Braunstein 5 Miler
Oct 3, 2026 · Bethesda, MD · 12 mi away
20 mi · 5 mi
Ghost 5k & Scarecrow Sprint Fun Run
Oct 24, 2026 · Ashburn, VA · 14 mi away
3.1 mi