Welcome to the Seneca Creek Greenway Trail Marathon & 50K, where you will experience some of Montgomery County's finest single-track trails. This is a challenging, but beautiful run for all!
The Seneca Creek Greenway Trail Marathon and 50K is a low-key, low-priced, and fun-filled event along the beautiful Seneca Creek Greenway Trail and parallel trails. Marathon and 50K participants will have the option to choose their final distance during the race (either stop at the finish line for the "marathon" or keep going to complete the 50K).
All participants will receive a custom race bib, short-sleeved tech shirt, and a finisher's medal!
Mar 07, 2026
Distance — 50K
Type — Running
07:30
$68.00
Mar 07, 2026
Distance — 26.2 Miles
Type — Running
07:30
$68.00
These values represent the 3-year monthly averages for March in Gaithersburg.
Learn more about the host city, Gaithersburg.
Gaithersburg is a city of 70,000 people (2020) in Montgomery County, Maryland. It is a suburb of Washington, D.C.
Read more launchWatch highlights and course previews from previous years.
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