Seneca Creek Greenway Trail Marathon and 50K

Embark on an exhilarating trail adventure at the Seneca Creek Greenway Trail Marathon and 50K, set for March 7, 2026, in the picturesque Seneca Creek State Park in Gaithersburg, MD. This low-key, fun-filled event invites runners to traverse some of Montgomery County's most stunning single-track trails, offering a challenging yet incredibly rewarding experience for trail enthusiasts. Typical race day conditions in early March often present highs around 49F and lows around 32F, with a 12% chance of precipitation, meaning runners should be prepared for potentially chilly and damp conditions.

The course itself is a true test of grit and spirit, winding along the beautiful Seneca Creek. Runners will navigate a dynamic landscape characterized by rolling hills and dense wooded areas, encountering muddy, rocky, and root-laden terrain, along with steep sections and creek crossings. The marathon distance, actually closer to 28 miles, and the 50K both feature significant elevation changes, with the 50K boasting an elevation gain of approximately 2200 feet, classified as a moderate to hilly race. What makes this race truly unique is the ability for participants to decide their final distance at a crucial decision point around 27.7 miles, choosing whether to complete the marathon or push on for the full 50K.

Aid stations, strategically placed every 5 to 8 miles, are known for being well-organized and generously supplied with water, Gatorade, and an array of snacks, all supported by dedicated volunteers. A convenient drop bag service is also available, transporting bags to the Berryville Road Aid Station. Starting and finishing at the Nuthatch Pavilion within Seneca Creek State Park, this event, which first debuted in 2004, promises a memorable journey through nature, testing both endurance and trail-running skills.