Last Updated: July 4, 2026
Grassy Key is one of approximately 1,700 islands that make up the Florida Keys. Located in the Middle Keys just northeast of Marathon, it sits at roughly mile marker 58 on the Overseas Highway — far enough from Key Largo to feel genuinely remote, close enough to Marathon to have access to restaurants, groceries, and activities. In the past we stayed at Big Pine Key, which is southwest of Marathon, but at the time we made our reservations, they were still rebuilding the RV park there from Hurricane Irma. Grassy Key turned out to be a wonderful alternative — a peaceful, waterfront retreat that we ended up staying at for two full weeks.
