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Welcome to Grassy Flats

If you're looking for sunny, adventure-filled days, and warm, breezy evenings sipping cocktails oceanside, you've found your perfect vacation spot in the Florida Keys.

Unplug and unwind at Grassy Flats, a family-owned, eco-friendly boutique resort located on Grassy Key. We are focused on sustainable hospitality, action water sports, and providing personalized services and unforgettable stays. 

With a blend of modern amenities and historical charm, Grassy Flats offers a unique "olde Florida" experience.

Kiteboarding lessons in the Florida Keys.

World Class Watersports

Kiteboarding. Paddleboarding. eFoiling. Sailing. We've got something for everyone to get out on the water, and after a day of adventure you can feel good about indulging in a cocktail or two.

Oceanfront balcony view overlooking the ocean and a swimming pool at a hotel in Marathon, Florida.

Oceanfront Pools

One pool for the whole family, one pool and hot tub just for the adults. Whether your poolside vibe is socializing or solitude, the choice is all yours.

Bunch of bananas hanging in a botanical organic garden in the Florida Keys.

Sustainable Practices

We're dedicated to operating with the environment in mind so our slice of paradise is here for generations to come.

Rose petals on the bed for a luxury hotel in Marathon, Florida.

In-Room Packages

Whether you're looking to add a touch of indulgence or celebrate a special occasion, we have a variety of options to choose from. With our in-room packages, you'll be greeted with the luxury you deserve from the moment you arrive.

Sunny beach view with a lounge chair and umbrella at Grassy Flats hotel in Marathon, Florida.

Beach Club

Get the best of Grassy Flats with an annual Beach Club Membership. With resort and cabana access, free events, discounts on food and beverage, and more, it's the perfect way for locals and frequent visitors to enjoy everything Grassy Flats has to offer.

Full Moon Party at Grassy Flats hotel the Florida Keys.

Events

Stay in the loop with the latest events, from unforgettable full moon parties to elegant wine pairing dinners. Follow us to make sure you don't miss out any of the fun!

Thank you for voting!

Best of Marathon - Best Resort/Hotel 2024
"The feel was more like being the guest of a close friend than that of one staying in a hotel."

David G.

"One of the best vacation experiences I’ve ever had! Accommodations were beyond expectation. Staff is easygoing & attentive. Several excellent dining options on premises. The view from the rooms is spectacular."

RJL

"We had a great stay. Relaxing atmosphere with accessibility to kayaking, paddle boarding, kiteboarding, and sailing."

Scott H.

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