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Parks & Beaches · Marathon

Sunset Bay Park on Grassy Key

City of Marathon neighborhood / nature park on Grassy Key’s gulfside at Morton Street and Kyle Avenue (~MM 58). Official materials describe three lots with an upland hammock of native vegetation (including gumbo limbo, poisonwood, sea grape, mahogany and mangroves) that provide habitat for songbirds and other wildlife, and note it as a great spot to watch sunsets.

Visit official website ↗Open map ↗

Plan your stop

Useful details

Before you go

Confirm current access and any dock or amenity status on https://www.ci.marathon.fl.us/parksrec/page/sunset-bay-park-grassy-key (City parks list: https://www.ci.marathon.fl.us/parksites). The phone number is the City Parks & Recreation contact from the official park page.

On Marathon, at MM 47–60

Sunset Bay Park on Grassy Key sits in Marathon (Middle Keys, MM 47–60). The service hub of the Middle Keys, with an airport, hospital, marinas, boat ramps and plenty of dining. This listing is for public outdoor time, with parking, heat and wildlife rules checked first.

Other parks & beaches listings currently published on Marathon include Children's Rotary Park, Coco Plum Beach, Jesse Hobbs Park. Compare them on the island or category hub rather than assuming this listing is the only option.

What this record includes

Directory category
Parks & Beaches
Island area
Marathon (Middle Keys, MM 47–60)
Mapped as
parks & beaches
Published address
Morton Street & Kyle Avenue, Marathon, FL 33050
Published phone
305-743-6598
Official website on file
Yes — confirm details there
Mapped or source amenities
Upland hammock / native vegetation, Birding and nature viewing, Sunset viewing
Source
City of Marathon Parks & Recreation — Sunset Bay Park on Grassy Key

Confirm before you go

  • Current hours, closures, fees and access rules on the linked source
  • Today’s hours — none are published on this listing
  • No ratings or “best of” rank — this page does not score or rank places

How to use this listing

Sunset Bay Park on Grassy Key is a park listing in Marathon (Middle Keys, MM 47–60). Facilities and access depend on the managing agency.

Confirm current conditions on the managing agency page before you go. Carry water; heat is part of the plan, not a surprise.

Listed amenities & features

  • Upland hammock / native vegetation
  • Birding and nature viewing
  • Sunset viewing
Use this listing withMarathon island directoryParks & Beaches across the KeysAdd this stop to a trip list
Source & accuracy

This listing was reviewed using City of Marathon Parks & Recreation — Sunset Bay Park on Grassy Key. The official website is the right place for menus, rates, reservations and hours. Directory text is a planning aid, not a live operations feed. Last reviewed on Oct 6, 2026 using City of Marathon Parks & Recreation — Sunset Bay Park on Grassy Key.

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