A massive island fort and brilliant reefs, 70 miles out from Key West.
Photo: Richard Gangemi · CC BY-SA 4.0 · via Wikimedia Commons
Dry Tortugas is the hardest national park in the lower 48 to reach, and that's exactly the point. Seventy miles west of Key West, across open Gulf water, sits a scatter of seven tiny islands almost entirely surrounded by sea — and on one of them, Garden Key, stands Fort Jefferson, one of the largest brick structures in the Americas, a hexagonal 19th-century coastal fortress that never saw battle. Around it lie some of the clearest water and best snorkeling in the Florida Keys.
You can't drive here. There are no roads, no shops, no fresh water, no cell service — you arrive by ferry, by seaplane, or by private boat, and you bring everything you need. Most people come for the day: explore the fort and its moat, snorkel the moat wall and the shallow coral right off the beach, and watch frigatebirds wheel over the Bush Key bird rookery. The truly committed camp overnight on Garden Key for the sunsets and a sky full of stars with no light for 70 miles.
The access is the trip, so plan it carefully. The official Yankee Freedom ferry from Key West takes about 2.5 hours each way and includes meals, snorkel gear, the entrance fee, and a fort tour — and it sells out weeks ahead. The seaplane is faster (about 40 minutes) with a stunning low approach over the reefs. Go in the calm, dry winter-to-spring season; summer and fall bring heat, rain, and hurricane-season risk, when crossings turn rough and trips get canceled.
One of the largest 19th-century masonry forts in the Americas — a vast six-sided brick fortress filling tiny Garden Key, with a huge open parade ground and a water-filled moat you can walk around.
Insider tipTake the included ranger tour first for the history, then walk the moat wall on your own — it doubles as the park's signature easy snorkeling edge.
Plan a trip to this spot →The seawall around the moat and the shallow coral just offshore are the most accessible snorkeling — brain and star corals, parrotfish, and reef fish in calm, swim-from-shore water.
Insider tipFerry trips include snorkel gear, and the best easy snorkeling is right beside the dock — no boat of your own needed.
Plan a trip to this spot →Small sandy beaches flank the fort with calm, clear, warm water — easy swimming and wading between snorkel sessions.
Insider tipThere's almost no shade and no services — bring sun protection, water, and everything else for your hours ashore.
Plan a trip to this spot →The only major U.S. nesting colony of sooty terns — tens of thousands of birds — plus brown noddies and magnificent frigatebirds.
Insider tipThe island closes seasonally for nesting (roughly late winter into fall); when it's closed, watch the spectacle with binoculars from the fort. Spring is peak birding.
Plan a trip to this spot →The park's largest island, crowned by an 1858 lighthouse and ringed by excellent reef — a photogenic, far-flung landmark.
Insider tipReachable by private boat only (not on the day ferry or seaplane) — plan it only with your own boat and good seas.
Plan a trip to this spot →An iron-hulled sailing ship that sank in 1907 on Loggerhead Reef, now resting in about 20 feet of clear water — one of the Keys' best wreck snorkels, with a marked underwater trail.
Insider tipIt's off Loggerhead Key (private-boat access), and shallow enough to snorkel, not just dive.
Plan a trip to this spot →Tropical maritime — warm and breezy year-round, with highs from the mid-70s in winter to around 90°F in summer and lows rarely below the low 60s. Winter through spring is the drier, calmer-seas season and the prime time to visit; summer and fall are hotter, much wetter, and stormier, peaking August–October. Atlantic hurricane season runs June through November, when seas turn rough and ferry and seaplane trips are most likely to be canceled.
Drive the Overseas Highway to Key West — then a boat or seaplane does the last 70 miles. There are no roads, no cars, and no services on the island; whatever you need, you bring.
Your staging town: stay here the night before, since the ferry and seaplane both leave early. The drive down from the mainland over 42 bridges is one of the great American road trips on its own.
Leave the carPark in Key West near the ferry terminal (or your hotel) — the car stays on the mainland; nothing drives on Garden Key.
Book aheadBoth the ferry and the seaplane sell out weeks ahead in season — reserve before you lock your dates, not after.
Not boarding the boat?Even if you skip the crossing, Key West itself rewards the drive — Fort Zachary Taylor, the southernmost point, and the harbor are all worth a day.
No cars — the access logistics are the trip. All options leave from Key West and cross ~70 miles of open Gulf; there are no services on the island, so bring everything.
The official park ferry from Key West — about 2.5 hours each way, with roughly 4.5 hours on the island. The fare includes breakfast and lunch, snorkel gear, a ranger fort tour, and the entrance fee. Reserve well ahead; it sells out weeks out.
The seaplane (about 40 minutes each way, with a gorgeous low approach over the reefs) offers half- and full-day trips. Private boats can reach the outer keys the day-trippers can't — but demand serious open-water planning.
No lodging — day-trip from Key West, or camp primitively on Garden Key.
What nearly everyone does — base in Key West and take the ferry or seaplane out and back in a day.
Booking tipThe simplest plan; book the ferry or seaplane far ahead.
A small primitive campground beside Fort Jefferson — a handful of sites, composting toilets, picnic tables and grills, and nothing else. Most campers ride out on the ferry, which carries only about ten camping passengers a day.
Booking tipReserve the camping ferry slot far ahead, and bring ALL your water (about 2 gallons/person/day), food, and fuel — there's no fresh water, power, or cell service.
The jumping-off city, with the full range of hotels and dining, and the departure point for both the ferry and seaplane.
Booking tipThe practical base for any Dry Tortugas trip.
What does it cost to enter?
The park entrance fee is $15 per person, good for 7 days (free under 16). It's usually included in the Yankee Freedom ferry ticket and added on for seaplane and private-boat visitors; America the Beautiful and other park passes are accepted.
How do I get there, and how far ahead do I book?
There are no cars — choose the Yankee Freedom ferry (about 2.5 hours each way, with meals, gear, and a fort tour included) or the seaplane (about 40 minutes each way, half- or full-day). Book well ahead: the ferry routinely sells out weeks in advance, especially in peak winter-spring season.
Day trip or camping?
A day trip works for nearly everyone — the ferry gives about 4.5 hours ashore, plenty for the fort and snorkeling. Camping on Garden Key is for those who want sunset, stars, and solitude, but ferry camper slots are very limited and you must pack in everything.
Can I snorkel, and do I need my own gear?
Yes — the moat wall and the reefs right off Garden Key are excellent, calm, swim-from-shore snorkeling. The ferry includes gear; seaplane and private-boat visitors should bring their own. The wreck and outer reefs require a private boat.
Are there services or fresh water on the island?
No — there's no food or drink for sale, no fresh water, no fuel, no shops, and no cell service. Pack everything you'll need, including plenty of water, and carry out all your trash.
When should I go?
Winter through spring (about December–April) for the calmest seas and driest weather — and spring for peak birding. Avoid the heart of hurricane season (June–November), when seas roughen and crossings get canceled.
Pick your vehicle, line up the stops on the way in and out, and carry the whole route in your pocket.
