Dry Tortugas by private charter: Fort Jefferson without the crowd
Seventy miles west of Key West, past the last marker most boats ever see, the Gulf opens up and Fort Jefferson rises straight out of the water — a six-sided brick fortress on a speck of sand, ringed by some of the clearest, most untouched water in the country. This is Dry Tortugas National Park, and it's one of the few genuinely remote places left in the Florida Keys. Most people get there packed onto the ferry. There's a better way to do it.
- Distance: ~70 miles west of Key West
- Day trip: Fast offshore powerboat (Freeman / Axopar) — there and back
- Overnight: Sailing vessel — anchor at Garden Key
- Crossing: ~2 hours each way on the fast boats
- Group: Small-group, private
- Good to know: National Park fee applies; no food, water, or services on the island
What's actually out there
Dry Tortugas is a cluster of seven small islands and the reef around them. The centerpiece is Fort Jefferson on Garden Key — a 19th-century coastal fort and the largest brick masonry structure in the Americas, never finished, never fully armed, and slowly being reclaimed by the sea. You can walk the parade ground, climb to the upper tier for the view back across the moat, and stand inside walls eight feet thick that took sixteen million bricks to lay. (The National Park Service covers the fort's history if you want the full story before you go.)
But the real reason to make the run is the water. The snorkeling here is in a different class from anything closer to Key West:
- The moat wall drops off into clear water thick with snapper, parrotfish, tarpon, and the occasional nurse shark — easy entry, calm, and you're swimming over coral within minutes.
- The coral heads off Garden and Loggerhead Keys are healthy in a way most reachable reefs no longer are, simply because almost no one gets to them.
- Seasonally, Bush Key becomes a nesting ground for thousands of sooty terns and frigatebirds — a wall of noise and motion you can see from the boat.
There are no shops, no food, no fresh water out here. What you bring is what you have. That isolation is the whole point.
How far is it, and how do you get there?
Dry Tortugas sits about 70 miles due west of Key West — a real open-water crossing, not a harbor cruise. That distance is why the trip calls for the right boat, and why we run it with our excursion partners rather than our own Jeanneau.
The day trip — fast offshore. A there-and-back run on a purpose-built offshore powerboat like a Freeman or an Axopar. These boats cover seventy miles of open water in roughly two hours and ride soft doing it, so you spend the day on the island and the reef instead of white-knuckling the crossing. Small group, your schedule, off the dock before the ferry's even loaded.
The overnight — under sail. Run it on a sailing vessel and stay the night anchored off Garden Key. The ferry crowd clears out by mid-afternoon and the island is effectively yours — sunset over the fort, a quiet night at anchor, and the moat wall to yourself at first light before the next boat arrives. For a lot of people, this is the version they remember.
Why go private instead of the ferry
The ferry works, and for some people it's the right call. But it runs one schedule, lands a crowd at the same time, gives you a fixed window on the island, and turns around whether the snorkeling is good or not. Private flips that: your departure, your stops, your pace, and a handful of people instead of a few hundred. The crossing and the conditions get planned around the forecast, and you get a straight answer on whether the day's a go before you commit.
What to expect
Expect real distance and open water. Expect to be offshore, out of cell range, in water that turns from green to deep blue and back to glass over the flats. Expect a National Park fee, sun with nowhere to hide, and the kind of snorkeling that ruins you for the closer reefs. Bring more water than you think you need, sun protection, a hat, and a dry bag. The boat, the route, the safety gear, and the local read on where the fish are holding that week are handled.
Not ready for the full run?
The Tortugas is a commitment, and it isn't the right first trip for everyone. If you want clear water and good snorkeling without the seventy-mile haul, our snorkeling charter and sandbar trips hit the best reefs and flats closer to Key West aboard our own boat — same captain, half the day. Plenty of guests start there and come back for the Tortugas later.
Common questions
How far is Dry Tortugas from Key West?
About 70 miles due west across open water — the most remote spot in the Florida Keys.
Can you visit Dry Tortugas by private boat?
Yes. We run it with excursion partners: fast offshore powerboats for day trips, and sailing vessels for overnights. Our own Jeanneau handles the closer-water trips.
How long does the trip take?
A day trip is a full day — roughly two hours each way on a fast offshore boat, plus your time on the island and the reef. Overnights depart one day and return the next.
Is the snorkeling really better than closer to Key West?
Yes. The moat wall and the coral heads off Garden and Loggerhead Keys stay healthy because so few boats reach them. It's a step up from anything within easy reach of town.
Is there a fee, and what's on the island?
A National Park entrance fee applies. There's no food, water, or services out there, so you bring everything you need for the day.
When's the best time to go?
It's weather-dependent. Light-wind days make for a smoother crossing, so we watch the forecast and confirm the window before you commit.
When you're ready for the big one, reach out and we'll line up the right boat and start watching the weather with you.
Six Fins arranges private Dry Tortugas trips with vetted excursion partners and runs its own custom charters from the Perry Hotel & Hurricane Hole marinas in Key West.