Dry Tortugas National Park

Dry Tortugas is a cluster of seven small islands and the bright, shallow sea around them, sitting near the tail end of the Florida Keys about 70 miles west of Key West. Most of the park is water. The islands themselves are low and sandy, made of coral and shell, and small enough that you can walk the shoreline of the main one in a short stroll. The name tells you two useful things. 'Dry' means there is no fresh water here at all, a warning to early sailors. 'Tortugas' is Spanish for turtles, for the sea turtles that have nested on these beaches for centuries.

The centerpiece is Fort Jefferson on Garden Key, an enormous 19th-century brick fortress and one of the largest masonry structures in the Americas. Its walls stand tall out of the water, ringed by a moat, built of many millions of bricks that were shipped in one boatload at a time. Because Dry Tortugas is so far out in the Gulf, so hard to reach, and so completely surrounded by ocean, a visit feels like stepping off the edge of the ordinary world. The fort rises straight from the sea, and the only sounds are wind, waves, and seabirds.

Beyond the fort, the real magic is underwater and overhead. Shallow coral reefs and old pilings sit just off the beach in water so clear you can watch fish, coral, and the odd sea turtle from the surface. In spring the islands become one of the best birding spots in the country, a first patch of land for tired migrants crossing the Gulf. Above it all stretch some of the darkest, most open skies you will find in Florida, far from any city glow.

• By ferry or seaplane from Key West is the only way in. There is no road, no bridge, and no car access to the Dry Tortugas. Everyone arrives across open water, either on the passenger ferry or by seaplane, and both leave from the Key West area.
• To reach the departure point, drive the Overseas Highway (US-1) all the way down the Florida Keys to Key West, roughly 160 miles south of Miami. From there the ferry or seaplane carries you the last 70 miles out to Garden Key. Because seats are limited and often sell out, book your crossing well ahead of your trip.

• Fort Jefferson on Garden Key is the heart of any visit. You can walk the ramparts, cross the moat, explore the brick archways and gun rooms, and take in long views of open sea from the top of the largest masonry fort in the Americas.
• Snorkeling right off the beach is the other main draw. Shallow coral reefs, sea grass, and the old pilings around the fort sit close to shore in clear, warm water full of tropical fish and the occasional sea turtle.
• Loggerhead Key, a separate island within the park, carries a tall historic lighthouse that you can spot from the ferry as it crosses. It marks one of the outer edges of the reefs.
• Key West, the departure city, is a historic town worth exploring before or after your trip, with its old streets, harbor, and long seafaring past.

Long before any fort or park, these islands were part of the wider seas that Indigenous peoples of Florida and the Caribbean knew and traveled. The Tortugas were a landmark and a source of sea turtles, fish, and birds for those who passed through. In 1513 the Spanish explorer Juan Ponce de Le'on charted the islands and named them Las Tortugas for the many turtles his crew found. Sailors later added 'Dry' to the charts to warn others that these islands held no fresh water, a hard fact for anyone hoping to resupply.

The islands sat at a crossroads of ship traffic between the Gulf and the Atlantic, and whoever controlled them could watch over the whole passage. Starting in 1846 the United States began building Fort Jefferson on Garden Key to guard that route. It grew into a six-sided brick giant, laid up brick by brick over decades by workers who included enslaved and hired laborers, though it was never fully finished and its heavy guns were made obsolete by newer weapons before it was done.

During and after the Civil War the fort served as a military prison. Its most famous prisoner was Dr. Samuel Mudd, the physician convicted of setting the broken leg of John Wilkes Booth after the assassination of President Abraham Lincoln. Mudd was held here for several years, and during a deadly outbreak of yellow fever he helped treat the sick, work that later played a part in his pardon. In time the fort was abandoned as a fortress and left to the sun, the storms, and the sea.

The wild islands and their turtles, birds, and reefs eventually became the reason to protect the place. Fort Jefferson was named a national monument in 1935, and in 1992 the area was enlarged and set aside as Dry Tortugas National Park. Today rangers protect the fort, the nesting sea turtles the islands were named for, and the great flocks of migrating birds that pause here each spring on their long flight across the Gulf.

• Fort Jefferson is one of the largest brick masonry structures in the Americas, built from many millions of bricks that all had to be carried in by ship across open ocean.
• The fort was never actually finished, and it never fired a shot in battle. Newer, more powerful guns made its design outdated before construction was complete.
• Dr. Samuel Mudd, imprisoned here for treating the leg of Lincoln's assassin, helped fight a yellow fever outbreak at the fort, work that contributed to his later pardon.
• 'Dry' in the park's name is a real warning: there is no natural fresh water anywhere in the park, so early sailors could not refill their water barrels here.
• The islands are named for the sea turtles Spanish sailors found in 1513, and loggerhead and green sea turtles still nest on the beaches today.
• Each spring the tiny islands become a magnet for migrating birds crossing the Gulf of Mexico, making Dry Tortugas one of the top birding spots in the United States.
• Almost the entire park is water rather than land. Only a small fraction of it is dry ground, and the rest is open sea, coral reef, and shallows.
• The park is so far from city lights that it has some of the darkest night skies in Florida, wonderful for stargazing on a clear night.

• An entrance fee applies, charged per person. Check the park website for current rates, and note that reaching the park usually also means paying for a ferry seat or a seaplane flight.
• Getting there is a commitment. The passenger ferry from Key West makes a crossing of roughly two and a half hours each way, and the seaplane takes about half an hour. Both require reservations, both often sell out, so book well ahead of your trip.
• Plan on a full day. Between the travel time out, a few hours to explore the fort and snorkel, and the trip back, a day trip fills the whole day. Give yourself extra time if you can.
• Bring everything you need with you. There are no stores, no restaurants, and no gas or water for sale on the islands, so pack your own food, drinking water, sunscreen, and any snorkel gear you want.
• Camping is primitive and only on Garden Key. You must carry in all your own supplies, including fresh water, and pack out every bit of your trash. Sites are limited and there are no hookups or services.
• The weather is hot and the sun is intense out on the open water. Bring shade, plenty of water, and sun protection, and take the sea and the reefs seriously, since help is far away and conditions can change quickly.
• For the best experience, aim for March through May, when bird migration peaks, or the winter months of December through March, when the water tends to be clearest and calmest.

There is no road to Dry Tortugas. The only way to reach it is by boat or seaplane from Key West, 70 miles away across open water. Most visitors take the passenger ferry, a crossing of about two and a half hours each way, while a seaplane makes the trip in roughly half an hour. Both the ferry and the seaplane require reservations, and seats often sell out, so it is best to book well before your trip.

The main attraction is Fort Jefferson, a huge 19th-century brick fortress on Garden Key that is one of the largest masonry structures in the Americas. You can walk its walls and archways and take in wide ocean views. The other big draws are snorkeling on the shallow coral reefs just off the beach and, in spring, some of the best birding in the country as migrating birds pause on the islands.

Yes, Dry Tortugas charges an entrance fee, usually per person, and interagency annual passes are accepted. Check the National Park Service website for the current rate. Keep in mind that reaching the park almost always means also paying for a ferry seat or seaplane flight from Key West.

Plan on a full day. Once you add the travel time out and back to the few hours you get on Garden Key to explore the fort and snorkel, a day trip takes up the whole day. Camping overnight lets you slow down and enjoy the islands after the day boats leave, but it takes much more planning and self-sufficiency.

Yes, and the snorkeling is a highlight. Shallow coral reefs, sea grass, and the old pilings around Fort Jefferson sit close to shore in clear, warm water, so you can snorkel right off the beach on Garden Key. You will often see colorful fish, coral, and sometimes a sea turtle. Bring your own gear, watch the currents, and always snorkel within your comfort and ability.

Yes, there is primitive camping on Garden Key, near Fort Jefferson. Sites are limited and there are no services of any kind, no hookups, no store, and no fresh water. You must bring everything you need, including all your drinking water, and you must pack out every bit of your trash when you leave. Camping trips take careful planning, since supplies and help are far away.

No. There are no stores, restaurants, gas, or drinking water for sale anywhere in the park. The word 'Dry' in the name refers to the lack of fresh water. Ferry day trips typically include a meal, but campers and independent visitors must carry in all their own food, water, and supplies.

Two windows stand out. March through May is peak bird migration, when the islands fill with birds resting on their flight across the Gulf. December through March usually brings the clearest, calmest water, which is ideal for snorkeling. Summer is hot and can be stormy, so bring shade and sun protection whenever you go.

Dry Tortugas is remote, hot, and surrounded by open ocean, so come prepared. Bring plenty of drinking water, sunscreen, and shade, since the sun over the water is intense and there is little natural cover. Take the sea seriously, mind the currents when snorkeling, stay within your ability, and remember that help is far away. Follow all ranger guidance and posted rules while you are there.

The name comes from two things. Spanish sailors named the islands Las Tortugas, meaning 'the turtles,' in 1513 for the many sea turtles they found nesting on the beaches. Later sailors added 'Dry' to their charts to warn others that the islands held no fresh water. Together the words became Dry Tortugas, and sea turtles still nest here today.