Key West is packed with sights, but one of the most unforgettable experiences sits 70 miles offshore. Fort Jefferson, a massive 19th-century fortress rising straight out of the turquoise Gulf, is one of the best day trips you can take from Key West. While Dry Tortugas National Park draws crowds for its snorkeling and diving, the fort itself is also a real showstopper, and it deserves a spot on your Key West itinerary.
Getting to Fort Jefferson
Because Fort Jefferson sits on remote Garden Key, you can only reach it by boat or seaplane. The Yankee Freedom ferry is the most popular option, with a roughly two-and-a-half-hour ride each way and plenty of time to explore once you land. If you would rather trade the sea legs for a bird’s-eye view, a seaplane adventure makes the trip in about 40 minutes and serves up sweeping views of reefs, shipwrecks, and crystal water below. Both options fill up months ahead, so reserve early.
The History of Fort Jefferson & Tours
Construction on Fort Jefferson began in 1846 and continued for more than 30 years, though it was never fully finished. Built with roughly 16 million bricks, it remains one of the largest masonry structures in the Western Hemisphere. Walking the parade grounds and climbing to the upper level, you can take in the sheer scale of the place along with panoramic ocean views from the ramparts.
The fort also carries a fascinating past. During the Civil War, it served as a military prison, and its most famous inmate was Dr. Samuel Mudd, the physician convicted of treating John Wilkes Booth after the assassination of President Lincoln. Interpretive exhibits and ranger talks bring these stories to life, giving history lovers plenty to discover.
Dry Tortugas Beyond the Fort: Snorkeling & Diving
The waters that surround Fort Jefferson are a big part of the appeal of a day trip from Key West to Dry Tortugas National Park. The shallow reefs around Garden Key deliver some of the clearest snorkeling and diving in the country, with vivid coral, tropical fish and even a historic shipwreck to explore. Pack a swimsuit and take advantage of the swim areas near the moat wall after exploring Fort Jefferson. It is the perfect way to cool off between history lessons.
Comfortable & Convenient Key West Vacation Rentals
A day trip to Fort Jefferson makes for a long and rewarding adventure, so you will want a comfortable home base waiting when you return. At Compass Realty, we offer vacation rentals across Key West, including convenient locations that put you within walking distance of the best shops, restaurants, and attractions. Whether you picture a cozy condo or a roomy home for the whole family, our complete collection of lodging options in Key West has something for everyone.
