Yes, you can stay overnight in Dry Tortugas National Park, but the only option is primitive camping on Garden Key, right next to Fort Jefferson. There are no hotels, lodges, or water/electricity hookups. In 2026, you must bring everything with you—including all your fresh water, food, and fuel—and take all your trash back to the mainland. A supportive peer "logistics" warning: while the park doesn't take reservations for the 6-person individual campsites (they are first-come, first-served), the Yankee Freedom ferry that transports campers only has a limited number of "camper spots" available per day. These ferry spots often sell out 9 to 12 months in advance in 2026. If you miss the ferry reservation, your only other option is to arrive via private boat or seaplane (though seaplanes don't allow overnight stays with gear). It is a true "bucket list" experience with world-class stargazing and total seclusion.