Construction of Fort Jefferson was begun in 1846 but never completed. President Franklin Roosevelt declared it and the waters surrounding it a National Monument in 1935.
Flora and fauna
The Dry Tortugas exist in a subtropical climate. Temperatures range from the mid-50s to mid-80s. April and May are often idyllic. There are essentially two seasons: The winter season (December-March), which can be windy with rough seas, and the tropical storm season (June-November) during which Dry Tortugas experiences both hot, humid weather and calm seas or severe weather events. Due to the ever-changing weather patterns, an accurate weather forecast is recommended before your visit.
The park is open year round during daylight hours, and is only accessible by boat or seaplane.
A seven day pass is $5 for adults.
There are several passes for groups traveling together in a private vehicle or individuals on foot or on bike. These passes provide free entry at national parks and national wildlife refuges, and also cover standard amenity fees at national forests and grasslands, and at lands managed by the Bureau of Land Management and Bureau of Reclamation. These passes are valid at all national parks including Dry Tortugas National Park:
- The $80 Annual Pass (valid for twelve months from date of issue) can be purchased by anyone. Military personnel can obtain a free annual pass in person at a federal recreation site by showing a Common Access Card (CAC) or Military ID.
- U.S. citizens or permanent residents age 62 or over can obtain a Senior Pass (valid for the life of the holder) in person at a federal recreation site for $10, or through the mail for $20; applicants must provide documentation of citizenship and age. This pass also provides a fifty percent discount on some park amenities.
- U.S. citizens or permanent residents with permanent disabilities can obtain an Access Pass (valid for the life of the holder) in person at a federal recreation site at no charge, or through the mail for $10; applicants must provide documentation of citizenship and permanent disability. This pass also provides a fifty percent discount on some park amenities.
- Individuals who have volunteered 250 or more hours with federal agencies that participate in the Interagency Pass Program can receive a free Volunteer Pass.
- 4th graders can receive an Annual 4th Grade Pass that allows free entry for the duration of the 4th grade school year (September-August) to the bearer and any accompanying passengers in a private non-commercial vehicle. Registration at the Every Kid in a Park website is required.
In 2017 the National Park Service will offer ten days on which entry is free for all national parks: January 16 (Martin Luther King Jr. Day), February 20 (President's Day), April 15-16 & April 22-23 (National Park Week weekends), August 25 (National Park Service's birthday), September 30 (National Public Lands Day), and November 11-12 (Veterans Day weekend).
This is a cluster of 7 small islands. As such the only way to reach them (and travel between them) is by boat or seaplane.
The largest of the islands, Garden Key, hosts Fort Jefferson. Walking tours are provided and snorkeling is a must. All traffic is on foot.
- Fort Jefferson.
- Guided fishing trips.
- Guided wildlife viewing trips.
- Sailing charters.
and you can go diving there
- Gift Shop. A small National Park Service Gift Shop is available inside Fort Jefferson on Garden Key. It offers a very limited selection of items.
Limited camping is available. It is $3/person per night.