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Overview
Dry Tortugas National Park occupies a cluster of seven small islands — and the surrounding waters — roughly 70 miles west of Key West in the Gulf of Mexico. Accessible only by ferry or seaplane, the park is one of the most remote and least-visited units in the National Park System, which helps preserve its extraordinary clarity of water and largely undisturbed reef ecosystems.
The centrepiece of the park is Fort Jefferson, a massive 19th-century coastal fortification that was never fully completed and served primarily as a military prison during and after the Civil War. Its sheer scale — it is one of the largest brick structures in the Western Hemisphere — surprises nearly every first-time visitor arriving across open water.
Beyond the fort, the park is prized for some of the most accessible coral reef snorkeling in North America, rich bird life including large colonies of sooty terns and frigatebirds, and sea turtle nesting habitat. Because no roads lead here, the visitor experience is inherently deliberate and unhurried.
Before You Go
Advance planning is essential. There is no fresh water, no food vendor, and no cell service in the park. Day-trippers should bring everything they need for the day; campers must bring all supplies for their entire stay.
Entry and Fees
The park charges an entrance fee. Fee amounts and pass acceptance (including the America the Beautiful pass) should be verified on the official National Park Service website at nps.gov/drto before your trip, as rates are subject to change.
Camping Permits
The campsite on Garden Key operates on a first-come, first-served basis, though ferry operators and the park service can advise on availability. Campsites have no electricity, no running water, and no shower facilities. Bringing more water than you think you need is strongly advised.
Health Considerations
The subtropical sun and reflected light off the water intensify UV exposure significantly. High-SPF reef-safe sunscreen, wide-brimmed hats, and UV-protective clothing are strongly recommended. Visitors prone to seasickness should take appropriate precautions before the 2.5-hour ferry crossing.
Getting There
There are two ways to reach the park, both departing from Key West.
Ferry
A high-speed catamaran ferry operates daily service between Key West and Garden Key. The crossing takes approximately 2 to 2.5 hours each way. The ferry is the most common option for day-trippers and campers. Verify current schedules and booking procedures directly with the ferry operator, as departure times and availability change seasonally.
Seaplane
A seaplane service offers a dramatically faster crossing and an aerial view of the reef system below. It is considerably more expensive than the ferry and typically carries small groups. Seaplane visitors generally spend a half-day at the park before returning. Check availability and current pricing with operators based in Key West.
Private Boat
Visitors with offshore-capable private vessels may anchor in designated areas. The park service publishes anchoring guidelines and no-anchor zones to protect reef habitat; consult nps.gov/drto for current regulations before arriving by private boat.
Getting Around
Garden Key, where Fort Jefferson stands, is small enough to walk entirely in under an hour. The campsite, fort entrance, and beach areas are all within easy walking distance of the ferry dock.
Getting between islands requires a kayak, private dinghy, or similar small watercraft. Some ferry operators offer kayak rentals or guided paddle tours as add-ons; verify what is currently available when booking. Bush Key, adjacent to Garden Key, is seasonally closed to protect nesting bird colonies — check current closure status before attempting to visit.
There are no motorized vehicles in the park. Snorkeling around the fort moat and along the nearby reef requires only fins, a mask, and a snorkel, all of which some ferry operators offer as rentals.
Things to See & Do
Fort Jefferson
Exploring the six-sided fort is the primary land-based activity. Self-guided tours let visitors walk the perimeter, climb to the ramparts for panoramic Gulf views, and learn about the fort's construction history and its most famous prisoner, Dr. Samuel Mudd. Ranger-led programs run on certain days and are worth timing your visit around — check the current schedule with the park.
Snorkeling and Diving
The waters immediately surrounding Fort Jefferson and the nearby coral formations offer exceptional visibility and reef fish diversity. The moat wall of the fort itself is encrusted with coral and frequented by parrotfish, angelfish, and occasional sea turtles. More advanced snorkelers can venture to Little Africa, a reef formation a short swim from shore known for its coral density.
Birdwatching
The Dry Tortugas sit along a major Atlantic migratory flyway, making spring migration (roughly March through May) a magnet for serious birders. Bush Key hosts one of the largest sooty tern nesting colonies in North America. Magnificent frigatebirds are visible year-round, often circling the fort.
Stargazing
With zero light pollution, the park offers exceptional night skies. Campers frequently cite the stargazing as one of the most memorable experiences in the park.
Food & Drink
There are no restaurants, cafes, or food concessions inside Dry Tortugas National Park. Day-trippers should bring a packed lunch and snacks; the ferry operator typically sells limited food and beverages on board, but this should not be relied upon as a primary meal source.
Campers must bring all food for their stay. A cooler with ice is the standard approach. Open fires are generally not permitted — confirm current campfire regulations with the park before arrival. A small camp stove is a practical option for multi-day visitors.
Drinkable water is not available anywhere in the park. Bring significantly more water than you expect to consume, accounting for heat, sun, and physical activity.
Practical Information
Communications
There is no cell service and no Wi-Fi in the park. The ferry and seaplane operators and park rangers are your primary resources once you arrive. Inform someone on the mainland of your itinerary before departing.
What to Pack
- Reef-safe sunscreen and sun protection (hat, UV shirt)
- More drinking water than you think you need
- All food for your stay
- Snorkel gear (or plan to rent from the ferry operator)
- Insect repellent — mosquitoes and sand flies can be severe, particularly at dusk in warmer months
- Waterproof bag for electronics and valuables
- Cash or card for park entrance; verify accepted payment methods in advance
Medical and Emergency Services
There are no medical facilities in the park. The nearest hospital services are in Key West. Rangers have basic first aid capabilities. In a genuine emergency, evacuation by boat or seaplane would be required. Verify the park's current emergency contact protocol with the ferry operator or at nps.gov/drto.
Safety
Ocean currents around the Dry Tortugas can be strong and unpredictable. Snorkelers and kayakers should assess conditions carefully and stay within their ability level. Non-swimmers or weak swimmers should remain in the calmer, shallower waters near the fort rather than venturing to open reef areas.
The subtropical sun is intense year-round. Heat exhaustion is a genuine risk, particularly for visitors who underestimate the effect of full sun on open water. Stay hydrated, seek shade during peak afternoon hours, and monitor children carefully.
Marine life in the park is federally protected. Do not touch, stand on, or collect coral, shells, or any living organism. This is both an ecological matter and a legal one — violations carry significant penalties. Avoid touching or feeding fish, and be cautious around moray eels and sea urchins near reef structures.
