Partly — dogs are allowed in some of it
Dog-friendly island, but you cannot get your dog there on the ferry. Leashed dogs are welcome on the park roads and trails of Cumberland Island's southern end for DAY VISITS only — the National Park Service bars pets from the designated wilderness covering most of the north half, and from every campground, so no overnight trips with a dog. The catch is access: "The ferry does not transport pets", and the NPS states "The only way to get to the island is by passenger ferry (not a car ferry) or private boat." In practice that means bringing a dog requires your own boat or a private charter; the Greyfield Inn's private ferry does not take pets either. Do not drive to St Marys with your dog assuming you can buy a ferry ticket — you will be turned away at the dock. ADA service animals are the exception and may travel everywhere, including on the ferry and in campgrounds. Verified against nps.gov, 17 Aug 2026.
Where dogs ARE allowed
Leashed pets ARE allowed on park roads and trails on the SOUTHERN end of the island, day-use only — so the claim is right that the island itself is partly dog-friendly. Barred from the designated wilderness covering most of the north half, and from all campgrounds (no overnight stays with a dog). The practical catch is transport, not the land: the NPS concession passenger ferry from St Marys will not carry a pet, so the only way to bring a dog is your own boat or a private charter. The Greyfield Inn's private ferry from Fernandina Beach does not carry pets either. ADA service animals ride the ferry and may go everywhere, including campgrounds.
Managed by National Park Service, Cumberland Island National Seashore. Official pet policy. Checked against that page in August 2026.
We publish this because finding out at the trailhead is worse than finding out here. Rules change — check before a long drive.