Castle Porth Beach

Castle Porth - Tresco
© Cornwall Beaches
Last updated:

Castle Porth Beach is on the north of the island, overlooking Bryher to the west. Like most beaches on Scilly, it has white sand and clear waters, with a good crop of rocks and rock pools to explore.

Castle Porth is best known for being home to Cromwelll's Castle, a rare Interregnum fortress that's built right on the beach itself. Now managed by English Heritage, the fortress is open during daylight hours and is free to visit. Climb up to the roof for beautiful views across the channel to Bryher. Walk a bit further up the hill to see King Charles's Castle, an earlier fortress that's also in the care of English Heritage.

As well as exploring fortresses, this is a lovely place for a peaceful picnic. The shallow waters are calm and warm for a paddle, and your (leashed) dog can join you for a walk and a splash.

Type of beach


Lifeguard service

No lifeguard cover

Dogs friendly beach?

Dogs allowed but must be kept on lead

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OS grid ref.

SV 8828 1593