At the entrance to St Peter Port harbour, Castle Cornet is a former tidal-island fortress connected to the shore by a causeway. Built in the 13th century, it now holds five museums covering the castle, Guernsey’s military history and maritime past, along with four historic gardens. Walk the battlements for views across the harbour and towards neighbouring islands, or join the guided tour, which is included in admission. Allow time for the exhibits and gardens, and check when the midday gun will fire before planning your visit.
A fortress at the harbour entrance
Castle Cornet stands on the southern arm of St Peter Port harbour, joined to the mainland by a causeway. It was built on a tidal islet in the 13th century and has guarded the harbour for around 800 years. Its position gave it a view over the approaches to St Peter Port and the sheltered anchorage below.
The castle was once the official residence of Guernsey’s governor. In 1672, a lightning strike caused an explosion that destroyed it. Today, its fortifications, museums and gardens make the site a place to explore both the castle’s history and the island’s past.
Five museums inside the walls
The museums cover different parts of Guernsey’s history. The Story of Castle Cornet follows the fortress itself, while the Maritime Museum focuses on the island’s connections with the sea. The 201 Squadron (RAF) Museum, Royal Guernsey Light Infantry Museum and Royal Guernsey Militia Museum cover military history.
Exhibits include the castle’s role during the Second World War and the history of its defences. The grounds also contain four historic gardens. Explore at your own pace or take the guided tour, which begins at 10:30 am and is included in the admission price.
The battlements and midday gun
Walk around the battlements for views back towards St Peter Port and across the water to the surrounding islands, including Herm and Sark. The castle’s position at the harbour mouth makes the ramparts a useful place to take in the layout of the town and its waterfront.
The midday gun is fired at set times, with gunners in period military dress. Firing schedules can vary, so check the timing before you visit if you want to see it. Historical performances also take place at the castle, including re-enactments on some summer days.
Planning your visit
The castle is a short walk from central St Peter Port, along the harbour and causeway. Visitors can take the guided tour or explore the museums, gardens and defences independently. Plan on two to three hours if you want time for several exhibits and the grounds; a longer visit leaves room to see more of the collections.
The site has a café and toilets, and free parking is available nearby. Castle Cornet is not wheelchair accessible, and its steps and uneven paths call for comfortable footwear. An early start can make walking around more comfortable during hot summer weather.
FAQ
How long should you spend at Castle Cornet?
Allow around two to three hours for a tour or time to explore the museums and gardens.
Is the guided tour included in admission?
Yes. The guided tour is included in the admission price and starts at 10:30 am.
When does the midday gun fire?
The gun fires at set times. Check the schedule before your visit, as timings can vary.
Is Castle Cornet wheelchair accessible?
No. The site is not wheelchair accessible, and visitors will encounter steps and uneven paths.
