Castle Cornet Guernsey 2026 — opening hours, museums, noon gun and tickets

Eight centuries of fortification at the heart of St Peter Port

Castle Cornet stands on a small rocky islet at the entrance to St Peter Port harbour, connected to the mainland by a causeway. It is the first thing you see arriving by sea and, for good reason, the first place most visitors head once they are ashore in Guernsey — one of the British Channel Islands.

The castle’s history spans more than 800 years of continuous fortification, from its construction in the early thirteenth century to its role as an active British military installation during the Second World War. It was besieged during the English Civil War, held for the royalist cause when most of Guernsey had switched allegiance to Parliament, and did not surrender until 1651 — years after the war on the mainland had ended. Today it is the most visited heritage site in Guernsey and houses five distinct museums within its walls. If you are planning a broader island visit, the Guernsey travel guide gives full context on how to combine Castle Cornet with other key sights.

The St Peter Port approach — a five-minute walk along the waterfront — gives you the best views of the castle before you enter. Arriving at 11:30 allows you to explore a couple of the museums before watching the noon-day gun ceremony at 12:00 sharp.

A brief history of Castle Cornet

Construction of a castle on the islet began around 1204, following King John’s loss of Normandy to the French crown. Guernsey and the other Channel Islands remained loyal to the English Crown — a loyalty that required serious coastal defence. The castle grew steadily through the medieval period, with a great keep, towers and a gatehouse added over successive reigns.

The most dramatic episode in the castle’s history came during the English Civil War (1642-1651). When most of Guernsey sided with Parliament, Castle Cornet remained a royalist stronghold under Governor Sir Peter Osborne. The castle was besieged by Parliamentary forces for eight and a half years — the longest siege in English history. Osborne’s garrison finally surrendered in December 1651.

In 1672, a catastrophic accident changed the castle’s silhouette permanently. Lightning struck the castle’s gunpowder magazine, which exploded with enough force to demolish the medieval keep and kill the wife and mother of the Governor, Lord Hatton. The explosion is still commemorated in the castle’s exhibits.

During the Napoleonic Wars and again in the Victorian period, further fortifications were added. The castle was used as a military barracks, prison and signals station. German forces occupied it from 1940 to 1945 and added their own modifications, some of which are still visible. The British military formally handed the castle over to the States of Guernsey in 1945, and it opened to the public the following year.

The five museums inside Castle Cornet

Castle Cornet is unusual in housing five separate but interconnected museums within its walls. Each occupies a different part of the fortification complex, and the natural flow of the site takes you through them sequentially.

The Story of Castle Cornet

The foundational exhibit, covering the castle’s 800-year history from its medieval construction through the Civil War siege, the 1672 explosion, the Napoleonic additions and the German occupation. Well-designed panels and artefacts give you the context to make sense of the architecture you are walking through.

The Maritime Museum

Guernsey’s maritime history is extensive — the island was a centre of privateering, shipbuilding and the Newfoundland cod trade for centuries. The Maritime Museum covers these industries through ship models, navigational instruments, maritime paintings and accounts of notable Guernsey seafarers. The display on the island’s privateer fleet is particularly engaging.

The Royal Guernsey Militia Museum

The Royal Guernsey Militia was one of the oldest continuous military units in the British Isles, with origins in the sixteenth century. This museum covers its history through uniforms, weapons, colours and personal effects. The militia served in both World Wars and was finally disbanded in 1940.

The 201 Squadron RAF Museum

201 Squadron RAF has its roots in the Royal Naval Air Service and is one of the oldest flying squadrons in the world. The museum covers its history through photographs, logbooks and personal accounts, with particular focus on its Sunderland flying boat operations in the Second World War and the role of Guernsey men in the RAF.

The Royal Guernsey Light Infantry Museum

The RGLI served as a line infantry regiment in the First World War, suffering heavy casualties on the Western Front. The museum commemorates their service with regimental records, personal effects and photographic archives. It is a moving exhibit that connects the island’s history to the wider tragedy of the war.

The noon-day gun: a daily ceremony not to miss

Every day from April to October, at precisely 12:00, a ceremonial cannon is fired from Castle Cornet’s ramparts. The tradition dates to 1857 and was originally used to allow ships in the harbour to set their chronometers by the time signal. Today it is purely ceremonial — and theatrical enough to be worth planning your visit around.

The firing is carried out in period uniform by Militia re-enactors. Position yourself on the upper ramparts or in the outer ward before noon for the best viewpoint. The sound carries across the whole harbour; if you happen to be having coffee at a waterfront café when it goes off at exactly 12:00, the regularity of it is genuinely impressive.

If you are visiting with children, the noon gun is often the highlight of the day. Young visitors are sometimes invited to assist with the ceremony — ask at the ticket desk when you arrive.

Opening hours and ticket prices (2026)

Castle Cornet is open daily from April to October, 10:00 to 17:00 (last entry 16:30). It is closed November to March. Check the official States of Guernsey website before visiting for any changes to seasonal hours.

Prices (approximate, 2026):

Adult: £11
Child (5-16): £7
Family (2 adults + up to 3 children): £29
Under 5s: free
Guernsey residents: free with proof of address

Annual passes for Guernsey’s historic monuments (covering Castle Cornet and other managed sites) represent excellent value if you are staying more than a few days. Ask at the ticket desk.

Note: The noon-day gun ceremony is included in the standard admission price. No separate ticket is required.

The castle gardens and ramparts

The castle’s gardens are one of its underrated pleasures. Sheltered by the castle walls, they are planted with species that reflect the island’s mild climate — including plants that would struggle in most of mainland Britain. In late spring and early summer, the gardens are at their best.

The ramparts offer 360-degree views: east across the Little Russel to Herm and Sark; north over the outer harbour; south along the Guernsey coast towards Fermain Bay. On a clear day, the coast of Normandy is faintly visible to the east. These are the best harbour views in the British Channel Islands without climbing a hill, and they are included in your admission.

How to get to Castle Cornet

Castle Cornet is a five-minute walk from the town centre along the Castle Pier from the harbour front. Follow the waterfront south from the main ferry terminal; the castle is directly ahead. There is no road access for private vehicles — the approach is on foot only.

From the bus station at the Picquet House, it is a 10-minute walk along the seafront. Taxis can drop you at the harbour end of the Castle Pier.

From Guernsey Airport, take bus route 91 to St Peter Port bus station (~25 minutes) then walk south along the seafront.

For a combined experience of the castle and the wider island, the Castle Cornet experiences on GetYourGuide list available guided options. Alternatively, the self-guided Guernsey audio tour covers both the castle and the wider town in one session.

Practical tips for visiting Castle Cornet

Allow at least 2-3 hours to see all five museums and the ramparts properly. A rushed one-hour visit will leave you feeling you missed half of it. For a full day in the capital, the St Peter Port guide includes a recommended itinerary that builds Castle Cornet into a wider town walk.

Arrive before 11:30 if you want to see the noon-day gun and have time to explore beforehand. The ceremony draws a small crowd; positions on the upper ramparts are best.

Wear comfortable shoes. The castle involves a lot of uneven cobblestones, steps and ramps. Not suitable for pushchairs in the historic sections; the gardens are accessible.

Bring a picnic. The castle gardens are a lovely place to eat lunch, and the café inside is limited. There is no shortage of good bakeries and delis in the town a five-minute walk away.

Photography: excellent throughout, particularly from the ramparts. The best light is in the morning when the sun illuminates the stone walls from the east. Afternoon light is good for views towards Herm and Sark. If you are planning a day trip to either island, see the main Guernsey day trips guide for ferry details.

Combining with other WWII sites: Castle Cornet’s military history connects naturally with the German Underground Hospital and the La Vallette Military Museum nearby. For a full multi-island WWII itinerary, see the Channel Islands WWII occupation guide.

Frequently asked questions — Castle Cornet, Guernsey

Why is Castle Cornet famous?

Castle Cornet is famous for its 800-year history as the guardian of St Peter Port harbour, for its role in the longest siege in English history during the Civil War (1642-1651), for the catastrophic 1672 gunpowder explosion that destroyed the medieval keep, and for housing five museums covering maritime, military and local history. The daily noon-day gun ceremony has been a feature of St Peter Port life since 1857.

How long should I spend at Castle Cornet?

Allow 2-3 hours to see all five museums, the ramparts and the gardens. If you time your arrival to catch the noon-day gun (12:00 daily, April-October), arrive by 11:30. A rushed visit is possible in 90 minutes but you will miss much of the detail.

Is Castle Cornet free?

No. Standard adult admission is approximately £11 (2026 prices). Children are approximately £7, families approximately £29, and under-5s are free. Guernsey residents can enter free with proof of address. Annual monument passes covering multiple Guernsey sites are available at the ticket desk.

Can you visit Castle Cornet without a guided tour?

Yes. The castle is fully self-guided — maps and information panels are provided throughout, and the five museums have their own interpretation. Guided tours are sometimes available in peak season; check at the ticket desk. The self-guided audio tour of St Peter Port also covers the castle.

Is Castle Cornet suitable for children?

Yes, particularly for children aged 7 and up with an interest in history. The noon-day gun is a highlight. Young children may find the uneven cobblestones tiring, and pushchairs are not suitable in the historic sections. The gardens are accessible. Children are sometimes invited to participate in the noon gun ceremony — ask at the ticket desk. For more family-focused planning, see our Guernsey with kids guide and the main Guernsey travel guide for island-wide activities.

Are there other historic sites near Castle Cornet?

Several. Hauteville House (Victor Hugo’s exile home) is a 15-minute walk uphill from the harbour. The La Vallette Military Museum, covering the German occupation, is 15 minutes south along the seafront. The German Underground Hospital is approximately 4 miles from St Peter Port in the St Andrew’s parish. For prehistoric monuments, the dolmens of Vale and north Guernsey are 20 minutes by bus.

Castle Cornet, Guernsey: complete visitor guide for 2026

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