The castle was originally built by Red Hugh O'Donnell in 1474 as a stronghold for the powerful O'Donnell clan.
The 17th-century restoration by Basil Brooke included the installation of large mullioned windows typical of Jacobean architecture.
The structure fell into ruin during the 18th century and remained derelict until the Office of Public Works restored it in the 1990s.
The site contains a rare surviving example of a 'double-flue' chimney stack.
Excavations revealed that the castle was built over the remains of an even older earthwork fortification.
Donegal Castle consists of a 15th-century Gaelic tower house built by the O'Donnell chieftains and an adjoining 17th-century Jacobean-style manor house. The structure is located on a rocky outcrop overlooking the River Eske in County Donegal. Following the Flight of the Earls in 1607, the castle was granted to the English captain Basil Brooke, who carried out extensive restorations and added the manor wing. The site features original limestone fireplaces, including one bearing the coat of arms of the Brooke family. Archaeological excavations have uncovered evidence of the original medieval bawn wall and gatehouse. The interior showcases restored oak gabled roofs and period furnishings reflecting its 17th-century status. It is managed by the Office of Public Works and is open to the public for guided tours.
The grassy courtyard area provides the best angle to capture both the medieval tower house and the 17th-century manor wing in one frame.
Join the guided tour to access the upper floor rooms that are otherwise restricted.
Check the official Heritage Ireland website shortly before travel for any unplanned maintenance closures.
The site is compact, so combine a visit with a walk through the nearby town center.
Do not assume you can freely explore the upper levels without a guide, as access is restricted for preservation reasons.
Closed during the winter months, typically from early November through mid-March; closed on specific public holidays.
