The castle was surrendered to General Ludlow in 1652 after forces were unable to breach its defenses from the land, finally falling due to naval vessels brought up the River Laune.
Legend links the site to O'Donoghue Mór, who is said to reside in a palace at the bottom of Lough Leane and rise every seven years on the first day of May.
The structure is built primarily from local limestone and is a classic example of an Irish tower house with a vault above the first floor to prevent fire from spreading upwards.
Ross Island, where the castle sits, contains evidence of prehistoric copper mining dating back approximately 4,000 years to the Bronze Age.
The tower's original defensive features include a machicolation above the entrance, used to drop stones or liquids on intruders.
Ross Castle is a 15th-century tower house located on the shores of Lough Leane in Killarney National Park. Constructed by the O'Donoghue Ross clan, the structure serves as a representative example of a medieval Irish stronghold. The site features a restored keep accessible only through guided tours that highlight its defensive architecture. Visitors can explore the surrounding limestone landscape of Ross Island. The castle was one of the last strongholds in Munster to surrender to Oliver Cromwell's forces during the Irish Confederate Wars in 1652. Its design includes original stone spiral staircases and defensive murder holes. The grounds contain remnants of defensive bawn walls and ancillary fortifications. The location provides views across the largest of the three Killarney lakes.
The stone pier extending into Lough Leane provides the classic, unobstructed wide-angle view of the tower reflecting in the water.
Book your tour tickets online in advance as they frequently sell out during peak season.
Wear sensible, flat-soled footwear as the internal stone spiral staircases are narrow and uneven.
Allow extra time to walk the trails on Ross Island, which offer distinct views of the castle from the water's edge.
Do not attempt to access the upper floors without a guide, as they are locked for security and preservation reasons.
Closed annually during the winter season; open daily from spring through late autumn.
No photography is allowed inside the internal chambers of the tower; remain with your guide at all times.
