[2] Various magnates held the castle, most prominently the Percy Earls of Northumberland from the 15th to 17th centuries.
[2] Cockermouth Castle was one of 135 sites from North West England included on the Heritage at Risk Register, maintained by English Heritage and later Historic England.
The entry in the 2008 register noted that the "Majority of Castle in good repair.
[4] The conservation situation was exacerbated in December 2015, when northern England experienced historically heavy rainfall triggering flooding.
The flood defences at Cockermouth were overwhelmed,[5] and the weather caused a landslide near the castle, with the river washing away part its bank; Historic England noted that there was a clear risk to the historic structure.