The tourist attraction was due to open on March 27 but this has now been delayed ‘for the foreseeable future’.
A spokesperson for Alnwick Castle said: “Following Government advice, we have taken the decision to delay the opening of Alnwick Castle to visitors for the foreseeable future.
“This is in the interest of looking after the health and well-being of our visitors, employees and the wider community.
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“All tickets booked for a visit between March 27 and June 30 will receive a full refund and our team will be in touch in due course.
“We will be monitoring the situation closely. Updated information will be available on the Alnwick Castle website as and when things change.
“The wider Northumberland Estates business will continue to operate normally as far as possible, and is contactable through the usual channels.”
Hulne Park will remain open to the public. Usual rules apply: free of charge, open 11am until sunset and no dogs allowed.