The firm has already been shut for several weeks – but today announced the shutdown will extend into and past the May half term school holiday.
Butlin’s has three resorts – at Skegness, Minehead and Bognor Regis.
A spokesman said: “In line with current Government advice, we’ve taken the decision to extend the closure of our resorts until June 7.
“This will include our May half term breaks, which we know will be disappointing, but these are unprecedented times for everyone. We’ll get through this and back to providing great breaks for you all when the time is right.
“In the meantime, we want to give you as much reassurance as possible.
“Our wonderful contact centre team are on hand ready to help re-plan your break.
“They have the necessary equipment and support to be able to work safely from home and have already processed thousands of requests.
“We have also introduced our new “Coronavirus Book With Confidence Guarantee” to give you extra peace of mind during this period.
“If your break has been affected, you will receive an email, SMS or letter from us asking you to fill in a form.
“Please note, we will respond to everyone. We are working through in date order and please don’t worry if your break is coming up soon or your arrival date passes and you haven’t heard from us, all of your options remain open to you.
“For more information, including our new Coronavirus Book with Confidence Guarantee, please visit www.butlins.com/resortupdates
“We would also like to take this opportunity to thank all of our guests who have already been impacted by cancellations for your patience and support.
“We’re really pleased so many of you have chosen to move your dates to later this year or next we look forward to welcoming you back to Butlin’s soon.”