It depends on if you are buying a ticket or an Annual pass. Tickets have no blackout dates, annual passes have block out dates depending on the Tier of pass you select (Silver, Gold, Platinum, Platinum Plus, Epcot after 4 or weekday passes.) Check the Disney World app for blackout dates specific to your annual pass if you have one and you link it to a Disney account .
You can find the blackout dates for your specific pass on the My Disney Experience app, just tap on anuall pass blockouts under park info & entry
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