Hello Cindy! Welcome to the Disney Parks Moms Panel.
Many Guests begin planning their Walt Disney World Resort vacations months and even years in advance. One of the most valuable pieces of information that assists in scheduling are the posted Theme Park Hours.
As of this writing (December 9, 2017), Theme Park Hours are released up until June 7th, 2018 online, on the My Disney Experience Mobile App and when booking Advanced Dining Reservations. As we get further into December and into January, you can expect the full Park Hours for June 2018 to be released.
Recently, I have noticed that Walt Disney World Resort has been posting their scheduled Theme Park hours close to the 180-day mark. This coincides with the 180-day window for Guests to begin booking Advanced Dining Reservations at Dining Locations.
Previously, I remember planning with earlier information released by Walt Disney World Resort only to find frequent changes as time passed that required me to alter my scheduled plans. I believe that by releasing the Theme Park Hours a little later, Walt Disney World Resort is hoping to have clearer information that will require fewer changes in the future.