Hi, Karen!
December is my favorite time to travel to Walt Disney World. I absolutely love the holidays, so the lights, decorations, and festivities make me happy!
Park hours are generally posted about 6 months in advance. While hours will be listed, remember that they are subject to change (no worries, if they change it is normally just extending hours!) You may notice that on some nights, the Magic Kingdom will close at 7pm. This is often because of
Mickey's Very Merry Christmas Party. Mickey is just like me - a HUGE fan of Christmas - and he throws the BEST parties. Try to attend on one of these nights if your schedule allows. Separate admission is required.
Once you hit 6 months (180 days) you can also start to book your
dining reservations. Locations such as Cinderella's Royal Table and Be Our Guest fill up quickly, so lock in those reservations as soon as you can. Try to coordinate your dining with the days you will be in each park. You can complete your itinerary by selecting FastPass+ when you are 30 days away from arrival (60 days if you are staying at a Disney Resort hotel).
Wishing you a magical December vacation in Walt Disney World!
Cathy