Hi Kimberly!
Welcome to the Disney Parks Moms Panel. It's never too early to start planning a trip to Walt Disney World Resort and like you, I know many folks eager to book their 2020 vacation!
You are correct that you can book a room only reservation up to 499 days prior to arrival. For an entire
Walt Disney World vacation package, this calendar is released each summer for the following year. Right now, you are currently able to book a vacation package, including
park tickets and
Disney Dining Plans, through December 2020. For Guests that are looking to visit in 2021, these packages will released sometime in the summer of 2020. As it looks like you are wanting to visit
The Most Magical Place on Earth during
The Most Wonderful Time of the Year, you should be able to book it online already!
I hope this helped to answer your question. Please come back if we can help in any other way!
-Lindsey