The decorations for Christmas at Disney World start being put up as early as mid-November, but the majority of the decorations are typically put up in the days leading up to Thanksgiving. The holiday decor is usually fully on display by the first week of December, and the parks stay beautifully decorated throughout the month of December. You can expect to see a wide variety of Christmas trees, garlands, wreaths, lights, and other decorations that make Disney World a magical place to celebrate the holiday season.