I recommend that you wait until after Thanksgiving to decorate for Christmas. Decorating too early can take away from the magic of the holiday season. Additionally, decorating after Thanksgiving ensures that you're not getting ahead of yourself and are able to fully enjoy each moment leading up to the big day. You should also take into consideration the weather and local regulations when deciding when to decorate. For example, if you live in a region with a lot of snow, you may want to wait until the snow has melted before putting up decorations.