It's a good idea to take down your Christmas tree within the first week of January. This gives you enough time to enjoy the decorations and the spirit of the season, but also ensures that you don't leave your tree up too long, which can cause safety hazards and reduce the tree's longevity. It's important to remember that Christmas trees are meant to be a temporary addition to your home, so taking it down once the holiday season is over is the best way to keep your house looking tidy and organized.