If you're planning to buy a real Christmas tree, the best time to purchase one is typically around mid-November. This allows you to get the tree before the rush of the holidays and gives you plenty of time to decorate and set it up in your home. However, keep in mind that the price of real trees can increase as the holiday season gets closer, so purchasing earlier could be beneficial. Additionally, if you're buying a living tree that you plan to keep and care for, you should research the best time to plant it in your region.