There is no set rule on when to take down a Christmas tree, as it largely depends on personal preference. Some people choose to keep their tree up until the start of the new year, while others may take it down after the holiday season. It's also important to consider the condition of the tree, as a dried-out or damaged tree should be removed promptly to avoid a fire hazard. Ultimately, the decision to take down a Christmas tree is up to each individual and their own traditions.