The tradition of decorating for Christmas varies by region and culture. In many places, it is common to begin decorating for Christmas in late November or early December. Some people may start even earlier, such as after Halloween or Thanksgiving. The exact timing depends on personal preferences and the availability of time and resources to set up decorations. In some places, the Christmas season is seen as a time for extended festivities, which can last for several weeks or even months leading up to the holiday itself.