The Elf on the Shelf tradition officially starts on the first day of December, when the Christmas Elf arrives and hides in a different spot each day to keep an eye on kids' behavior and report back to Santa. However, you can start getting ready for the Elf on the Shelf earlier by preparing a special spot for the Elf to stay and setting up a few fun activities to do with them. This will make the first day even more magical and exciting!