There's some debate over the correct time to hang the Christmas lights. That said, traditionally Thanksgiving weekend marks the time when many Americans flip the switch. There's one simple benefit to hanging lights in November: Warmer weather makes the job more comfortable. Whenever you choose to decorate, check all cords for fraying, and dispose of any damaged strings. Plug in the lights to ground fault circuit interrupter outlets to reduce the risk of electrical fires, and turn off the decorations before you go to sleep.