(Phoenix, AZ) -- Crews are putting up Christmas decorations in the middle of the heat wave. Organizers for ZooLights at the Phoenix Zoo say they need to be finished with their holiday displays by Halloween, so they need to get started now. Some of the workers are starting on the decorations around 3 o'clock in the morning while others start later in the day to avoid working during the hottest part of the day. The ZooLights celebration is expected to kick off around Thanksgiving and run through January.