What happens to frozen Cool Whip when it is outdated?

Cool Whip, whether frozen or not, does not have an expiration date, but a "best if used by" date, just like many other dairy products. While it still maintains safety for some additional period depending on how it has been stored, its quality starts to fade. Frozen Cool Whip may develop an undesirable color, texture, or flavor if kept frozen unsealed for prolonged periods due to freezer burn. It should typically be thawed and consumed, or tossed, on or before the indicated date for the highest quality experience.