How long past the expiration date can you use cake frosting?

It's generally not recommended to use cake frosting past its expiration date, but here's a breakdown:

Safest:

* Within the "Best By" date: This is the ideal time to use the frosting for the best flavor and texture.

* Up to a week past the "Best By" date: If the frosting is refrigerated and unopened, it's likely still safe to use, but the texture and flavor may be slightly compromised.

Riskier:

* More than a week past the "Best By" date: The frosting may develop mold or bacteria, especially if it has been exposed to air or temperature fluctuations.

How to tell if it's safe:

* Look for signs of mold: Green or white spots on the frosting are a clear indication it's gone bad.

* Smell for a sour odor: Spoiled frosting will have a pungent, unpleasant smell.

* Check the texture: If the frosting has become watery, separated, or unusually thick, it's probably not safe to use.

Important considerations:

* Type of frosting: Some frostings, like buttercream, tend to last longer than others, like whipped cream frosting.

* Storage: Refrigeration is key to extending the shelf life of frosting.

* Personal preference: If you're not sure, err on the side of caution and discard the frosting.

In short, it's best to use frosting within the "Best By" date for optimal quality. If you do use it past the date, be sure to check for signs of spoilage before using it.