Unopened marshmallow fluff can last for up to 8 months when stored in the pantry, in a dark and cool environment. Once again, you will need to check the best-by or expiration date on the packaging and work with that timeline as well. Once opened, marshmallow fluff can last between 2-4 months.

Is it safe to eat expired marshmallow fluff?

"Best By,” “Best if Used By,” and “Use By” dates on commercially packaged foods sold in the United States represent the manufacturer's estimate of how long the product will remain at peak quality — in most cases, the creme will still be safe to consume after that date, as long as it has been stored properly and the ...

Does fluff need to be refrigerated?

How should Marshmallow Fluff be stored? Fluff can be stored at room temperature. If you don't plan on using your Fluff for a while, refrigeration will extend the shelf life significantly.