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.

Can you eat marshmallow fluff after expiration date?

"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 ...

Do you have to refrigerate Fluffernutter?

The cookies will be good for up to 4 days at room temperature. They may even last a little bit longer. Just taste them, and if they seem too dry, overly moist, or mushy, they will need to be tossed out. You will need to refrigerate the cookie dough before baking them, but they don't have to be after they are made.