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How Long Can Parmesan Cheese Sit Out?

Most cheeses should only be left at room temperature for two hours. Parmesan, however, like other hard cheeses, is a little more robust.

Its low moisture content makes it hard for bacteria to take root, and while there is no exact time limit for how long Parmesan cheese can sit out, it is recommended that it not be left unrefrigerated for more than four hours. To that end, to ensure its freshness and quality, it's best to store Parmesan cheese in the refrigerator when not in use.

Parmesan Q & A