Parmesan and other hard cheeses, like a young cheddar, can be left out for up to 24 hours without harm. Oiling and drying will occur as a result of it being exposed to the elements, Smukowski explains. You should either put it back in the fridge or toss it if it starts to glisten.

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How long does Parmesan last unrefrigerated?

Unopened, unrefrigerated grated Parmesan cheese will keep for 12 to 18 months at room temperature before losing its best quality.

Can I leave grated Parmesan cheese out?

To be safe, store your Parmesan in the refrigerator at all times. The low moisture content of Parmesan, which makes it less susceptible to bad bacteria, means that large wheels and chunks of the stuff — like those you see on display in stores — don’t need to be refrigerated.

Why does Parmesan cheese not need to be refrigerated?

Many people use a cheese grater to create shredded Parmigiano-Reggiano. You won’t need to keep this cheese refrigerated, but it will last longer if you do.

Can Parmesan cheese be stored at room temperature?

The question is whether or not Parmesan Parmigio Reggiano can be stored at room temperature. Yes, you can keep it at room temperature for a few days, but remember that the fridge is always the best option.