How Long Can You Leave Cheese Out?

Softer cheeses, such as mozzarella and cottage cheese, need to remain refrigerated unless they are being used. Hard cheeses, such as Parmesan and Romano, can stay out for longer periods of time. When storing cheese, it is best to use an airtight container or leave the cheese in its original packaging. When cheese is exposed to air, it dries out and can become moldy, according to the Clemson Cooperative Extension.