Processed mozzarella cheese can be frozen, and it keeps for up to six months in the freezer. Mozzarella cheese loses moisture when frozen and develops a crumbly texture. Because of this texture, thawed mozzarella cheese is only appropriate for uses in which it is melted.
Fresh mozzarella cheese does not freeze as well as processed varieties and is not appropriate for freezing. Thawed mozzarella cannot be substituted in recipes that call for fresh cheese. This is due to differences in flavor and texture. Low-fat mozzarella has more water than full-fat varieties, which affects how much moisture is lost during freezing and how well it melts when thawed.