You bought fresh mozzarella for a caprese salad and have half a ball left in the fridge. Or there is a block of low-moisture mozzarella that has been open for two weeks. Or a bag of shredded mozzarella you are not sure about. Does mozzarella cheese go bad?
The short answer: Yes, mozzarella goes bad, but the timeline depends entirely on which type you have. Fresh mozzarella in brine lasts 5 to 7 days after opening when kept submerged. Without liquid, it lasts 2 to 3 days. Low-moisture block mozzarella lasts 3 to 4 weeks opened. Shredded mozzarella lasts 5 to 7 days after opening. These are four different products with four different answers. And mold on fresh mozzarella means discard the entire piece immediately. Unlike hard cheese, you cannot cut around it.
For a full overview of how dairy and perishable foods compare on shelf life, visit our Complete Food Storage Guide.
Key Takeaways
Fresh mozzarella in brine (opened): 5 to 7 days submerged; 2 to 3 days without liquid.
Fresh mozzarella (unopened): 1 to 2 weeks per USDA; follow the use-by date.
Low-moisture block (opened): 3 to 4 weeks well wrapped.
Shredded mozzarella (opened): 5 to 7 days in a sealed bag or container.
Mold on fresh mozzarella = discard the entire piece. Unlike hard cheese, you cannot cut around mold in soft, high-moisture cheese.
A bloated bag before opening is a clear spoilage sign. Discard without tasting.
Sour-smelling fresh mozzarella may still be safe to cook with but is past its best for eating fresh.
The 2-hour rule applies. Mozzarella left at room temperature for more than 2 hours should be discarded.
Four Types of Mozzarella Cheese, Four Different Shelf Lives
Most people treat mozzarella as one product. It is not. The mozzarella on a caprese salad, the block you shred for pizza, and the bag of pre-shredded from the dairy aisle all behave differently in storage. Getting the right rule to the right product avoids both unnecessary waste and food safety mistakes.
The Four Products and Their Rules
Fresh mozzarella in brine or liquid (the soft balls or logs sold in a pouch, tub, or vacuum pack filled with water or whey) is the most perishable form. It is extremely high in moisture, sometimes exceeding 50% water content, and spoils faster than any other mozzarella type. According to USDA guidance for soft cheeses including fresh mozzarella, it lasts 1 to 2 weeks refrigerated. Once opened, submerged in liquid, it lasts 5 to 7 days. Out of liquid, 2 to 3 days.
Fresh mozzarella without its brine: If you discarded the liquid or bought fresh mozzarella without packaging liquid, it dries out quickly and loses quality faster. Wrap tightly in plastic wrap or make your own brine (1 teaspoon of salt dissolved in 1 cup of water) and submerge. Change the brine every 1 to 2 days.
Low-moisture block or sliced mozzarella (the firm, drier mozzarella used for pizza and cooking, sold in blocks, logs, or pre-sliced) has had significantly more moisture removed. This lower moisture content m
