How Long Does Mozzarella Last? Fresh, Shredded, and Block, Explained

You bought a ball of fresh mozzarella for a caprese salad on Tuesday. Today is Sunday. Is it still good?

The answer depends entirely on which kind of mozzarella you bought. Fresh mozzarella, low-moisture block mozzarella, & pre-shredded mozzarella all have wildly different shelf lives, & most “mozzarella shelf life” advice on the internet lumps them together, which gets people confused. Here is the real breakdown from a Wisconsin cheesemaker, plus how to tell when your mozzarella has actually gone bad.

Key Takeaways

• Fresh mozzarella (the wet ball kind): 7 days unopened, 2-3 days opened.

• Low-moisture block mozzarella: 3-4 weeks unopened, 2 weeks opened.

• Pre-shredded mozzarella: 3-4 weeks unopened, 5-7 days opened.

• For a longer-lasting fresh cheese, try our Wisconsin Cheese Curds (2-week fridge life with the squeak intact).

• Smell & texture tell you it's bad. Not the date on the package.

The Two Kinds of Mozzarella (& Why It Matters)

Before we talk shelf life, we have to clear up the confusion. “Mozzarella” refers to two products that are almost different foods:

• Fresh mozzarella: soft, wet, ball-shaped, packed in water or brine. High moisture, short shelf life. Used for caprese, on top of pizza, or eaten fresh.

• Low-moisture mozzarella: firm, yellow-tinted, sold as a block or pre-shredded. Aged briefly to reduce moisture. Long shelf life. Used for pizza baking, lasagna, casseroles.

Their shelf lives are wildly different. Fresh mozzarella starts losing quality within a week; low-moisture mozzarella can last over a month. Same name, different rules. For a broader look at cheese storage, see our cheese storage 101 pillar.

The Complete Mozzarella Shelf Life Chart

These numbers assume proper refrigeration (below 40°F) & a sealed container after opening. Freezer times below.

How Long Does Fresh Mozzarella Last?

Fresh mozzarella is the trickiest. High moisture means it is basically a fresh cheese with a very short window.

Unopened, in its original water or brine, fresh mozzarella lasts 7-10 days in the fridge. Some brands print an “use by” date, which is usually accurate.

Once opened, the clock speeds up. Refrigerate what you don't use immediately, submerged in fresh cold water in a sealed container. Change the water every 24 hours. Even with that care, plan to use it within 2-3 days for the best texture & flavor.

Dry-packed fresh mozzarella (the kind sold in a plastic wrap without water) has a slightly shorter shelf life than water-packed. Same rules apply.

How Long Does Low-Moisture Mozzarella Last?

Low-moisture block mozzarella is much more forgiving. Because most of the water was removed during production, bacteria has less to work with.

Unopened, low-moisture block mozzarella lasts 3-4 weeks in the fridge past the printed date. Sometimes longer if it's vacuum-sealed.

Opened, wrapped tightly in parchment then plastic, it keeps 2 weeks. You may see mild dryness on cut edges over time; trim off the dry spots & the rest is fine.

How Long Does Shredded Mozzarella Last?

Pre-shredded mozzarella is coated in cellulose to prevent clumping, which slows down bacterial growth. Unopened, it keeps 3-4 weeks in the fridge.

Opened, that changes. The cellulose coating breaks down once air hits it, & the shredded surface area is much bigger than a block, so bacteria multiply faster. Plan on 5-7 days after opening.

If you want it to last longer: freeze it. Pre-shredded mozzarella freezes remarkably well because the cellulose coating prevents clumping in the freezer too. Shake the bag & throw it in the freezer for up to 6 months. Use directly on hot pizza or in cooked dishes.

How to Tell If Mozzarella Has Gone Bad

Ignore the date on the package. Look at these signs:

Fresh Mozzarella (Gone Bad)

• Cloudy, yellow, or off-smelling water (not the milky-white it started as)

• Sour, tangy smell instead of milky-fresh

• Slimy or sticky surface

• Visible mold spots (pink, green, or fuzzy)

• Yellowish tinge across the surface (not the natural pale white)

Low-Moisture / Shredded Mozzarella (Gone Bad)

• Visible mold anywhere on the cheese

• Ammonia-like smell (not the mild dairy smell it should have)

• Slimy or wet-feeling surface (should be dry)

• Discoloration to gray or greenish-gray

• Sharp, sour, or off flavor when you taste a small piece

Can You Cut Mold Off Mozzarella?

No. This is the key difference between hard aged cheeses (like cheddar) & soft fresh cheeses (like mozzarella).

On hard cheeses, you can cut 1 inch around any mold spot & the rest is safe. On soft, high-moisture cheeses like fresh mozzarella, mold spreads invisibly throughout the cheese via microscopic threads called “hyphae.” Cutting off the visible spot doesn't remove the mold that's already in the rest of the block.

Rule: any visible mold on fresh mozzarella means the entire ball goes in the trash. Same rule for burrata & shredded mozzarella. Only firm aged cheeses can be salvaged after mold appears. For the full shelf-life picture across every cheese type, see our shelf life guide by type.

Can You Freeze Mozzarella?

Depends on the kind.

General rule: mozzarella that's meant to melt (block, shredded) freezes well because thawing texture doesn't matter once it's on a hot pizza. Mozzarella that's meant to be eaten fresh (a caprese ball, burrata) loses its delicate texture when frozen & won't recover.

If you want a Wisconsin fresh cheese that actually freezes beautifully AND squeaks when it thaws, our Wisconsin Cheese Curds are a legitimate alternative. Same fresh-cheese category as mozzarella, way more character.

How to Store Mozzarella Properly

Fresh Mozzarella

Keep it in its original brine or water. Once opened, transfer any leftovers to a fresh container of cold water & change the water daily. Never wrap fresh mozzarella in plastic wrap directly. It needs the water to stay fresh.

Low-Moisture Block

Wrap in parchment paper first, then loosely in plastic wrap. Store in the coldest part of the fridge (usually the back of a lower shelf). Don't freeze until you know you won't use it in the next 2 weeks. See our cheese storage 101 pillar for the full wrapping method.

Pre-Shredded

Once opened, transfer to a sealed zip-top bag & press out as much air as possible. Or freeze the whole bag if you know you won't use it in a week.

FAQ

How long does fresh mozzarella last in the fridge?

7-10 days unopened, 2-3 days after opening. Keep it submerged in cold water in a sealed container, & change the water every 24 hours after opening.

How long does mozzarella last after opening?

Depends on the type. Fresh mozzarella: 2-3 days. Low-moisture block: 2 weeks. Pre-shredded: 5-7 days.

Can you eat mozzarella after the expiration date?

Yes, if it still looks & smells right. Expiration dates are conservative estimates. Trust your senses over the date printed on the package. Sour smell, slimy texture, or visible mold means throw it out. Otherwise, taste a small piece.

How long does mozzarella last in the freezer?

Low-moisture & shredded mozzarella freeze well for 4-6 months. Fresh mozzarella & burrata don't freeze well; their delicate texture breaks down.

Does mozzarella cheese go bad in the fridge?

Yes. Fresh mozzarella goes bad quickly (within a week). Low-moisture varieties last longer (up to a month) but eventually mold or dry out. Refrigeration slows spoilage; it doesn't stop it.

How can you tell if mozzarella has gone bad?

Fresh mozzarella: cloudy water, sour smell, slimy surface, visible mold. Low-moisture mozzarella: visible mold, ammonia smell, wet or slimy surface, sharp off-flavor. When in doubt, throw it out.

Can you cut mold off mozzarella?

No. Soft, high-moisture cheeses like fresh mozzarella spread mold invisibly through the entire block. Any visible mold means the whole ball goes in the trash. Only hard aged cheeses (like cheddar) can be salvaged after mold appears.

Is it safe to eat old mozzarella?

Old but not spoiled: yes. Spoiled: no. “Old” means past the printed date but still smelling & looking normal, which is fine. “Spoiled” means slimy, moldy, sour, or off-colored, which means throw it out.

Mozzarella has more shelf-life variables than most cheeses, but the rules are simple once you know which kind you have. For a longer-lasting fresh cheese with more character than mozzarella, try our Wisconsin Cheese Curds (which last 2 weeks in the fridge & freeze beautifully) or our Draw-String-Cheese Whips for the string-cheese format that keeps for months. Browse the full cheese collection for options built to last.