How Long Does Swiss Cheese Last?
Opened Swiss cheese lasts 3–4 weeks in the fridge as a block and about 2–3 weeks as slices. An unopened block keeps around 6 months, and it freezes for about 6 months.
Swiss Cheese — opened
shelf life- Unopened: 6 months in the fridge
- Opened, sliced: 2–3 weeks in the fridge
Fridge at 40°F (4°C) or below · freezer at 0°F (−18°C). Freezer times are for best quality; frozen food stays safe longer.
Swiss cheese is a firm, pale cow's milk cheese whose holes, called eyes, are formed by gas from the cultures used to ripen it. It is a little moister and less salty than cheddar or Parmesan, so although an unopened block keeps for months, opened Swiss and especially deli slices dry out and mold sooner than drier hard cheeses.
How to store swiss cheese
- Wrap a block in parchment or cheese paper and then a loose bag; the eyes expose extra surface inside the cheese, so re-cover the cut face closely.
- Keep deli slices in their paper inside a sealed bag or container, and separate a week's worth from the rest if you bought a lot.
- Freeze slices with squares of parchment between them so you can peel off a few at a time for hot sandwiches.
- Store Swiss away from strong-smelling foods; its mild, nutty flavor takes on onion and garlic odors easily.
How to tell if swiss cheese has gone bad
- Blue, green or black mold on the surface or inside the holes; on a block, cut away at least 1 inch around it, but discard moldy slices.
- A slimy or tacky film on slices, often with a sour smell.
- A strong ammonia, sour or barnyard odor instead of a mild, sweet, nutty one.
- Hard, darkened, translucent edges from drying out, which is safe to trim but signals the cheese is past its best.
Bacteria that cause food poisoning usually do not change the look, smell or taste of food. Go by the time limits first, and the signs above second.
Swiss Cheese shelf life chart
| State | Fridge | Freezer | Pantry |
|---|---|---|---|
| Opened | 3–4 weeks | 6 months | Not recommended |
| Unopened | 6 months | 6 months | Not recommended |
| Opened, sliced | 2–3 weeks | 3 months | Not recommended |
| Deli-counter slices have no protective packaging atmosphere; aim to finish them within 2 weeks. | |||
Not safe = perishable: no more than 2 hours at room temperature (1 hour above 90°F / 32°C). Not recommended = possible, but quality suffers or it serves no purpose.
Frequently asked questions
How long does sliced Swiss cheese last in the fridge?
Sliced Swiss cheese lasts about 2–3 weeks once the package is opened or after it is cut at the deli counter. Slices have far more surface area than a block, so they dry and mold faster. Keep them tightly sealed, and discard the pack if slices turn slimy.
Is mold inside the holes of Swiss cheese dangerous?
It should be treated like any other mold on firm cheese. On a solid block, cut away at least 1 inch (2.5 cm) around and beneath the moldy hole, keeping the knife clean, and the rest is fine according to USDA guidance. If several holes are moldy, or the cheese is sliced, throw it away.
Can you freeze Swiss cheese?
Yes, for about 6 months at best quality. It becomes more crumbly after thawing and the slices may break, so frozen Swiss is best for melting on Reubens, burgers, quiche and fondue-style sauces. Thaw it in the fridge and use it within a few days.
Can Swiss cheese sit out on a party platter?
For up to about 2 hours. Swiss is a firm, lower-moisture cheese and is less risky than soft cheeses, but it sweats, dries and curls at room temperature, and the standard 2-hour limit for perishables still applies. Put out small amounts and replenish from the fridge.
Related foods
| Food | Fridge | Freezer | Pantry |
|---|---|---|---|
| Cheddar Cheese Opened |
3–4 weeks | 6 months | Not recommended |
| Parmesan Opened |
3–4 weeks | 6 months | Not recommended |
| American Cheese Opened |
1–2 months | Not recommended | Not safe |
| Shredded Cheese Opened |
1 month | 3–4 months | Not safe |
| Deli Ham Opened |
3–5 days | 1–2 months | Not safe |
| Quiche Cooked |
3–5 days | 2–3 months | Not safe |
Reviewed 2026-09-20. Times follow published USDA FoodKeeper / FSIS, FDA and CDC storage guidance; where sources differ we use the shorter time. How we compile this data.