Once opened, Cheese (hard such as cheddar, swiss, block parmesan) keeps about 3–4 weeks in the fridge. Unopened, it keeps about 6 months.
| Situation | Keeps for |
|---|---|
| Unopened · fridge | 6 months |
| Opened · fridge | 3–4 weeks |
| Freezer | 6 months |
About 3–4 weeks refrigerated at 40°F (4°C) or below, according to USDA FoodKeeper v128. Refrigerate it once it's open.
Yes — keep Cheese (hard such as cheddar, swiss, block parmesan) at 40°F (4°C) or below once it's open. Refrigerate at 40°F (4°C) or below.
Look for: Sour or off smell; Mould or fuzzy spots; Curdled, slimy, lumpy, or separated texture; Yellowing or other discoloration. Never taste something to test it — when in doubt, throw it out.
Yes — USDA FoodKeeper v128 gives about 6 months in the freezer at 0°F (−18°C). Frozen food stays safe indefinitely; that window is about quality, not safety.