How long does Parmesan (block) last?
How long does Parmesan (block) last? fridge 2 months, freezer 1 year. Plus spoilage signs, sources, and an unopened-vs-opened note.
Quick answer
Sealed / unopened: Same
Signs Parmesan (block) has gone bad
- Whiskered fuzzy mold, soft or slimy patches, ammonia smell.
- White surface crystals are flavor crystals — not mold.
Discard immediately if
- Mold on soft cheese (brie, cream cheese, ricotta) — discard the whole block
- Sour or rancid smell
- Texture is unusually dry, cracked, or slimy
Why guidance varies
Dairy spoilage depends on initial pasteurization, fridge temperature, and how often the container is opened; manufacturer-printed dates assume continuous storage at 40°F (4°C) or below.
Get a heads-up before it expires. Search the full database instead.
Frequently asked questions
How long does Parmesan (block) last?
In the fridge: 2 months. In the freezer: 1 year. Sealed / unopened: Same. Wrap tightly in plastic wrap or wax paper. Harder cheeses keep longer.
How can you tell if Parmesan (block) has gone bad?
Signs that Parmesan (block) has gone bad: Whiskered fuzzy mold, soft or slimy patches, ammonia smell; White surface crystals are flavor crystals — not mold.
What does the date label on Parmesan (block) mean?
Parmesan (block) usually carries a "Use By" date. The last date the manufacturer recommends for peak quality — for most foods this is still quality-based, not a safety cutoff (infant formula is the one exception). See our date-labels guide for the full breakdown.
Sources for this answer
- A USDA FoodKeeper — Storage windows and refrigeration guidance for this category.
- A USDA FSIS — Food Product Dating — Date-label interpretation and food-safety baseline.