How can you tell if Hard Cheese (Cheddar, Swiss) has gone bad?

Signs that Hard Cheese (Cheddar, Swiss) has gone bad: Fuzzy mold beyond a small spot (1+ inch into the cheese), ammonia smell, slimy or sticky surface. Still good if: Tiny mold spots on the surface — cut at least 1 inch around and below the spot (the FDA-cited rule for hard cheeses).

What does the date label on Hard Cheese (Cheddar, Swiss) mean?

Hard Cheese (Cheddar, Swiss) 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.

Dairy

How long does Hard Cheese (Cheddar, Swiss) last?

Q: How long does Hard Cheese (Cheddar, Swiss) last?

In the fridge: 3–4 weeks. In the freezer: 6 months. Sealed / unopened: Same. Wrap in parchment, then plastic. Small mold spots can be cut off (1 inch around).

High confidence Safety concern

How long does Hard Cheese (Cheddar, Swiss) last? fridge 3–4 weeks, freezer 6 months. Plus spoilage signs, sources, and an unopened-vs-opened note.

Fridge

3–4 weeks

Pantry

Refrigerate only

Freezer

6 months

Sealed / unopened: Same

Signs Hard Cheese (Cheddar, Swiss) has gone bad

Fuzzy mold beyond a small spot (1+ inch into the cheese), ammonia smell, slimy or sticky surface.

Still good if

Tiny mold spots on the surface — cut at least 1 inch around and below the spot (the FDA-cited rule for hard cheeses).

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.

Track this in My Pantry

Get a heads-up before it expires. Search the full database instead.

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.

Reviewed: 2026-05 · Rule: if manufacturer storage instructions are stricter than category guidance, the manufacturer instructions win.