Is It OK to Eat Moldy Cheese?
It depends on the cheese type. For hard cheeses (cheddar, parmesan, swiss), cut off the mold with at least 1 inch of margin - the rest is safe to eat. For soft cheeses (brie, cream cheese, cottage cheese), mold penetrates easily and the entire cheese should be discarded. Blue cheese and brie are made with safe mold strains - unwanted mold on these is still a concern.
Key Takeaways
- Hard and semi-hard cheeses have a dense structure that prevents mold roots (mycelia) from penetrating deeply.
- Shredded cheese should be discarded if any mold appears - the strands make cross-contamination likely.
- A white crystalline coating on aged cheddar or parmesan isn't mold - it's tyrosine crystals and perfectly safe.
Explanation
Hard and semi-hard cheeses have a dense structure that prevents mold roots (mycelia) from penetrating deeply. When mold appears on the surface, it hasn't spread far. Cut at least 1 inch around and below the mold spot (don't let the knife touch the mold), and the remaining cheese is safe. Rewrap in fresh wrap.
Soft cheeses have high moisture content and porous texture that allows mold to spread quickly throughout. By the time you see mold on soft cheese, the entire product is likely contaminated. This includes cream cheese, ricotta, cottage cheese, and shredded/crumbled cheeses of any type.
Blue cheeses (Roquefort, Gorgonzola) and white-rind cheeses (Brie, Camembert) are intentionally made with specific safe mold strains. However, if you see fuzzy, different-colored mold (pink, green, black) that's not part of the cheese's normal appearance, the cheese has been contaminated by unwanted mold and should be discarded.
The moisture content of cheese is the primary factor determining mold penetration depth. Hard cheeses like Parmesan contain only 30-35% moisture, creating a dense matrix that limits mold roots to the outer few millimeters. Cheddar at 37% moisture is borderline - mold can be cut away with a 1-inch margin. Soft cheeses like Brie (50-55% moisture) and cream cheese (55-60% moisture) allow mold threads to penetrate the entire product within days, making partial removal unsafe.
Proper cheese storage can prevent unwanted mold in the first place. Wrap cheese in wax paper or parchment paper rather than plastic wrap, which traps moisture against the surface and promotes mold growth. Store at 35-45°F in the crisper drawer where humidity is highest. Hard cheeses last 3-6 weeks when properly wrapped, semi-hard cheeses like Gouda and Swiss last 2-4 weeks, and soft cheeses should be consumed within 1-2 weeks of opening. Replacing the wrapping every time you unwrap the cheese reduces contamination from airborne spores.
Things to Know
- Shredded cheese should be discarded if any mold appears - the strands make cross-contamination likely.
- A white crystalline coating on aged cheddar or parmesan isn't mold - it's tyrosine crystals and perfectly safe.
- Mold on the rind of aged cheeses is usually harmless, but trim if you're concerned.
- Soft-ripened cheeses develop ammonia smell when overripe - unpleasant but not dangerous.