Butter
The answer
Butter lasts 1–2 months in the fridge and 6–9 months in the freezer.
Caution Salted butter can sit covered at room temperature for a day or two; keep unsalted butter refrigerated.
How long it keeps
Fridge (40°F) 1–2 months safe window
Freezer (0°F) 6–9 months best quality
Room temp 1–2 days (salted, covered dish) then discard
Discard Discard butter that smells sour or rancid, or shows mold.
By state & packaging
State Fridge Freezer
Refrigerated 1–2 months 6–9 months
Room temperature, salted, covered — —
Signs it has gone bad
✕ Sour or rancid smell
✕ Dark yellow outer layer with pale interior
✕ Mold spots
FAQ
Is it safe to leave butter on the counter?
Salted butter in a covered dish is fine for a day or two. For longer than that, or for unsalted butter, refrigerate it.