Butter keeps about 1–2 months in the fridge at 40°F (4°C) or below, counting from the day you bought it. Frozen, it keeps about 6–9 months.
| Situation | Keeps for |
|---|---|
| Unopened · fridge | 1–2 months |
| Freezer | 6–9 months |
About 1–2 months at 40°F (4°C) or below, according to USDA FoodKeeper v128. That window runs from the day you bought it — FoodKeeper publishes no separate after-opening figure for this one.
Yes — keep Butter at 40°F (4°C) or below. 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 6–9 months in the freezer at 0°F (−18°C). Frozen food stays safe indefinitely; that window is about quality, not safety.