How long does buttermilk last?
Short answer: Buttermilk keeps 1–2 weeks in the fridge and 3 months in the freezer.
Storage chart
| Fridge | Freezer |
|---|---|
| 1–2 weeks | 3 months |
Fridge at 40°F (4°C) or colder, freezer at 0°F (−18°C). Freezer times are for best quality; food kept frozen stays safe indefinitely.
Keep it longer
Keep dairy on a shelf, not in the door, where the temperature swings every time the fridge opens.
Common questions
How long does buttermilk last in the fridge?
1–2 weeks in the refrigerator at 40°F (4°C) or below, according to USDA FoodKeeper data.
Can you freeze buttermilk?
Yes. Frozen at 0°F (−18°C), buttermilk keeps best quality for 3 months. Frozen food stays safe indefinitely; the time is for taste and texture.
How can I tell if buttermilk has gone bad?
Throw it out if you see mold, a slimy texture, an off smell or an odd color. For anything perishable, go by the storage time rather than smell: bacteria that cause food poisoning don't usually change how food looks or smells.
More dairy products & eggs
Source: USDA FoodKeeper data (USDA Food Safety and Inspection Service). Updated 2026-10-13. General information, not medical advice. When in doubt, throw it out.