Dairy
How long does Buttermilk / Chaas last?
Medium confidence
Safety concern
How long does Buttermilk / Chaas last? fridge 2–3 days, pantry Up to 1 day (cool weather). Plus spoilage signs, sources, and an unopened-vs-opened note.
Fridge
2–3 days
Pantry
Up to 1 day (cool weather)
Freezer
Not recommended
Sealed / unopened: Check date (packaged cartons)
Signs Buttermilk / Chaas has gone bad
- Sharp, vinegary, or sulfurous smell.
- Layers that won't recombine even after a good shake.
- Fizzing or visible bubbling.
Still good if
- Slight separation that re-emulsifies smoothly with a stir or shake.
Discard immediately if
- Fizzy or carbonated texture
- Pungent or strongly sour smell
- A clean shake fails to restore a smooth texture
Why guidance varies
Chaas is a thin, watery cultured drink, often with added salt, coriander, or curry leaves, so it acidifies and spoils fast; fresh herbs speed this up. Indian ambient temperatures sharply reduce any room-temperature window.
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Sources for this answer
- A USDA FoodKeeper — Storage thresholds for buttermilk and cultured liquid dairy.
- A FSSAI — Cold-chain and danger-zone limits for perishable dairy beverages in India.