How long does Kefir last?
In the fridge: 7 days
In the freezer: 60 days
Kefir lasts about 1 week past the printed date when sealed and refrigerated below 4°C, often a few days longer because its live cultures resist many spoilage bacteria. Once opened, expect 7–10 days before flavor becomes too tart or fizzy. Mild fizziness and tartness are normal (it's a fermented product); a harsh sour-rotten smell or fuzzy mold are not. Shake before pouring; natural separation is normal.
How to store it
- Middle or back shelf, sealed
- Shake before pouring
- Return to fridge promptly after pouring
- Don't store in door — temperature swings
- Freeze only for smoothies
Signs it has gone bad
- Sharp rotten or putrid smell
- Fuzzy mold on surface
- Bitter or chemical taste
- Slimy or stringy texture
Signs it has gone bad
How long does kefir last after opening?
Opened kefir lasts 7–10 days in the fridge below 4°C. Sealed often lasts a week past the date.
Is fizzy kefir bad?
Mild fizz is normal — kefir is fermented. Strong fizziness, harsh smell, or bitter taste mean it's past its prime.
Can you freeze kefir?
Yes for smoothies. The live cultures mostly die, so it's no longer a probiotic after thawing.