How long does fermented milk last?
There is no single official shelf life for fermented milk, because yogurt, kefir, buttermilk and other types differ. Sealed products last until the date on the pack. Once opened, one food site says kefir keeps up to about two weeks in the fridge. Check the pack and use your nose.
Free download
Milk and Dairy Storage Chart (PDF)
How long milk, plant milks, cream, yogurt and kefir last, opened and unopened. Every line shows its source and the date we read it. Print it and keep it where you store your drinks.
- Cow milk, lactose-free, shelf-stable, almond, soy, oat-style cartons
- Cream, creamers, yogurt, kefir, buttermilk, eggnog: fridge and freezer times
Thank you
Your chart is ready
We use your email only for this download.Also free:
Home Bar Storage Chart (PDF)Juice, Soda and Water Storage Chart (PDF)Coffee, Tea and Hot Drinks Storage Chart (PDF)Drink Strength, Calories and Units Cheat Sheet (PDF)Want the full pack? About 10 printable sheets: a larger chart for each drink type, a “has it gone off?” checklist, date labels, a party planner and an inventory sheet.
In this article
How long does fermented milk last?
Fermented milk is a group of products that includes yogurt, kefir, buttermilk and acidophilus milk. We found no official shelf life that covers them all, so the date on your pack is the best answer. Unopened and refrigerated, use it by that date.
How long does it last once opened?
| Product | After opening, in the fridge |
|---|---|
| Kefir | Up to about two weeks per one food site; follow the brand’s date if it is sooner |
| Acidophilus milk | No number found; use by the date and check smell |
| Yogurt and other types | No official figure found; follow the pack |
The kefir figure is from a consumer food site, not an official source. Fermented milk keeps getting more sour as the cultures keep working, so quality drops before it becomes unsafe.
How should you store it?
- Keep it refrigerated below 40 degrees F (4 degrees C), in a sealed container.
- Store it on a lower shelf near the back, not in the door.
- Write the opening date on the bottle.
- Do not drink from the bottle or use a dirty spoon.
- Do not leave it out for more than two hours.
Can you freeze it?
Kefir can be frozen in an airtight container and is best used within about three months. It may separate after thawing. Acidophilus bacteria survive freezing, but texture can change, so use thawed milk in smoothies or baking.
How do you know it has gone bad?
- Mold on the surface or inside the container
- Heavy curdling or clumping when poured
- A smell that is much more sour than usual, or rotten
- Color changes, such as white kefir turning yellow
A tangy smell is normal for fermented milk. If you are unsure, throw it out.
Who should be extra careful?
Pregnant people, older adults, young children and people with weakened immune systems should follow dates strictly. Ask a doctor if unsure. This is general guidance.
People also ask
How long does opened kefir last?
One food source says up to two weeks refrigerated, or until the brand's date if that is sooner.
Can you freeze fermented milk?
Kefir can be frozen and is best used within about three months. It may separate after thawing.
How can you tell fermented milk has spoiled?
Mold, heavy clumps, a rotten or unusually sour smell or a color change mean discard it.
Sources
About · How we verify this · Editorial policy · Corrections
What would help you most next?
One tap. Anonymous. It helps us decide what to build.
Thank you. The free charts above are yours to keep.
