how to freeze kefir grains without ruining them
FAQs Kefir

Freezing Kefir Grains (without ruining it) – Everything you must know

How To Safely Freeze Kefir Grains For Later Use

Creamy and tangy, kefir is one of life’s little pleasures. Whether it is blended into a fruit smoothie or poured on top of berries or granola, it is an easy and delicious way to add some fantastic probiotic bacterial cultures to your diet. But, what do you do with it if you are going on an extended vacation or decide to take a break from this gut-healthy probiotic food?

Both milk kefir and water kefir grains can be frozen and stored in the freezer for a few months and with a little luck for several years. Follow my steps on how to freeze kefir grains without ruining them. No kefir grains should ever go to waste again.


Why Freeze Kefir

You might find yourself with an overabundance of kefir piling up in your kitchen.
Let’s face it; sometimes, our little fermentation projects can get a little out of hand. I recommend once you have enough grains, it’s a good idea to have a backup set of grains either dehydrated or frozen in your freezer. Then if for some unexpected reason you lose your grains, all is not lost; you grab your spares.


How to Freeze Kefir Grains for Several Months or More

  1. Rinse milk kefir grains thoroughly with milk and drain.
  2. Lay them on a cookie sheet that is covered with a piece of clean unbleached parchment paper
  3. Dry at room temperature for 2-5 days, depending on humidity and room temperature.
  4. Place the sheet in an area that will not be contaminated.
  5. Place dried kefir grains in a bowl and add a little powdered milk to coat the grains. This provided a protective shield on the grains. Organic powdered milk is best, but regular will work fine.
  6. Place dried milk kefir grains in a ziplock bag or glass jar with a plastic lid. To prevent freezer burn double or triple bag your frozen kefir or consider vacuum sealing it.
  7. Store in the freezer for six months to a year.
  8. If you are freezing water kefir grains, skip rinsing with milk or water and just drain them. Also, omit the powdered milk.

how to freeze kefir milk grains without ruining them


Tips for safely Freezing Kefir Grains:

  • The reason for removing as much liquid as possible is to prevent water molecules from expanding during freezing and thus damaging the live organisms which are the grains.
  • There are many reports of people storing kefir grains for a year or more. However, in my opinion, it is wise to err on the side of caution and avoid this long of a freeze if you can.
  • Don’t rinse your kefir grains in water. Cleaning kefir grains does more harm than good because it removes the protective coating of bacteria and yeasts. Says Donna over at

    “I get so many emails from people, who in attempt to help their kefir grains, will rinse them in cool water. You should NEVER EVER EVER do this. It damages them and rinses off the protective bacteria that make them thrive. So many times they will either die or stop reproducing or not make kefir very well after rinsing. Some kefir grains will survive this and be ok, but it still slows them down and damages them and gives me huge amounts of anxiety.” Source:

Reactivating Frozen Kefir Grains

How to Defrost Milk Kefir Grains

When you are ready to use your kefir grains again, follow these simple steps on how to defrost kefir grains.

  1. Place the frozen kefir grains in the refrigerator overnight.
  2. Once the grains have thawed, rinse the powdered milk off with fresh milk.
  3. Drain and add a small amount of fresh milk, just enough to cover the grains and set on the counter to ferment for two days.

**If it is water kefir, then add sugar water

The room temperature should be between 65-75°F (18-25°C). Remember that temperature does play a factor: if it is to warm the fermentation will occur much faster, possibly within 12 -18 hours. If it is colder than it can take up to 48 hours.

If the first batch does not taste right to you then drain and dump the kefir liquid and start a new batch with the grains.
A healthy kefir grain will produce the kefir liquid within 24 hours.

How Do You Know the Kefir is Ready

The kefir is ready when it starts to clump and resemble cottage cheese or rice pudding. it will also produce a clean sour odor that may be slightly yeasty.

At this stage, strain the liquid into a container for drinking and then refrigerate it. You can drink the kefir plain or mix it with some berries for fruity-flavored kefir. Try my delicious banana Kefir smoothie recipe.

After the grains have been stored for some time, they usually need some time to reactivate before you start using them again. To re-use the kefir grains; add them back into the glass jar with another 2 cups of fresh milk to start the fermentation process all-over again.

It could take 2-3 tries or several weeks before the kefir grains are back to producing deliciously flavored kefir.

Final Thoughts…

If you are taking a break from kefir or just have a surplus of kefir grains you want to store, then these steps will help you freeze the grains successfully. With proper care and storage of the grains, you will be able to wake up the grains successfully right away and continue making kefir as before.

You can always share them with your friends and family and spread the joys of this healthy probiotic food.


Hello! I’m Katie, mom, hobby fermenter, gardener, canner, and boundless experimenter. Here at Fermenters Kitchen, our team of enthusiast aims to encourage readers to embark on a fermentation journey with us, one bubbly jar at a time.