You can freeze buttermilk, and you absolutely should if you don’t think you’ll use it up before it expires. It should stay good in the freezer for about three months — about two and a half months longer than refrigerated buttermilk.
Ask the Test Kitchen: Can you freeze buttermilk?
FAQ
Why can you not freeze buttermilk?
Can I freeze buttermilk in the plastic container?
Does freezing buttermilk change the texture?
Can buttermilk be frozen?
Buttermilk needs to be frozen while it is still fresh. Placing it in the freezer will not revive old buttermilk, so keep in mind that if it is already off, it is best to throw it away. Buttermilk that has been in the refrigerator for more than 2 weeks should not be frozen. When you freeze leftover buttermilk, first check that it has not gone bad.
What is buttermilk substitute? Is it healthy?
Buttermilk substitute is basically a substitute for buttermilk you buy at the store using ingredients you might have at home. One example would be combining milk and lemon juice or vinegar. This gives you the acidity that you need from the buttermilk in specific recipes. Yes, a buttermilk substitute can be healthy in moderation and buttermilk itself can be healthy in moderation
How long does frozen buttermilk last?
Once the milk is frozen, pop the cubes into a ziplock plastic freezer bag. Label the bag, and date it so you’ll know when you should use or toss the frozen buttermilk. Like all frozen foods, buttermilk will keep indefinitely if properly frozen, but it will taste best if used within three months.
Can you freeze buttermilk pre-measured?
It’s more convenient to freeze buttermilk pre-measured in the amounts you will use in future recipes. If you generally use a small amount, freeze the buttermilk in ice cube trays and store the cubes in a freezer bag once they are frozen hard.