How To: Freeze Buttermilk

Let’s talk about buttermilk for a minute.

Over the past year or so I’ve slowly become convinced that buttermilk is one of the most underrated ingredients at the grocery store. It used to be one of those things that I’d see at the store and wonder who ever bought it, but now I totally get it.

What is buttermilk? Well, it’s not milk with butter added to it (in case you were wondering). It’s a cultured milk product, like yogurt or kefir. Basically, a specific type of bacteria has been introduced to the milk and allowed to grow. As the bacteria grows, it eats up the natural milk sugars and produces an acid byproduct. The acid denatures the milk proteins, causing the texture to thicken up – just like when heat denatures the proteins in egg whites and turns them from a liquid into a solid. All of this “culturing” action produces a unique, tangy flavor and thick, creamy texture.

Buttermilk is useful in baking because of its acid pH, which can help leaven muffins, biscuits, and other baked goods. There are many ways you can substitute buttermilk if you don’t have any on hand (see a few options here), but the problem with these substitutes is that, while they do provide acid, they do not provide that unique buttermilk flavor.

And boy, oh boy does buttermilk ever have a unique flavor. Granted, I could never drink a glass of it plain (some people enjoy it that way), but when used in recipes it adds the most amazing flavor. Substitutions no longer cut it for me. I need the real thing.

The other awesome thing about buttermilk is its rich and creamy texture. The thick texture is a result of the culturing process and not the fat content, so even if you buy a low-fat buttermilk it will still add a thick, creamy texture to whatever you’re using it in. That’s a major bonus when making dips, dressings, and soups.

But what are you gonna do? Buy a whole quart of buttermilk, use a cup, and then let the rest go bad in the back of your fridge? I’ll admit, I’ve done that a few times. But then I came across this little gem of a technique! Freezing buttermilk is easy and it’s as good as fresh once thawed!

So, promise me that the next time you come across a recipe that calls for buttermilk, you’ll actually go buy a quart, use it, and then freeze the rest. Because you’re going to love it.

Step By Step Photos

Before you freeze, make sure to measure the volume of your ice cube tray wells. This way you’ll know how many buttermilk cubes you need to thaw for any given recipe. I have that cute little shot glass measuring cup (1 oz.), but you could also use measuring spoons. My wells were 1.5 Tbsp in volume, which means I’d need to thaw 12 cubes to make one cup. Make sure you write the volume down somewhere, so that you don’t forget. HINT: 1 fluid ounce = 2 Tbsp.

pour buttermilk
Give the buttermilk a good shake and then carefully pour it into the ice cube tray. It will be a little bubbly or frothy, but that’s okay. I filled up about two ice cube trays with my leftover buttermilk.

Let the cubes completely freeze. You don’t want to leave the cubes in the tray where they’ll be exposed to air and dry out or absorb rogue flavors from your freezer. So, once they’re frozen you will want to transfer them to a freezer bag. Make sure to label and date the bag. You could also record the volume of the cubes on the bag so that it’s always right there where you can find it. If the cubes are stuck in the tray, just let it sit for a minute or so and the outside edges will melt a little and they should loosen right up.

Transfer the cubes to the freezer bag and then pop them back in the freezer. Now you have buttermilk ready to go whenever you need it!

I thawed out some buttermilk cubes to make these Whole Wheat Oatmeal Pancakes and it worked beautifully! The buttermilk separates a little when thawing, but a quick stir mixes it right back up (buttermilk tends to separate when refrigerated, too).

Want some other recipe to use buttermilk in? Try: Taco Ranch Dressing, Creamy Avocado Dressing, Ranch Chops, or Whole Wheat Oatmeal Pancakes.


  1. Oh man! I never realized you could do this! I’ve been trying to just do recipes that call for buttermilk all at the same time so it doesn’t go to waste. Thanks for the tip!

  2. how many cubes for 1/2 cup or 1 cup buttermilk? good to know for baking. tx

    • It’s going to depend on the size of your ice cube tray wells and how full you fill them. You’ll need to measure your individual trays to be sure.

  3. Hey, thank you for sharing the love. I am a home cook, I do all sort of crazy stuff. My pancakes butter starts with a sourdough starter that I keep for pizza and bread, eggs, some (real) maple syrup, and today I’m introducing “bulgarian” buttermilk. Hope sour(dough) + sour(milk) is not too much. We’ll know soon. Thank you for the tip on freezing, I was thinking the same, am I really going to use one cup and throw three? Cheers! Leo

  4. Joyce says:

    Great advice! I only occasionally have a need for buttermilk, but recognize that it adds a unique flavor and texture wherever it’s called for. I thought on one grocery trip that I’d seen powdered buttermilk, which I thought was brilliant, but too expensive, so I passed it by. Now I have a recipe calling for buttermilk, and the powdered stuff wasn’t there, so I bought a quart….thinking I’d have to waste most of it.

    So good to know I can freeze the leftovers, and use in other dishes. This is a great tip!

  5. aas24118 says:

    Does freezing kill the good bacteria in the buttermilk? I use 1 T buttermilk in 2cup heavy cream to make Greek style yogurt, so need the culture to be active.

  6. Elizabeth says:

    Thank you! I have some buttermilk to use up later this week and was not sure what to do with the rest of it.

  7. Arely says:

    How long is the expiration of butter milk?

    • I’m not sure. A lot of food doesn’t have an exact expiration date, but rather a “best if used by” date. They don’t go “bad” per se, but diminish in flavor and texture over time. Freezing will prolong the freshness considerably, but again there isn’t a exact guideline for when it should be thrown away.

  8. Niki F. says:

    I make homemade buttermilk ranch dressing and was wondering if I could still use the thawed cubes in the dressing? Or is it better to use these only for baking/cooking with? Thank you!

    • I think you can still use the cubes. I thawed some to make some pancakes and after they thawed they just needed a quick stir to get back to a normal consistency.

  9. Leftover buttermilk in the fridge? Check. No plans to use it? Check. Ice cube trays? ……. Now I’ve got to run to the store to get some! Thanks for the tip!

  10. This is brilliant! I never even thought of doing this, despite doing similar things with other important, but not often used, ingredients (like celery). I often substitute milk even though I know something tastes better with buttermilk, just because it either means planning ahead or an extra trip, etc. I love buttermilk in pancakes, bran muffins, and with my favorite salad dressing, Uncle Dan’s. Buttermilk as back on my shopping list! Thanks for your blog by the way, I just discovered it though someone who mentioned it on Mr. Money Mustache.

  11. SoRefined says:

    Whether or not buttermilk is available is kind of touch and go at my local grocery store, so I keep powdered buttermilk onhand. That seems to work well, though I think I would wait around for actual buttermilk if I was making pancakes or something like that.

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