How Long Does Unopened Buttermilk Last? - StillTasty

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How Long Does Unopened Buttermilk Last?

BUTTERMILK, FRESH, FLUID, COMMERCIALLY PACKAGED — UNOPENED

Refrigerator

1-2 weeks after date on package Freezer

3 months

How long does unopened buttermilk last? The precise answer to that question depends to a large extent on storage conditions - to maximize the shelf life of unopened buttermilk, keep it refrigerated at all times.
How long does unopened buttermilk last in the fridge? Unopened buttermilk will generally stay at best quality for about 1 to 2 weeks after the date on the package, assuming it has been continuously refrigerated.
To maximize the shelf of unopened buttermilk, do not store it on the fridge door, as the temperature is too warm - the unopened buttermilk will last longer when stored in the main body of the refrigerator, in its original package.
To further extend the shelf life of buttermilk, freeze it; frozen buttermilk will often become separated and the texture may become somewhat grainy, but it is usually acceptable for cooking and baking purposes.
Freeze buttermilk in an airtight container and leave at least 1/2 inch headspace at the top, as buttermilk will expand when frozen; thaw in refrigerator.
How long does buttermilk last in the freezer? Properly stored, it will maintain best quality for about 3 months, but will remain safe beyond that time.
The freezer time shown is for best quality only - buttermilk that has been kept constantly frozen at 0° F will keep safe indefinitely.
How to tell if buttermilk is bad? The best way is to smell and look at the buttermilk: signs of bad buttermilk are an off smell, off color and a thick or clumpy texture.

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