Food Storage - How long can you keep...


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1-2 weeks after date on package
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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.

Sources: For details about data sources used for food storage information, please click here

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