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Apr 19, 2013 06:19 AM

Rendered fat - does it last forever? (Storage)

I have some jars of rendered fat in my refrigerator from various years:
* store-bought duck fat used for confit, strained, stored back in fridge (2010/2011)
* rendered duck fat (2012)
* rendered beef fat (1/1/2013)
* making rendered chicken fat today (4/29/2013)

Question is - how long does this stuff last? My searches have told me anywhere from a few weeks to a year, but my duck fat from 2010/2011 still looks good and smells fine... too scared to taste it. I hear about fat going "rancid" - is this an obvious smell?

Also, my beef fat has a thin layer of gunk on the bottom (cheesecloth didn't do a 100% job) - does this affect storage time?

Please share your experiences! I have a LOT of beef fat, and if it's going to go bad soon, I'm going to start gifting fat to people!


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  1. i keep fat in the freezer basically forever. it can get freezer-burned or lose its oomphy flavor, but i have never had it go off. yes, the smell of rancidity is obvious.

    oil with particulates can go off more easily, but it seems relatively fresh? just spoon off the top stuff, leaving the gunk on the bottom and keep the clean oil.

    2 Replies
    1. re: hotoynoodle

      thanks, hotoy! i'll try the freezer option. do you pour the liquid fat into ice cube trays and then transfer to a bag for storage?

      i probably have a quart of fat in a tall jar, and only the bottommost millimeter of the jar has these particulates. i might just chance it because the effort of removing all the fat above it sounds too much!

      1. re: jen223

        nope, just bag it and freeze flat. it never freezes super-solid, so i can just chip/chop pieces off when i need them.

    2. I've never done it but I just read a handy tip:

      Before you pour your rendered fat in your jar, put a thin layer of salt on the bottom. If there's any liquid or meat bits or particulates that settle at the bottom, the salt will help prevent them from spoiling.

      1 Reply
      1. re: seamunky

        oh wow, that's brilliant! never thought of that before, but definitely a good tip

      2. I have tasted rancid bacon and it literally made my tongue tingle like it was burned with acid or something. Not the same but I think you would know.

        1. I buy duck fat on occasion and it seems to keep forever in the fridge. Still snow white, no odor.

          1 Reply
          1. re: c oliver

            so i just tested my old duck fat (circa 2010/2011) that smelled fine, and it did NOT taste fine. it didn't make my tongue tingle, but it just tasted off and not pleasant. too bad... would have been great if it lasted 3 years! still snow white, though.

            my 2012 duck fat, though, still tastes like duck fat! it, however, is not snow white... slightly brown probably b/c i cooked it too long when rendering.

          2. Commercially rendered animal fats will last for ages in the freezer or refrigerator. Home-rendered fats, however, usually contain impurities (e.g. water, blood, protein) that cause the fat to go rancid. I would store these in the freezer for long-term keeping.

            From my experience of one batch of duck fat going rancid after a few months, I couldn't smell anything wrong with it, but the taste was terrible.