I have some California Ale Yeast WLP001 that I accidentally put in a corner of my fridge that is near freezing and it has been there for about a month. It's still in liquid form, so I think it should still be ok, but any thoughts?

I'm doing a starter now, which should help it out, but I'd like to know as soon as possible since I'm planning on brewing tomorrow.


The starter will tell the story. If it froze, you might have ruptured yeast cell walls and reduced the viability. A starter will show you how healthy it is and build new cells. If the starter looks good, you'll be fine.

  • 1
    I figured I had nothing to lose other than some DME and a little bit of my time, so I went for it with the starter. Fortunately, the yeast was fine and 24 hours later, brew-day was a success. – senfo Dec 24 '12 at 16:15

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