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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.

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up vote 4 down vote accepted

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.

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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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