Frozen Yeast

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davidkrau

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I live in the Chicago berbs and received a shipment yesterday from Minneapolis which included a bottle of WL 400 Belgian Yeast. Due to bad weather it took 2 extra days for the shipment to arrive. Tthe yeast sat in an unheated truck for 4 days at near zero temperature and when it arrived it was frozen solid. I thawed it out and prepared a starter. After about 20 hours I can't tell whether the yeast is dead or alive. My question is does frrezing kill yeast and would I be better off buying some more yeast and be safe. I hate to wreck a whole brew by pitching dead yeast. I know there is another thread covering starters but didn't want to hijack the thread.
 

david_42

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Freezing will kill liquid yeast. Since it was a hard freeze, I think you'll need fresh yeast. If it had been 25F or so, there would be a good chance of revival, but not at 0F.
 

dantodd

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Yep. the problem with freezing is that the water will crystallize and puncture the cell walls of the yeast. You may be able to nurse a few surviving cells to a decent culture but it's too risky regarding infection, takes too much time and may never actually become a viable culture. It would be much easier to simply get good yeast.
 

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