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Old 12-20-2013, 10:01 AM   #1
ShaneHed13
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Default Does Yeast Die

I've read a ton of stuff on here, saving yeast, fermenting at temps from 35f to 90f and it sounds like it's all fine. It seems like yeast don't die... They go dormant (at lower temps). So my question is, as noob as it is... And I promise I'll get better... What's good temps for what. I'm making a nut brown ale tomorrow and I was told that an ambient temp of 62 would be fine given the temp the yeast itself makes. Just want to be on my game tomorrow. I'll take pics for scrutinization/feedback. :-)

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Old 12-20-2013, 10:18 AM   #2
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62 sounds about right. What yeast are you using?

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Old 12-20-2013, 11:38 AM   #3
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Be guided by your yeast, expect the wort to 5-6 degs C higher than the ambient environment temperature.

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Old 12-20-2013, 12:10 PM   #4
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Does yeast die? Actually, it moves on to a wonderful place where it has all the maltose it can eat.

To answer your question about temperature, yes, yeast dies at temperatures low enough that the water inside the cell freezes, expands, and bursts the cell. The upper limit is around 120F to 140F.

For brewing temps, see How to Brew and for yeast death temps see this thread on HBT

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Old 12-20-2013, 12:32 PM   #5
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If you add a little glycerol and cool it slowly, you can store yeast at -80 or below indefinitely.

http://www.homebrewtalk.com/f13/guid...st-bank-35891/

In the lab I worked in, we used a Mr. Frosty (http://www.thermoscientific.com/en/p...container.html which cools at a rate of -1 C/min; the perfect cooling rate for freezing cells.

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Old 12-20-2013, 12:47 PM   #6
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Quote:
Originally Posted by Epimetheus
Does yeast die? Actually, it moves on to a wonderful place where it has all the maltose it can eat.
SWMBO told me it went to a nice farm upstate where it had lots of room to run free and tons of other yeasts to play with, but now I'm beginning to wonder if she was just trying to make me feel better.
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