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Home Brew Forums > Home Brewing Beer > All Grain & Partial Mash Brewing > Yeast viability at age
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Old 07-26-2007, 09:13 PM   #1
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Default Yeast viability at age

Well, I've been waiting on some equipment for a while so my yeasties have been in the fridge waiting patiently and I wondered to myself what the loss in viability is with age. I think the born on date has them at June 7 or so, any ideas when losses start to occur?

-RS


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Old 07-26-2007, 09:15 PM   #2
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what kind of yeast is it? wyeast? white labs? dry yeast? most of them have "best before" dates...


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Old 07-26-2007, 11:27 PM   #3
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It's Wyeast American Wheat I think, but I'll check. I think the curiosity is more academic than functional, but still fun to know
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Old 07-26-2007, 11:58 PM   #4
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Quote:
Originally Posted by RedSun
It's Wyeast American Wheat I think, but I'll check. I think the curiosity is more academic than functional, but still fun to know
Check the best by date and the manufacture date and no matter what it says make a starter.

After it leaves Wyeast the viability starts to go down, use this: http://www.mrmalty.com/calc/calc.html it lets you put in the manufacture date to adjust the size of your starter.

BTW, I am 99% sure it will be fine.
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Old 07-27-2007, 12:50 AM   #5
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like he said, make a starter anyway


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