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Old 11-01-2012, 04:36 PM   #1
amrmedic
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Default Yeast too old?

I have found a starter that was in my beer refridgerator for 3 months. It got moved to the back behind some stuff and never noticed it as I switched to a different yeast and have a couple flasks. The starter wort is nice and clear and no funk growth in it. Is it still useable?


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Old 11-01-2012, 04:41 PM   #2
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Absolutely. Just make another starter for it.

I've used washed yeast that was a year old. Took several step-ups, but I believe we underestimate the strength of these little guys.


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Old 11-01-2012, 04:46 PM   #3
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Yea, definitely still good but you'll want to wake up your yeast with a small starter (just decant first) to get back any viability you lost.
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Old 11-01-2012, 04:47 PM   #4
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I've had mixed experiences with yeast 3-4 months old. Sometimes it has worked, others it didn't. Definitely make a yeast starter to judge the viability, and then you will have your answer.
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Old 11-01-2012, 04:48 PM   #5
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Beersmith seems to think a liquid yeast pack that's 3 months past expiry (that's more like 6 months old) still has 30-40% viability. Your starter is probably higher than that.
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Old 11-01-2012, 04:52 PM   #6
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Im sure it is fine. But with time, yeast viability is going to be greatly reduced, and several step ups sounds time and labor heavy. At least compared with getting a new smack pack with 90% viable yeast. I more cautious then most brewers though, I keep my yeast fresh as possible and never go past 6 generations. 3 months just sounds like a long time for a starter, I would feel different if it were properly stored with glycogen and yeast nutrient.


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