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Author Topic: will freezing hurt liquid yeast?  (Read 7193 times)

Offline Lazy Ant Brewing

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will freezing hurt liquid yeast?
« on: January 06, 2016, 10:04:45 am »
I have a recipe calling for Wyeast 1007 German Ale Yeast.  Neither of the LHBS has it in stock.  If I order it online and it freezes in transit will it work as well as if it had never been frozen?

Thanks in advance for your advice.
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Offline morticaixavier

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Re: will freezing hurt liquid yeast?
« Reply #1 on: January 06, 2016, 10:11:20 am »
no. it will kill a lot of the cells and the ones that survive will be severely weakened. you could make a starter and step it up though.
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Offline Pricelessbrewing

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Re: will freezing hurt liquid yeast?
« Reply #2 on: January 06, 2016, 11:40:09 am »
Freezing definitely hurts liquid yeast. The freezing water solidifies and punctures cell wells, killing the yeast. If you order online and are worried about freezing, you'll want to do a small starter ( like .25L) then step it up.
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Offline erockrph

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Re: will freezing hurt liquid yeast?
« Reply #3 on: January 06, 2016, 12:27:49 pm »
I've received a few smackpacks in slushy condition. I always worry about them, but I've never had any fermentation issues from any of them, starter or not.

I would be concerned if it freezes hard, though. Supposedly K97 is the dry version of this yeast - maybe that's a better option for you?
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Offline Pi

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Re: will freezing hurt liquid yeast?
« Reply #4 on: January 17, 2016, 07:11:59 am »
While we are on the subject, I was wondering about when I should harvest yeast. Got an APA i dry hopped a few days ago and wanted to cold crash. Should i rack to a secondary first and harvest from the cake, or after I crash?
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Offline tommymorris

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will freezing hurt liquid yeast?
« Reply #5 on: January 17, 2016, 08:02:52 am »
Safale German Ale K97 (dry yeast) is supposedly the same as 1007. I have used twice and like the results. Clean and crisp.

I think it's safer to ship dry yeast.
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Online denny

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Re: will freezing hurt liquid yeast?
« Reply #6 on: January 17, 2016, 09:53:10 am »
Quote from: Pi on January 17, 2016, 07:11:59 am
While we are on the subject, I was wondering about when I should harvest yeast. Got an APA i dry hopped a few days ago and wanted to cold crash. Should i rack to a secondary first and harvest from the cake, or after I crash?

I cold crash, package, the save the yeast.
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Offline brewinhard

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Re: will freezing hurt liquid yeast?
« Reply #7 on: January 17, 2016, 12:21:36 pm »
Quote from: denny on January 17, 2016, 09:53:10 am
Quote from: Pi on January 17, 2016, 07:11:59 am
While we are on the subject, I was wondering about when I should harvest yeast. Got an APA i dry hopped a few days ago and wanted to cold crash. Should i rack to a secondary first and harvest from the cake, or after I crash?

I cold crash, package, the save the yeast.

+1. 

And involving freezing yeast, as long as it does not freeze solid you will have enough yeast to make a starter with to properly ferment your wort.
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