Author Topic: will freezing hurt liquid yeast?  (Read 1367 times)

Offline Lazy Ant Brewing

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will freezing hurt liquid yeast?
« on: January 06, 2016, 05:04:45 PM »
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, 05:11:20 PM »
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, 06:40:09 PM »
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.

Offline erockrph

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Re: will freezing hurt liquid yeast?
« Reply #3 on: January 06, 2016, 07:27:49 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, 02:11:59 PM »
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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Online tommymorris

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will freezing hurt liquid yeast?
« Reply #5 on: January 17, 2016, 03:02:52 PM »
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.

Offline denny

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Re: will freezing hurt liquid yeast?
« Reply #6 on: January 17, 2016, 04:53:10 PM »
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, 07:21:36 PM »
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.