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Home Brew Forums > Home Brewing Beer > Fermentation & Yeast > Froze my Wyeast in the packet by accident!
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Old 01-22-2013, 06:37 PM   #1
bierzwinski
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Default Froze my Wyeast in the packet by accident!

It is winter and my fridge in the garage froze some of my yeast packs. I don't think this is going to ruin anything, but would like some confirmation from you guys.

They are now thawed. I don't know how long they were frozen.

Does anyone think this might have ruined them? I'm going to make starters with them so I won't ruin a batch of beer.

Thanks for the help.

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Old 01-22-2013, 07:26 PM   #2
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Make a starter. It'll be fine.

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Old 01-22-2013, 07:50 PM   #3
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If the yeast actually froze, it will die. You can try smacking the packs and seeing if they swell, and if they do then make a starter to increase the cell count.

When yeast freeze, the cells rupture when they thaw.

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Old 01-22-2013, 11:19 PM   #4
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I agree, I had a wyeast pack freeze in shipping from an online HBS. I let it thaw, smacked it and let it sit out for a bit and it never really expanded. I made a 1qt starter to see if it came back to life. It had a little action in it, but never really took off on the fermentation. I was up against a time crunch and didn't trust what appeared to me as a weak starter. I got new yeast, pitched it and threw in the starter for good measure. Been 5 days in the primary now, started bubbling really well in first 24 hours, kicked off nicely.

For me it was better safe than sorry, a 45 min round trip to the LBHS and $6 for a new smackpack.

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Old 01-23-2013, 12:09 AM   #5
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@ Yooper - I kind of thought that was the case. Damn it!!! :-)

Thanks for the input guys. I really appreciate it.

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