Home Brew Forums > Home Brewing Beer > General Techniques > Why Cold Crash?
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Old 04-19-2014, 02:13 AM   #1
McLovinBeast577
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Default Why Cold Crash?

I'm wondering 3 things....

1. What are the reasons for cold crashing? In other words, what does it accomplish?

2. At what stages in the homebrew process do people cold crash and why do they do it at that stage?

3. What temperature do you have to get it down to in order to successfully cold crash your beer?


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Old 04-19-2014, 02:21 AM   #2
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1. To make the yeast drop out and clear your beer.
2. Just before packaging for the reason listed above.
3. As cold as you can without freezing.


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Old 04-19-2014, 02:21 AM   #3
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The quick response:

1. It helps to clarify the beer

2. You cold crash after fermentation is complete.

3 I would imagine any tempature under 50 degrees would be acceptable. I continuely dump ice into the container that holds my ferment (which is surrounded by water) for 2 days and I see excellent results.

I'm sure you can find specific answers.
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Old 04-19-2014, 02:54 AM   #4
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Okay cool. I also heard people cold crash so that they can add certain ingredients like molasses or fruit without having the yeast ferment out any of the flavors...?
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Old 04-19-2014, 02:58 AM   #5
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fwiw, even if ^that^ made any sense, cold crashing will not remove all of the yeast...

Cheers!
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Old 04-19-2014, 03:18 AM   #6
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As above plus one of my regular brews says to dry hop during the cold crash.
http://www.homebrewtalk.com/f12/can-...5/#post2256000
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Old 04-19-2014, 03:34 AM   #7
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Yep. It helps to clear your beer and is done when fermentation is done. I also do it because I keg, and CO2 is more readily absorbed in colder liquids. Beer is cold. CO2 is cold. I drink sooner.
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Old 04-19-2014, 03:37 AM   #8
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So when taken back to room temperature the yeasties will stay flocculated, correct?
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Old 04-19-2014, 03:39 AM   #9
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I started cold crashing the last 2 batches. I'm drinking a beer o kegged last night and its clear
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Old 04-19-2014, 03:40 AM   #10
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Quote:
Originally Posted by McLovinBeast577 View Post
Okay cool. I also heard people cold crash so that they can add certain ingredients like molasses or fruit without having the yeast ferment out any of the flavors...?
Not a workable plan. Even after a week-long crash at in the mid-30's, there's still plenty of yeast in the beer to eat that stuff once it warms up to a temp at which the yeast can operate. Now, if in addition to crashing you add potassium sorbate (0.5 tsp per gallon) when you rack out of the primary, you can flavor and sweeten without the yeast going to town on it. I do that on my ciders (which use ale yeast), but then if I want to carb them up, I must do so with a CO2 tank/reg.

Other benefits of crashing are that it really helps to firm up the trub layer (making it harder to pick up in the siphon) and results in much less bottle trub if you sugar carb. I do mine at 35*F for 5-7 days.

Quote:
Originally Posted by McLovinBeast577 View Post
So when taken back to room temperature the yeasties will stay flocculated, correct?
Not as well as if you prime/bottle it cold. There's no reason to warm it back up before bottling. Once the beer inside the bottles warms up, the yeast will wake up and eat the priming sugar.


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