Lower temps affect attenuation? - Home Brew Forums
Register Now For Free!

Home Brew Forums > Home Brewing Beer > General Beer Discussion > Lower temps affect attenuation?

Thread Tools
Old 04-06-2008, 02:46 PM   #1
Bytor1100's Avatar
Mar 2008
Posts: 544
Liked 2 Times on 1 Posts

All my fermenters sit in my basement which is usually in the 60-65 range. The last two batchs I did, seemed to be a little low on the attenuation side.

First one was a stout extract OG 1.079 and FG 1.033 with White labs Irish Ale
Second was an apricot wheat OG 1.046 and FG 1.013 with Safale US-05

The apricot wheat isn't to bad for att. but the stout seems low. It was definately done fermenting..
30 Gallons - Malty Moe APA

Reply With Quote
Old 04-06-2008, 08:02 PM   #2
Jul 2006
Posts: 320
Liked 17 Times on 13 Posts

As long as you are fermenting within the recommended range for the yeast, you should not see a significant difference in attenuation.

More likely the attenuation variations are a result of ingredients, mash schedule, etc...

Also - using a properly size yeast starter is very important.


Reply With Quote
Old 04-06-2008, 08:42 PM   #3
Nov 2007
Pittsburg, California
Posts: 385
Liked 12 Times on 11 Posts

When fermented at the lower end of a yeast's range (which is not necessarily what the yeast companies claim), yeast become very sensitive to drops in temperature. A drop of only a few degrees, particularly towards the end of fermentation, can cause the yeast to drop out and not finish. It is a good idea to ramp up the temp of fermentation as it progresses, particularly if you are fermenting cold, in order to ensure that the yeast finish fermenting and clean up after themselves.

Reply With Quote
Thread Tools

Similar Threads
Thread Thread Starter Forum Replies Last Post
Help with getting Fermentation Temps lower MrGaryFish Beginners Beer Brewing Forum 13 08-11-2009 02:53 AM
Lower PSI at colder Temps? Beerme01 Bottling/Kegging 5 05-11-2009 10:39 PM
How much do temps affect yeast before pitching? Casey27 Beginners Beer Brewing Forum 3 01-21-2009 05:18 AM
Lower Attenuation = sweeter cider? aliu630 Cider Forum 6 02-01-2008 03:37 AM
Lower Range Attenuation Question RiversC174 Beginners Beer Brewing Forum 8 03-16-2006 01:46 PM

Forum Jump