Yeast too old? - Home Brew Forums
Register Now For Free!

Home Brew Forums > Home Brewing Beer > Fermentation & Yeast > Yeast too old?

Thread Tools
Old 11-01-2012, 04:36 PM   #1
amrmedic's Avatar
Oct 2008
St Petersburg, Florida
Posts: 304
Liked 3 Times on 3 Posts

I have found a starter that was in my beer refridgerator for 3 months. It got moved to the back behind some stuff and never noticed it as I switched to a different yeast and have a couple flasks. The starter wort is nice and clear and no funk growth in it. Is it still useable?
Eights & Aces Brewery
Dealing life one beer at a time

Reply With Quote
Old 11-01-2012, 04:41 PM   #2
maffewl's Avatar
Jan 2011
Auburn, Alabama
Posts: 1,087
Liked 38 Times on 27 Posts

Absolutely. Just make another starter for it.

I've used washed yeast that was a year old. Took several step-ups, but I believe we underestimate the strength of these little guys.

Digital Temperature Controller build:
Click Here

Bottle Cutter build:
Click Here

Reply With Quote
Old 11-01-2012, 04:46 PM   #3
daksin's Avatar
Aug 2011
San Diego, CA
Posts: 4,617
Liked 357 Times on 311 Posts

Yea, definitely still good but you'll want to wake up your yeast with a small starter (just decant first) to get back any viability you lost.
I can't be arsed to keep up this list of what's in the fermenters, but hey, check out the cool brewery I own! .. ..

Reply With Quote
Old 11-01-2012, 04:47 PM   #4
Jul 2012
Washington, DC
Posts: 280
Liked 67 Times on 49 Posts

I've had mixed experiences with yeast 3-4 months old. Sometimes it has worked, others it didn't. Definitely make a yeast starter to judge the viability, and then you will have your answer.
E Street Brewery

Check out my Oak Aging Survey

Reply With Quote
Old 11-01-2012, 04:48 PM   #5
Aug 2011
Thousand Oaks, CA
Posts: 778
Liked 74 Times on 60 Posts

Beersmith seems to think a liquid yeast pack that's 3 months past expiry (that's more like 6 months old) still has 30-40% viability. Your starter is probably higher than that.
Primary: Beer / Secondary: Beer / Lagering: Old beer.

Reply With Quote
Old 11-01-2012, 04:52 PM   #6
Oct 2012
Fort Collins, CO
Posts: 31

Im sure it is fine. But with time, yeast viability is going to be greatly reduced, and several step ups sounds time and labor heavy. At least compared with getting a new smack pack with 90% viable yeast. I more cautious then most brewers though, I keep my yeast fresh as possible and never go past 6 generations. 3 months just sounds like a long time for a starter, I would feel different if it were properly stored with glycogen and yeast nutrient.

Reply With Quote
Thread Tools

Similar Threads
Thread Thread Starter Forum Replies Last Post
Mocktoberfest (marzen)- should i make a yeast starter with harvested yeast? mhayden37 Fermentation & Yeast 12 02-22-2012 02:24 PM
Creating cider yeast from wine yeast or capturing wild orchard yeast, thoughts???? Daze Cider Forum 4 01-01-2012 03:15 AM
Making a yeast starter from washed yeast. What are some physical signs of success? msa8967 All Grain & Partial Mash Brewing 8 03-16-2011 11:19 AM
Yeast Metabolism: Starters to condition yeast to environment of wort Gremlyn Brew Science 8 04-28-2010 10:34 PM
Made two batches, one with huge yeast slurry, and one with dry Safale-04 yeast. Jolly McStanson General Beer Discussion 4 03-07-2009 08:23 PM

Forum Jump