Author Topic: Out of Date  (Read 485 times)

Offline HopDen

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Out of Date
« on: July 24, 2022, 10:09:40 am »
I purchased 5 Diamond Lager yeast pkg's a few weeks ago and one pkg was soft. Merchant replaced but I never checked the pkg they sent and just placed it in the fridge, wrong friggin yeast. My bad!!

I found 2 pkg's of Diamond in my keezer with a exp date of 10/21.

2 questions: 1- Is the yeast to far expired to be viable?
                   2- If I use it, do you think it will make much of an impact on yeast cell count?

17 gallon/64L batch @ 1.050 OG
Low end of the pitching rate is 1g/L



Offline tommymorris

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Re: Out of Date
« Reply #1 on: July 24, 2022, 10:28:42 am »
I purchased 5 Diamond Lager yeast pkg's a few weeks ago and one pkg was soft. Merchant replaced but I never checked the pkg they sent and just placed it in the fridge, wrong friggin yeast. My bad!!

I found 2 pkg's of Diamond in my keezer with a exp date of 10/21.

2 questions: 1- Is the yeast to far expired to be viable?
                   2- If I use it, do you think it will make much of an impact on yeast cell count?

17 gallon/64L batch @ 1.050 OG
Low end of the pitching rate is 1g/L
I have used dry yeast, including lager strains, 1-2 years past expiration date multiple times without problems.

I brew small batches; 3 gallons. So cell count has never been an issue for me.

Offline jeffy

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Re: Out of Date
« Reply #2 on: July 24, 2022, 12:02:29 pm »
I purchased 5 Diamond Lager yeast pkg's a few weeks ago and one pkg was soft. Merchant replaced but I never checked the pkg they sent and just placed it in the fridge, wrong friggin yeast. My bad!!

I found 2 pkg's of Diamond in my keezer with a exp date of 10/21.

2 questions: 1- Is the yeast to far expired to be viable?
                   2- If I use it, do you think it will make much of an impact on yeast cell count?

17 gallon/64L batch @ 1.050 OG
Low end of the pitching rate is 1g/L
I have used dry yeast, including lager strains, 1-2 years past expiration date multiple times without problems.
I brew small batches; 3 gallons. So cell count has never been an issue for me.

I have had good results with dry yeast well past the expiration date, (but they have always been kept in the fridge).
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Offline Bel Air Brewing

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Re: Out of Date
« Reply #3 on: July 24, 2022, 12:13:55 pm »
I purchased 5 Diamond Lager yeast pkg's a few weeks ago and one pkg was soft. Merchant replaced but I never checked the pkg they sent and just placed it in the fridge, wrong friggin yeast. My bad!!

I found 2 pkg's of Diamond in my keezer with a exp date of 10/21.

2 questions: 1- Is the yeast to far expired to be viable?
                   2- If I use it, do you think it will make much of an impact on yeast cell count?

17 gallon/64L batch @ 1.050 OG
Low end of the pitching rate is 1g/L

Where did you buy this yeast from?

Label Peelers is notorious for shipping old (VERY OLD) yeast.
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Offline HopDen

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Re: Out of Date
« Reply #4 on: July 24, 2022, 12:19:39 pm »
I purchased 5 Diamond Lager yeast pkg's a few weeks ago and one pkg was soft. Merchant replaced but I never checked the pkg they sent and just placed it in the fridge, wrong friggin yeast. My bad!!

I found 2 pkg's of Diamond in my keezer with a exp date of 10/21.

2 questions: 1- Is the yeast to far expired to be viable?
                   2- If I use it, do you think it will make much of an impact on yeast cell count?

17 gallon/64L batch @ 1.050 OG
Low end of the pitching rate is 1g/L
I have used dry yeast, including lager strains, 1-2 years past expiration date multiple times without problems.

I brew small batches; 3 gallons. So cell count has never been an issue for me.

1-2 years is quite some time. I would be leery of trying but is definitely reassuring that they still performed well.

On a side note, I wonder at what batch size does cell count begin to make a noticeable difference?

Offline HopDen

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Re: Out of Date
« Reply #5 on: July 24, 2022, 12:21:06 pm »
I purchased 5 Diamond Lager yeast pkg's a few weeks ago and one pkg was soft. Merchant replaced but I never checked the pkg they sent and just placed it in the fridge, wrong friggin yeast. My bad!!

I found 2 pkg's of Diamond in my keezer with a exp date of 10/21.

2 questions: 1- Is the yeast to far expired to be viable?
                   2- If I use it, do you think it will make much of an impact on yeast cell count?

17 gallon/64L batch @ 1.050 OG
Low end of the pitching rate is 1g/L

Where did you buy this yeast from?

Label Peelers is notorious for shipping old (VERY OLD) yeast.

It wasn't shipped past its exp date. I had them in my keezer for a while.

Offline denny

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Re: Out of Date
« Reply #6 on: July 24, 2022, 02:46:30 pm »
My contacts at Lallemand have confirmed to me that dry yeast is good for years past the date. 3 years at least. Looking for the email and I'll post if I find it.
« Last Edit: July 24, 2022, 02:48:59 pm by denny »
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Offline dmtaylor

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Re: Out of Date
« Reply #7 on: July 24, 2022, 05:57:29 pm »
Dry yeast lasts nearly forever in refrigeration, with very little loss in viability.  Many many many years.  Your yeast is still perfectly good.  About 3 packs is all you need for 17 gallons, or 4 packs if you want to get fancy.  Good to go.
Dave

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Offline Steve Ruch

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Re: Out of Date
« Reply #8 on: July 25, 2022, 08:30:20 am »
My contacts at Lallemand have confirmed to me that dry yeast is good for years past the date. 3 years at least. Looking for the email and I'll post if I find it.
Last year I brewed a 3 gallon batch of bitter with a  6 gram pack of Muntons dated Nov 2016 that turned out fine.
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Offline BrewnWKopperKat

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Re: Out of Date
« Reply #9 on: July 25, 2022, 08:42:29 am »
old (VERY OLD) yeast.

Are you referring to this?   https://www.homebrewersassociation.org/forum/index.php?topic=38116.0

US-56 with a 'use by' date of Sept 2007.  Any idea if OP (of that topic) tried to made a starter?
« Last Edit: July 25, 2022, 09:44:48 am by BrewnWKopperKat »

Offline HopDen

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Re: Out of Date
« Reply #10 on: July 25, 2022, 03:58:51 pm »
Glad to read about expired yeast used and working as expected!! Pitched yeast yesterday @ 50* and showing signs of fermentation!!