Out of Date

[HopDen]

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

[alestateyall (tommymorris)]

@HopDen

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.

[jeffy]

@HopDen

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).

[TXFlyGuy (Bel Air Brewing)]

@HopDen

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.

[HopDen]

@HopDen

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?

[HopDen]

@HopDen

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.

[denny]

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.

[dmtaylor (Dave Taylor)]

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.

[rookie_l_a (Steve Ruch)]

@denny

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.

[HopDen]

Glad to read about expired yeast used and working as expected!! Pitched yeast yesterday @ 50* and showing signs of fermentation!!