Age of Fermntis Yeast

[Iowa Brewer]

Hi all,
Brewing a SMaSH Bohemian Pilzner tomorrow (5/21/24) with W-34/70, using BeerSmith 3 as my guide. The yeast I bought from the local HBS' yeast expires 05/2025 and was packaged 4/2022.

According to BeerSmith, 3(!) packets will get me 359.3 billion of the 379.1 billion cells needed. Should I worry about this, or just go ahead and pitch the three 11.5g packets 20b-short?

Here's my ingredients, if useful:
10lb Pilsner Malt
3oz 60min Saaz
2oz 35min Saaz

Water
Ca 6; Mg 2; Na 0; So 7; Cl 10

Thanks!

 

[Hoppy2bmerry]

No need to worry. As long as the yeast was properly stored it can stay viable long after the “expiration date”. Years in fact.

 

[day_trippr]

Pitch 'em. 20B cells out of 379B won't be missed...

Cheers!

 

[Hoppy2bmerry]

Pitch 'em. 20B cells out of 379B won't be missed...

Cheers!

Damn, I need more coffee!

 

[mac_1103]

Unlike liquid, dry yeast shouldn't lose viability as long as the package is intact and it isn't exposed to real extremes of temperature. Your packs are well within the best by date and are likely to be good for years beyond that. So I don't really get the title you chose for the thread.

But anyway, three 11.5 gram packs @ >6B cfu/g is at least 207B cells. The thing is that we don't really know how much work that ">" is doing. So there may be a little more or there may be a lot more and I'm not really sure how Beersmith decided that three packs is 359B cells.

 

[Iowa Brewer]

No need to worry. As long as the yeast was properly stored it can stay viable long after the “expiration date”. Years in fact.

Cheers! It's a great little store, so I'm sure it was kept well. Thanks again

 

[Iowa Brewer]

Pitch 'em. 20B cells out of 379B won't be missed...

Cheers!

Ace, Thanks, day_trippr! That was my thinking, but overthinking is my super power *lol*

 

[Iowa Brewer]

Unlike liquid, dry yeast shouldn't lose viability as long as the package is intact and it isn't exposed to real extremes of temperature. Your packs are well within the best by date and are likely to be good for years beyond that. So I don't really get the title you chose for the thread.

But anyway, three 11.5 gram packs @ >6B cfu/g is at least 207B cells. The thing is that we don't really know how much work that ">" is doing. So there may be a little more or there may be a lot more and I'm not really sure how Beersmith decided that three packs is 359B cells.

Thanks, mac_1103!

 

[hottpeper13]

I would bump that calcium up to at least 50 ppm's using CaCl2. You will have a stronger fermentation and clearer beer.