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How long can I store an opened package of dry yeast before I have to use it.

I'm planning on brewing 2.5 gallon batches and using Safale Yeast. Mr. Malty gives the pitch rate as about 5 grams for under 1.050 gravity. The packs are 11.5 grams, and I store them in the refrigerator.

Fermentis recommends using an opened pack within 7 days, but I was wondering if anyone had success with longer storage times.

lud

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I would toss it if I weren't planning on using it in 7 days...dry is cheap...why risk it?

samc

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I'd toss it as well. But several LHBS's repackage some of the Fermentis dry yeasts from bulk into small packets and those seem to do alright. Vacuum sealing in a clean environment is important for long term viability.

ETCS

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I just looked at a package of S-05 I have in the fridge. I states that it should be stored in an airtight container after opening, and be used within 7 days.

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Brewers make wort, Yeast make beer!!!!

llevt

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I have used half a pack for 2.5 gallon batches several times. I fold the package over, tape it shut and stick it back in the fridge. I have stored them for months and have never had a problem... always vigorous fermentation visible within 12-24 hours.

xjbobbin82

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Just thought I'd share my experience.. I've had an open packet of Danstar Nottingham Ale yeast stored in a ziplock bag in my fridge for about a month now, just used the last of it yesterday and fermentation took off great.

Sanitize the packet before opening and handle with clean hands, refrigerate in a clean airtight ziplock bag with as much air pressed out as possible. That is what I do and one month later it seems to be working just as well as when I opened it.

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Bloop...Bloop...Bloop...Zzzz :)

el_caro

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vacuum sealed yeast can be stored in the freezer. Oxygen is the killer.