If you sterilize your containers appropriately, and wash the yeast well to remove most or all of the trub, you can keep the yeast a long time. I have done it with yeast about a year old with good results.
Right now, in my yeast fridge, I have about 6-7 different strains that I've washed and will use within the next 6 months or so. I've never tried to use a jar that is more than a year old, though, so I don't really know how long it will actually last.
I have 4 pint mason jars in the kegerator, and was wondering abt temperature - I am now abt 38 deg .. is that ok for the yeast ?
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