How long can you store liquid yeast?

[mickey3]

Is it smarter to buy liquid yeast only when you are ready to do a new brew, or could you actually stockpile the yeast and keep it in the fridge? How long does it stay active?

 

[Beerrific]

White labs has a best by date on it. I believe that Wyeast does also. But, even if it is beyond its 'expiration' it can still be used. In either case you should make a starter and adjust the starter size depending on how old it is to pitch the proper amount of yeast.
http://www.mrmalty.com/calc/calc.html

 

[homebrewer_99]

I've successfully used yeast that was expired 2 years.

I wash my yeast. I've used washed yeast that was over 2 years also.

I have a lot of yeast that I washed over a year ago that I still use.

 

[mickey3]

How exactly do you wash yeast?

 

[McKBrew]

Yeast Washing

https://www.homebrewtalk.com/showthread.php?t=41768&highlight=yeast+washing

 

[ohiobrewtus]

I wash yeast as well. The oldest that I've used is 4 months, but this weekend I'll be using a strain that was originally purchased 9 months ago. I keep making starters off of the original, unused in a brew strain. I've used it probably at least a dozen times.

 

[malkore]

I just started washing. So far, so good, and it really saves $$ not having to pay $8 per batch for liquid yeast.