Washed yeast how long does it last?

[JONNYROTTEN]

Ive got a few mason jars of us 05 in the fridge for about 6 months.Is it still good? Don't want to ruin a batch but if I can use it,why not.I haven't opened them since I put them in the fridge

 

[olotti]

I just used some washe wlp500 in my Belgian IPA that was fine after making a nice starter for it. From what I gather as long as it's in the fridge and you make a starter it should be fine. But that's why a starter helps as if the yeast is not viable then you'll know when you make the starter.

 

[wilserbrewer]

I guess the answer is the cost of a packet, known to be what it is vs the cost of making a starter. I keep slurries in the fridge as well, tough question when to let go....

 

[RM-MN]

Here's an article on the loss of viability from yeast stored in refrigeration. http://www.woodlandbrew.com/2012/12/refrigeration-effects-on-yeast-viability.html

 

[AQUILAS]

Brulosopher just did an article where he pitched an old slurry, I believe about 5 months old at day of pitch.

I'd probably make a starter with it just to get them going.