Krausen on yeast starter

[Captjasonh]

Last week I was scheduled to do a brew using WLP001. I did an overnight yeast starter as I always do on my stir plate. Unfortunately the next day the weather ruined my Brewing plans so I decided to save the yeast. I cold crashed and decanted as I always would and stored the yeast in a sterilized mason jar in the fridge.
Today I made a new starter and pitched the yeast and within a few minutes had a thick active krausen on my starter. Is this normal? I have never had krausen in my starter before?

 

[day_trippr]

You started with enough fresh yeast to do a full batch of beer

 

[Captjasonh]

Thank you, should I pull the starter or just let it go until tomorrow’s brew day?

 

[day_trippr]

It might do more harm than good to stop it now, so I'd let it go and pitch the whole thing tomorrow. Many folks would call this a "vitality starter", so you're not out of bounds with that.

I'm surprised you've never noticed krausen in your starters. There've been times I woke up to starter krausen all over my desk through pushing the e-flask capacity (got a 5 liter one and solved that problem )

Cheers!