In my last 12 or so batches, 2 of them were lagers using Saflager dry yeast. I don't tend to favor lagers over ales in general, but they just happened to be two of my favorite homebrews. On those two, I rehydrated as I always do with dry yeasts, sprinkle on 80-90dF water and let sit for 20 minutes. Then I acclimate it to the wort temp by dropping a teaspoon at a time over a few minutes. I pitched both previous lagers at about 60dF and immediately put them in their 54dF ambient environment. I suppose the brief period at elevated temps really helped it take off.
On this last batch, after reading so many posts about pitching at ferment temps, I tried rehydrating at 60dF and pitching into wort in the high 50's. Man, what a lag. I'm at 36 hours and it's just now showing signs of life. Maybe it was a rehydration issue, but I'm thinking it was just a low cell count anyway.
Right now, my opinion is that there's no way to successfully pitch at ferment temps with a dry yeast unless it was propagated through a starter first (of course I'm speaking specifically about lager yeast).
On this last batch, after reading so many posts about pitching at ferment temps, I tried rehydrating at 60dF and pitching into wort in the high 50's. Man, what a lag. I'm at 36 hours and it's just now showing signs of life. Maybe it was a rehydration issue, but I'm thinking it was just a low cell count anyway.
Right now, my opinion is that there's no way to successfully pitch at ferment temps with a dry yeast unless it was propagated through a starter first (of course I'm speaking specifically about lager yeast).