I was given a basic “Irish Red” starter kit (containing a packet of Lallemand Nottingham Ale yeast) for Christmas but have just got around to opening and reading the instructions. It seems that I should have kept the yeast in a cool place (i.e. fridge) but, unfortunately, it’s been stored in a location that can get quite warm (high 60’s/early 70’s). Should I just buy a new packet or is what I have still usable?
Some extra information. Dry yeast will lose up to 20% viability per year when stored at 68°F. This was an answer referring to a wine yeast. Does it apply to all dry yeast, no clue. http://www.danstaryeast.com/articles/storage-dry-yeast
I think for the $4 I would buy a spare and if not needed it is always handy to have some dry yeast on hand for an emergency. Toss it in the fridge and some day if you have a batch that won’t take off it will be very handy.