capt82
Well-Known Member
Why is dry yeast in coolers when you buy them? Dry yeast can die if too hot. Yeast is a living organism that requires a specific temperature range to survive. The ideal temperature for dry yeast is between 38°F and 50°F. If exposed to temperatures above 55°F, the yeast may start to deteriorate or die.I've never had a pack of dry yeast fail, and I'm pretty sure it would take temperatures much higher than the back of a UPS truck on a summer day to hurt dry yeast. That's kind of the point of drying it.
High temperatures can cause the yeast to dehydrate, denature, generate off-flavors/aromas, and affect the quality. Temperatures above 65°F can significantly reduce the viability and activity of the yeast. If dry yeast is at temperatures above 75°F for an extended period, it's likely to be dead or nearly dead.
I've never had dry yeast "fail" either, but every home brewer has had a batch with off flavors, poor attenuation, or failures to reach OG/FG. Yeast issues?