https://www.exploratorium.edu/cooking/bread/yeast_temp.html too cold or hot for the yeast Yeast is so fussy 120-130°F or 49-54°C Yeast Is Fussy About Temperature http://www.exploratorium.edu/cooking/bread/yeast_temp.html thermal death point too cold or hot for the yeast The Science of Cooking: Yeast Is Fussy About Temperature handy dandy chart too cold or hot for the yeast this https://www.exploratorium.edu/cooking/bread/yeast_temp.html 120-130°F or 49-54°C Yeast is so fussy https://www.exploratorium.edu/cooking/bread/yeast_temp.html http://www.exploratorium.edu/cooking/bread/yeast_temp.html при температуре 55—60 °С Yeast Is Fussy About Temperature handy dandy chart