"Cold Start or No Boil Yogurt The traditional way of making yogurt requires you to heat your milk to a temperature of 160 - 180 degrees and then to cool it before adding your yogurt starter. This "scalding" of the milk kills bacteria in the milk before making yogurt. This step is not necessary with the cold start method, because we use a ultra pasteurized, ultra high temp, or shelf stable milk such as Fairlife milk. These milks have already been heated to a very high temperature before being packaged and sold. What..."