How Does Temperature Affect Yeast?

The Washington Post/Getty Images/The Washington Post/Getty Images

Yeast becomes more active when warm, but it dies at high temperatures, such as when it is in baking bread in the oven. According to Fleishman's, active dry yeast dissolves and activates best in water that is 100 to 110 degrees Fahrenheit. Once the baker mixes the yeast into dough, he should place it in a warm, draft free area to rise.