Does freezing kill/slow bread mold?

Inactivate the mold growth by placing the items into a freezer. At 0 degrees Fahrenheit or less, mold is no longer able to multiply. However, the cold temperature will not cause the mold to die. Freezing helps in the mold removal process by keeping the problem from getting worse. read more

Mold grows in moist and slightly warm environments (70 to 75 degrees F). You can delay mold growth by choosing a drier bread or one that has preservatives -- not very appealing options at all. However, if you enjoy sourdough, mold need not be an issue. read more

Yes it does. Freezing, or even refrigerating, slows down biological processes, including mold growth. "Many molds can begin growing at 4 °C (39 °F), the temperature within a typical refrigerator, or less. read more