How long does it take to mold grow on yogurt?

Mold can begin to grow on yogurt within a few days of opening, especially if it is not properly stored. Yogurt should be kept in the refrigerator at all times and consumed within a week of opening. To prevent mold growth, keep the yogurt container tightly sealed and avoid introducing any contaminants, such as spoons or fingers, into the container. If you notice any mold on the yogurt, it is best to discard it immediately.