Keeping butter in the refrigerator is the best way to prevent it from spoiling. It significantly slows down the growth of bacteria and mold, which means your butter will last much longer and stay safe to eat. Refrigerating butter also helps it keep its good flavor and nutritional value for a longer period of time.
What the Experts Have to Say
Most food safety experts will tell you that the safest place for butter is in the refrigerator. However, they also agree that it’s okay to keep a small amount of butter out on the counter for a few days, especially if you use it often. To keep it safe, you should use a covered dish to protect the butter from air and other contaminants. “Some sources say it is acceptable to leave butter at room temperature for a couple of days,” as long as it is kept in a sealed container and away from direct sunlight.
