Can You Use Expired Butter?

Does butter go bad?

Butter won't go bad without noticeable signs. But when butter goes bad, it smells rancid and changes color slightly. Check for any changes in its smell or color if your butter is past its expiration date. Expired butter also tastes sour. Having all that information under your belt, now you can safely taste it to see whether it has gone bad instead of eating too much.