How long does opened baking powder last?

Once opened, baking powder will typically stay fresh for around 12 to 18 months if stored properly in a cool, dry place. To maximize its shelf life, store the baking powder in its original container or an airtight container to prevent exposure to moisture and air. It's also important to keep the baking powder away from sources of heat and direct sunlight. After opening, it's recommended to use the baking powder regularly to ensure its freshness.