The shelf life of powdered sugar is indefinite. This product does not have an expiration date, and it does not spoil over time.
Powdered sugar should be stored in air tight containers for best results, as it can harden when it is exposed to air. Powdered sugar should be stored in the pantry and not in the refrigerator. Keeping it in a cool area also extends its longevity.
Powdered sugar is also known as confectioner's sugar. This sugar has a fine granule, and it is mixed with cornstarch or wheat flour. It is often used in baking, and is also used to sweeten drinks.