The shelf life of microwave popcorn can vary depending on several factors, including the brand, packaging, and storage conditions. Generally, unopened microwave popcorn bags have a relatively long shelf life and can last anywhere from 6 months to a year or more, depending on the manufacturer's recommendations.
However, it's essential to check the "best by" or "use by" date printed on the packaging. This date indicates the period during which the product is expected to be at its best quality. If the microwave popcorn is past its expiration date, it may not pop as well, and the taste and texture may not be as desirable.
Once you open a bag of microwave popcorn, its shelf life decreases significantly. It is best to consume it within a few days after opening to enjoy the freshest and most flavorful popcorn. Always store opened microwave popcorn in a cool, dry place to maintain its quality.
If the popcorn has an unusual smell, taste, or appearance, it's a sign that it may have gone bad, and it's best not to consume it. When in doubt, it's safer to dispose of old or questionable popcorn and purchase a fresh batch.