Once opened, seal the bag or box tightly to maintain freshness. Storing Cereal: Store cereal in a cool, dry place away from sunlight.Higher fat content cereals are prone to rancidity. Cereal Spoilage: While cereals don't technically spoil, signs of decay include insects in the package, a rancid smell, or any abnormal looks or smells.Unopened cereal retains its quality for 6-12 months past this date, while an opened box is still good for at least 4-6 months. Cereal Shelf-life: The 'Best By' date on cereal packaging does not signal its expiration but rather the peak of its taste and texture.So, let's embark on this journey together, digging deep into cereal storage tips, examining cereal freshness duration, and much more.īy the end, you'll be armed with all the knowledge you need to properly store your cereal long term and avoid unnecessary waste. Maybe you're worried about cereal going bad - we've got the answers. If you've ever wondered about cereal shelf life, how long cereal lasts, or even if you can eat cereal past its expiration date, you're in the right place. Welcome to your guide on understanding cereals' longevity, or in other words, 'Does cereal expire?' We'll explore the truth behind this common query, debunking myths and easing concerns about your favorite breakfast companion.