Chicken feed can last for a long time if it is stored properly. However, it is important to check the expiration date on the package before you purchase it. If you are not sure how long your chicken feed will last, you can always contact the manufacturer to find out. They should be able to give you an estimate of how long the feed will last before it goes bad. In general, chicken feed should be stored in a cool, dry place. Avoid storing it in direct sunlight or near heat sources. If you store chicken feed in the freezer, it will last even longer.