Sunflower seeds are a high-protein and high-fiber snack, although they also contain some polyunsaturated fat. Consumers can take a few strategies to keep sunflower seeds fresh and tasting their best.
When sold in commercially packaged bags sunflower seeds typically have a "best by" date stamped on the package. This date can be as far away as one year in seeds packaged with lower than average oxygen content in the air inside the bag. Eat the sunflower seeds before the date if they are stored at room temperature.
Sunflower seeds generally have a room temperature shelf life of two to three months after the package is opened. Seeds stored in the refrigerator or freezer have an extended shelf life of up to 12 months. The shelf life is the same for sunflower seeds in the shell and seeds out of the shell.
For best taste and quality, store sunflower seeds in an airtight container or heavy-duty freezer bag in the refrigerator or freezer to prevent them from exposure to moisture. Seeds may also be stored in a covered container in a cool, dry place.