Ripe blueberries should be stored in a covered container in the refrigerator, where they will keep for about one week, although they will be freshest if consumed within a few days. Always check blueberries before storing and remove any damaged berries to prevent the spread of mold. But, don't wash blueberries until right before eating, as washing will remove the bloom that protects the fruit's skin from degradation. If kept out at room temperature for more than one day, blueberries may spoil.
Ripe blueberries can also be frozen, although this will slightly change their texture and flavor. Before freezing, wash, drain, and remove any damaged berries. To better ensure uniform texture upon thawing, spread the berries out on a cookie sheet or baking pan, place in the freezer until frozen, then put the berries in a plastic bag for storage in the freezer. Blueberries should last up to one year in the freezer.