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Raspberries (and blackberries and all those similar) have a short shelf life which is why you rarely see them sold in stores. They might last a day or two but go bad fast (even with refrigeration.) Blueberries also go bad quickly but can last a bit longer. Yes, refrigerate them, but don't wait too long to eat.
Here are the steps you'll need to take: 1  Wash your blueberries in a colandar and pat them completely dry. 2  Sort out any under-ripe, over-ripe, bruised or otherwise damaged berries. 3  Pour the blueberries onto a cookie sheet in a single layer.  Clear out a flat space in your freezer for your cookie sheet.