Rinse and pat berries dry and place them on a baking sheet in the freezer for 24 hours before placing them in a freezer-safe container. This will ensure that the berries endure the least amount of damage and stay in their original form, without clumping together. For more information on how to freeze berries by type, please visit: How to freeze strawberries How to freeze blueberries How to freeze raspberries How to freeze blackberries