Raspberries keep well when frozen, but consumers must make sure to purchase ones that are ripe, have a good color and are not mushy. Before freezing the berries, consumers should remove any discolored or bad ones and wash them in a colander with cold water, making sure they're dry before freezing.
To freeze the raspberries, consumers can lay them on a cookie sheet and place them on a flat surface in the freezer so they don't stick together. Consumers can also pack them in freezer bags if they don't mind them sticking together. It is also possible to add sugar to the raspberries before freezing to create a syrup in the bag that protects the fruit from air exposure.