Pick fully-ripe, firm strawberries with a deep red color. Wash berries in several changes of cold water. If you want to freeze the berries whole you will want to remove the stems and place the berries in several rows on a cookie sheet and freeze. When the berries are frozen then place them in a large freezer bag and store in the freezer. You can also mix 1 cup of sugar with 6 cups of cut berries and place in pint freezer container.