If you have fresh strawberries and bananas that you want to use in your smoothie, you can freeze the fresh fruit ahead of making the recipe. To freeze strawberries for a smoothie, first, rinse them under cold water and let them dry completely. Hull the strawberries and slice them in half to make them easier to blend. Peel the ripe bananas and slice them into pieces. Place the fresh fruit in a single layer on a parchment-lined baking sheet. Freeze flat for 1-2 hours until the fruit hardens. Transfer the frozen fruit to a ziplock freezer bag to keep in the freezer until you're ready to make a homemade Strawberry Banana Smoothie.