Wash and trim the ends. Slice into ½-inch rounds, dice, or shred depending on intended use. Do not peel unless the skin is very tough.
Sliced or diced (for cooking): Blanch slices for 3 minutes in boiling water. Ice bath, drain very thoroughly (zucchini holds a lot of water). Flash freeze on sheet pans, then bag.
Shredded (for baking): Shred raw zucchini using a box grater or food processor. Measure into recipe-sized portions (typically 1 to 2 cups). Pack into freezer bags, press out air, and freeze flat. Do not blanch shredded zucchini.
Puréed: Cook zucchini until tender, purée, and freeze in ice cube trays or small containers. Good for adding nutrition to sauces, smoothies, and baby food.
8 to 10 months (blanched slices). 3 to 4 months (raw shredded). 6 to 8 months (purée).
Slices: cook from frozen. Shredded: thaw in the refrigerator and squeeze out excess moisture before adding to batter. Purée: thaw in the refrigerator.