Remove any dirt or debris from the outside of the zucchini by thoroughly washing it. Slice the zucchini into 1/8 or 1/4-inch-thick pieces.
Boil enough water to cover the zucchinis in a pot. Blanch the zucchinis by boiling for two minutes, which prevents them from discoloring and becoming mushy.
Make an ice water bath by filling up a large bowl with water and ice, and let the zucchini sit in the water for about 1-2 minutes.
Remove the zucchini with a slotted spoon or drain in a colander. With a paper towel, gently pat the zucchini as dry as possible after it has drained.
Pre-freeze the zucchini by laying the slices out on a baking sheet and placing these in the freezer.
Once it has frozen for 1-2 hours, transfer to the freezer bags. Using this method, you'll ensure that your zucchini doesn't get stuck together into a large unusable clump. You can store your zucchini for an entire year in well-sealed freezer bags.