They are best stored in the freezer in airtight plastic bags or containers. (joyofbaking.com)
If you can't eat all your zucchini before it goes bad, pickle and can it, bake it into zucchini bread and freeze the loaves, or grate it and pack it into airtight plastic bags, and freeze. (bonappetit.com)
When boxing them up for the year, it is best to put them in airtight plastic bags. (dresshead.com)