Recipe(tried): How to Freeze Zucchini

It says to blanch the grated zucchini for baking, but it does work to just grate and freeze it without blanching. If you want slices or chunks, then blanch and freeze.

FREEZING ZUCCHINI

Choose young squash with tender skin. Wash and cut in 1/2-inch slices. Water blanch 3 minutes. Cool promptly, drain and package, leaving 1/2-inch headspace.

Seal, label and freeze.

Grated Zucchini (for baking)
Choose young tender zucchini. Wash and grate. Steam blanch in small quantities 1 to 2 minutes until translucent. Pack in measured amounts into containers, leaving 1/2-inch headspace. Cool by placing the containers in cold water. Seal, label and freeze. If watery when thawed, discard the liquid before using the zucchini.