How to Preserve Zucchini
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As a summer squash, zucchini can be preserved in several ways. How to preserve zucchini. If you have an abundance of zucchini don’t let it go to waste! Check out these easy ways to save it for later.

As a summer squash zucchini can be preserved in many ways but plain canning is not one of them (except pickled! Pickled is fine).
Here is an article on preserving both winter and summer squash in general. It goes into more details on both winter and summer squash and what can be done with them.
I don’t recommend just substituting zucchini for other vegetables in pickles. But substituting zucchini for cucumber in any tested relish recipe is safe according the the NCFHFP. So if you’ve got a relish recipe for cucumbers that you like. Feel free to sub in your over abundant zucchini!