I live near Tucson. There are several seasons of squash borers.

They are going to get summer squash no matter what I do. The thing that's worked best for me is to get down and search for eggs on the underside of leaves and stems and poke them with a needle. I do this only with the first plants. I never get them all. I also go after borers in the stem with a wire, but you probably know that works maybe half the time.

I just plant squash once a month and enjoy what I want and give away the rest or compost it. I don't bother to preserve summer squash. I don't really like it frozen or canned. When a vine succumbs to borer damage, I pull it up and put it in the burn pile--not the compost pile.

I have heard that planting July 4th avoids most squash bugs in central NM. I am trying it this year.
Good luck

Have you had any difficulty finding squash that late in the stores, or do you grow from seed?

Zucchini mature in 45-55 days so you can have a planting in mid August and have fruit till the first frost.

The past twp years I have waited here (zone 7 Albuquerque)til second week in June to plant the squash seeds & -it may just be luck- but those two years I never had a problem with squash bugs. Had heard that the heaviest squash bug egg laying is finished by June so will try my luck again by planting next week! I had squash really producing great when earlier planted neighbor's squash was past their prime so who knows?!

What's the latest I can plant zucchini seeds in south Georgia