Mine grew just fine in the Pacific NW, but then got a rash of bugs, little silvery beetle creatures. Couldn't bring myself to kill the bugs, and I figured if I let them eat zucchini, then they would leave my tomatoes alone. It worked.

Sister in Utah had a tremendous crop this year. Vines crawling all the way to the house from the garden (15ft pumpkin vine) and I happened to be on the phone with her one day while she was out weeding and she kept finding enormous acorns, butternuts, spaghettis and bananas. I figure, if you want squash, move to Utah. :)