After a half dozen zucchinis were harvested, now there isn't a female flower in sight. Plants look ok just not bearing.
I am assuming you must be in the southern part of the country. If it gets really hot, they will stop producing for a while. Are your cucumbers booming? or pumpkins or any other cucurbita putting on female flowers? I had exactly the opposite problem last year with pumpkins. I had female flowers, but no males to fertilize them until later. Ask any gardener, the males come on first to attract the pollinators, then the female flowers to bear fruit. Don't know why, no one could give me an answer, but it happened that way. Same thing this year, but by only a week or two.