Animals just for fun. Now I am in the same quandary as you. My zucchinis are more than ready, the tomatoes are yet a couple of weeks to come, maybe a little bit sooner.
Don't bother to freeze the zucchini. You are making a hardship on yourself. Zucchini and other summer squashes will keep a good couple of months at room temperature. Just put the zucchini, picked off course, into a cool spot, somewhere where they can keep air circulation below the belly of them. To freeze them, then to bring them out to process a short time later would be so unnecessary.
They don't even have to be stored in a cool spot, if you don't have one, just keep them out of the sunshine. Mine are living on my porch right now, on a rack in the shade. I feel confident that come time to process, they will still be good as new.
I would love to get your salsa recipe for zucchini. I never thought about making that type of salsa and there is so much zucchini, sigh, what can you do with it. But into salsa would be simply marvelous!!!
When you have a moment, please do post that recipe, I bet others are in the same boat, those zucchini just seem to love to grow big and lots, and before you turn around, there is another monster one too!! Hope this has helped, and have a most wonderful and great day, CynthiaM.