Looks good but you will find that if you have some additional room it would greatly benefit you to space those tomatoes a little more, I would give them at least 12" more room all the way around. When you start picking them, you'll thank me, and it will help keep the branches from running into each other, as they are bound to do.
As for as pumpkin and squash, it takes a LOT of room for most varieties, last year my zucchini sprawled out 6 feet across.

Is summer the time of year to plant broccoli and cauliflower in Iowa? Where I live there's too much heat, but I don't want to pretend to know about other people's climates.

Aside from that, your peppers are heat loving. If that garage to the west creates any afternoon shade, I'd move them to the east and put your broccoli and cauliflower on the west. They'll be more tolerant of the shade.

Here is a link that might be useful: my blog

It will still be cool in Iowa for a few more months. This 80 degree weather is a fluke. From what I hear broc can do well in spring in iowa, but I was waiting until last frost date which is supposedly the end of the month, but since its so warm i may do things sooner. Dunno.

Thanks for the suggestion on the peppers. I am unsure if any shade from the garage will reach them but just in case that's a good idea. I am worried they won't produce at all since it doesn't get hot enough (for long enough) here.

If i make more room for tomatoes I might just stick with those. My husband doesn't think my garden will be very big but I'm trying to remind him how big my tomato plants were last year in the pots. Oh and that's another option, doing the peppers in a pot. I am doing strawberries in a strawberry pot and some herbs in small pots too. :)