Hi Gina,
I'm not very familiar with gardening in your area, but hopefully others here are. I look your location up on Google Maps and it sure looks arid.
I might advise you to buy transplants from a local garden center, if you have one. You can plant those as soon as your beds are ready and they should do very well for you. The main thing is to try to get them in, growing and harvested before the very hot summer gets too underway. You should still have time.
And yes, beans, corn, etc can be direct sown all summer long.