Don't fret about the deer not hitting your beans early, it means you have good natural browse. Late summer is our biggest stress period for deer, i'll have peas waist high in July and then in 2 weeks there wont be anything but vines. I'm thinking seriously about not planting summer plots, except for perrenial clover. Just throw some white clover into your cereal grains and it should last until August, maybe longer with adequate rainfall.