To determine the time for fall planting, find your area's average last frost date, calculate the days of growing time your variety needs, and count backwards. In zone 5, our rule of thumb, is the peas go in after the second full moon in July. That takes the calculations out for me and simplifies things. Plus, I like the idea of planting by the moon .
Two years ago I had a great crop of bush beans. The peas were coming along great, but we took down the garden around them which was a hassle, and they were impossible to protect from the deer. I set up barriers of every tomato cage I owned, covered by frost fabric, and the deer got tangled in it and ripped it all up. Now, with the permanent garden, I no longer have those worries. I could even leave root crops in over the winter if I choose.
I actually squeezed FIVE rows into this bed. From left to right are:
Blue Lake Bush Bean
Maestro garden pea (recommended for fall planting)
a yet invisible row of carrots
Survivor garden pea (a leafless variety I've had great luck with)
Goldmine Bush Bean.
This photo was taken a week ago, and everything has doubled in size. I've had to water almost daily, but in the midst of high summer gardening, and the downturn of the cucumbers and summer squash, it's fun to watch something new growing.