Tom, do you use cloches? We've found that they really extend the growing season.
Planted more seeds for the fall season tomatoes,broccoli ,zucchini, brussel sprouts and next week some corn.
My garden would be called low ground by my Dad. Floods when it rains and then gets hard as a rock when it starts to dry out. It's the only spot in my yard that gets any sun too. Next year it may become a shed. That's what farmers markets are for I guess.