If you haven't already started your winter vegetable seeds, now is definately the time to do it. Verging on to late late but, if you get your seeds in now (Aug16) you should be okay.
August is also the time to look around local nurseries for sets or winter vegetables. My local organic nursery (The Garden Path) has a winter plant sale from August 25 to Septemer 4th (or around the 4th). Anyway, the point being that already started plants should be in the ground by the beginning of september such that the roots and develop.
I planted Kohlrabi, Red Kale, Green Kale, Bright Lights Swiss Chard, Perpetual Spinach and... something else in July. I will be buying a purple variety of Cauliflower and some other neat stuff at the plant sale.
Ask around your area to see if there are any nifty plant sales in your neck of the woods and be sure to post them in this thread.