Oats will work they will just freeze and die when it gets cold. They will be ideal for early season hunting but you will lose them on the first heavy frost. You may also consider throwing some rye in the mix. Im sure you use it but put up some automatic feeders and get the deer coming in early. I feed year round. Its gonna be tough if you are next to a huge wheat field. Your best bet will be catching the deer cross your place going to thiers. If theirs is hunted hard maybe deer will find sanctuary at yours. It doesnt take long for wheat, oats and rye to germinate, if conditions are right. I would plant no later than a month before you need it. Normally I begin to plant in late summer when the season just starts to change and show sign of getting cooler.