Now that we have, "discovered", wool we can hunt down to single digits. Something very special about the woods when it is that cold. You can hear everything ! One of my most memorable hunts was going in one morning when we had 8" of fresh overnight snow, then snowed 2-3" more on me while on stand. Never had a more peaceful day in the woods and got to see plenty of deer, just no shots. Stayed on stand 6 hrs and did not want to leave. About 15 degrees and dead calm.

A word of caution about hunting in the cold. I have done it many times in extreme conditions and have no trouble sitting many hours. The thing is that as you get cold your body restricts blood flow to your arms and legs to keep your core and your brain warm. Thats good, but when you get up to leave or find your arrowed game, the blood flows back into those extremeties. They are cold and that chills your blood. When that blood hits your core again it can be dangerous. It drops your core temp. I have been on stand for hours with little discomfort, but by the time I made it to the truck, I was shivering so bad I could hardly open the door. Your body can get used to the cold when you are sitting but be careful. You can get hurt on your way out.