It’s only too cold to duck hunt if it’s unsafe to be out there. The main danger in duck hunting is getting wet in frigid temps. Duck hunters die almost every year from hypothermia when they go overboard on cold days. However, if you dress appropriately and stay (safely) out of the water, you can duck hunt in almost any conditions. Consider safety for the dogs as well. Even the hardiest duck dogs can succumb to hypothermia if their owners send them out irresponsibly.