I think -15F was the coldest I've hunted. The main road up the mountain was frozen/iced over so we drove that on an ATV. Not sure how much colder it was with the "wind chill" from the ATV ride. I don't think I'd care to hunt much colder than that... 
“There are three things all wise men fear: the sea in storm, a night with no moon, and the anger of a gentle man.”
― Patrick Rothfuss, The Wise Man's Fear
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