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maybe, maybe not. It totally depends on your individual conditions. This is a good explanation. http://chemistry.about.com/b/2012/03/02/can-hot-water-freeze-faster-than-cold-water.htm

In that case, don't do anything. Hens don't drink at night anyway, so if it drops cold enough to freeze at night, no biggie. With temps like that, I would guess that "frozen water" probably means just a crust of ice on top. My girls will happily peck through an ice sheet. If you do...