well if you look at it from a scientific stand point, scent molecules are goingto slow down and move a lot less in colder temps than in warmer temps, can they smell you still still?Yes forsure, but I believe from all my cold weather hunting both here in Idaho, ND now and back in Alberta and Montana... once those temps drop below zero, I always seem to notice a littler higher tolerance by deer in and around me say 20 yards or less.. Just my 2 cents..