you should have put them back out right before the snow started, used waxed dirt or peat moss, that way, after the snow falls there is NO trace of you being there, and all the critters smells is your bait/lure coming up thru the snow. since they cant see the bait hole, they will work the set longer and get caught, when dealing with snow, you want to either take a snow shovel and clear a big area down to the dirt, or hang snares in your tire tracks as you drive thru the fields. good luck and happy trapping.