When the snow gets about foot and a half or two feet deep. The cow will come down to less snow, so their calves can feed. Ice, that stays on for days, will also bring them down. Like several hunters have told you, watch the wind direction & keep on top of it. Because wind direction can change in 50 feet of travel. Also make sure you have at least two flashlights & batteries & bulbs.... ever try to change a bulb in the dark?? That's whyyou need two. I don't remember, but I'm sure someone said something about a collapsible bone saw. When you get in an area that there is elk, never make a sudden movement( turn your eyes first) then slowly move your head. If you can't see anything geton the ground and look for movement....you just might see a elk with their head down looking in your direction. Also when elk are around go slow, real slow...Good Hunting & Good Luck