I have hunted the past 3 years out there in Colorado with the most recent trips during second season. We hunt south central Colorado and don't seem to get the snow they do further north. We always get snow and cold but probably not to the extent that they get up north. Good boots are a must and i always dress in layers. Most of the time I wear a pair of uninsulated rain wearpants on the bottom. They are quality made Cabelas and keep me dry and stop the wind which is always there. They are quiet and light enough to keep me warm and not allow me to sweat when hiking up. All I wear under them is mid weight insulated long underwear. If I get up near 11K feet or higher it is colder and I can slip on a pair of warmer pants whichI keep in the pack. On top I wear an insulated flannel shirt under the rain jacket with a warmer jacket in the pack for use when sitting when it is cold. Up in the mountains I have seen it 65 degrees one day and near zero the next so you have to be ready for extremes. Good luck.