For Colorado first season anything more than a quality pair of hiking boots with no insulation or a pair of 8" hunting boots with max of 200 gram thinsulate is about right anything more is too much. Wear 2 pairs of socks one a quality liner and another quality thick wool sock not the crap they sell in discount stores or Bass Pro shops will do fine in that kind of weather. If it snows and it is deep than bring along a pair of gaiters....