I've lived in Colorado for 12 years. I live at 6700 elev right at the base of the San Juans. My best advice is to hope for the best, plan for the worst! I've seen 1st rifle season hot and I've seen a foot of snow. One thing for sure, you'll get thunderstorms, lightning and rain and tepms down to freezing at night, I'd bet the farm on that. After that ....it's you guess.