We used to ski at the snowy range mountains, right between Laramie and Saratoga. It is surprising nice for Wyoming. Most people think of the dull., windy, flat Wyoming, but that little range is cool.
If people aren't familiar with the area google " Sugarloaf Mountain Wyoming" or "Medicine Bow...
twin lakes and tourquise lake near Leadville, Colorado have dispersed camping areas around them.
They are high altitude 9,000- 10,000 ft so you have to do it, July/August.
70's in the day time and 40's at night.