The seven Ecological-Climatological Zones conform somewhat to the Thirteen Regional Areas. The Alpine, Sub-Alpine and Montane are on both sides of the Rocky Mountains. East or west side of Rockies. Great Plains with elevations running 3,000-5,500 ft. are notable for dry, hot summers, and cold winters. Montane is where altitude increases, 7,500-9,000 ft, causing shortness of breath upon exertion, the growing season is shorter, greater amounts of winter snow and summer rains, and the vegetation tends to be pines, firs and our famous Aspen trees.
Areas are sparser in population with a more individualistic psychology.
Hardest of rugged souls make this there year round home. Alpine Highest of all altitudes 10,500 and above. Very short growing season, a few stunted pine trees, only a few animals and humans make this their home year round, very limited access roads which are, usually, closed from late October until end of May of the next year. But the most spectacular views into all the other regions. You are truly at the summit of the continental United States.