<P> The Rocky Mountains subalpine zone is the biotic zone immediately below tree line in the Rocky Mountains of North America . In Colorado, the subalpine zone occupies elevations approximately from 9,000 to 12,000 feet (2,700 to 3,700 m); while in northern Alberta, the subalpine zone extends from 1,350 to 2,300 metres (4,400 to 7,500 ft). </P> <P> The climate of the Rocky Mountains subalpine zone is never warm, with summer highs reaching 75 ° F (24 ° C) on only the warmest days near the montane zone, and commonly failing to reach 60 ° F (16 ° C) near tree line; Frost may occur any day of the year . Although winter low temperatures may be warmer than those in nearby lower valleys, typically staying above − 10 ° F (− 23 ° C), prodigious snows blanket the region well into spring . Some drifts may linger into summer . Convectional precipitation, typically thunderstorms, often forms rapidly and frequently includes graupel or hail . Although uncommon, hurricane - force winds may develop and cause massive destruction such as the Routt Divide Blowdown . </P>

Where is the subalpine forest located in alberta