Supalpine Larch is a deciduous conifer that grows in the Rocky Mountains of Idaho, Montana, British Columbia and Alberta with a small disjunct population in the Cascades of Washington. It grows at high altitudes (1,800 to 2,400 m, 5,900 to 7,900 ft). We went to see the larches at Cutthroat Pass mid-October and they were at their peak. We did not see them, though, until we reaches those higher altitudes at which they grow.