Between the forest is dominated by the pacific silver fir tree near State Route 20 at Rainy Pass. Also at this elevation, the western hemlock is replaced by the mountain hemlock as a dominant species. At elevations between in the subalpine zone, the forest gives way to meadows dominated by grasses and flowering plants and shrubs. Above lies the alpine zone where few plant species survive aside from some sparse grasses, the occasional shrub and lichens. A warming climate has led to an altitude adjustment for many flora species, with the timberline reaching further up the mountain slopes since the 1960s.