 The wilderness lies within the rain shadow of the Olympic Range, resulting in a relatively drier climate.Despite this, the lowland forests (below about 4,000 feet) are still dominated by stands of old-growth western red cedar, western hemlock, and Douglas fir, in addition to numerous understory organisms such as devil's club, salal, thimbleberry, fungi, and mosses.Above about , alpine vegetation prevails where conditions are not too dry.