Van Dyke's salamander is endemic to the western portion of Washington. It occurs in three disjunct areas: on the Olympic Peninsula, in the Willapa Hills, and in the southern Cascade Range. They generally occur in small isolated populations that are usually associated with streams, seepages, and rock outcrops. Van Dyke's Salamander is absent from the eastern slopes of the Cascade Range and Olympic Range, suggesting this salamander's association with high rainfall regions. In coastal areas, it is mostly found in old forest stands that have moderate to high levels of woody debris and fractured rock present. Large decaying conifer logs along streams appear to be important habitat for nesting.