Little is known about the natural history of the white-footed vole (Arborimus albipes). We present new information on habitat, diet and range of this mammal as a result of 13 captures in the southern Cascade Range of western Oregon. The study area represents a range extension for the species. White-footed vole encounters were correlated less with distance to water than with basal area and density of alder (Alnus rubra) and percent cover of hazel (Corylus cornuta v. californica). Association with hazel has not been reported previously. Analysis of white-footed vole fecal samples provided the first documentation of mycophagy in this species and of consumption of hazel pollen from unopened catkins. This latter information supports previous speculation that the white-footed vole is semi-arboreal and provides corroborating evidence for the observed correlation with hazel.