The Siberian flying squirrel has a wide range in the northern Palaearctic, extending from Finland, Estonia and Latvia eastwards through Russia, Mongolia, northwest China to the Pacific coast (Panteleyev 1998, Sulkava 1999) including the Korean Peninsula and northeast China. It also occurs on the Pacific islands of Sakhalin (Russia) and Hokkaido (Japan). It occurs from sea level up to the tree line (H. Henttonen pers. comm. 2006), and in northern China it occurs up to 2,500 m asl (Smith and Xie, in press). In Mongolia it occurs in forest habitats including the Hövsgöl, Hangai and Hentii mountain ranges, and the western parts of the Mongol Altai Mountain Range.