Prefers coniferous forests, but also found in mixed hardwood forests. In northern Alaska, occur beyond tree line in riparian shrub thickets (Banfield 1974, Bee and Hall 1956, Wolff and Zasada 1975). Typically avoid clearcuts (Bakker and Van Vuren 2004).
Bakker, V. J. and D. H. Van Vuren. 2004. Gap-crossing decisions by the red squirrel, a forest-dependent small mammal. Conservation Biology 18:689-697.
Banfield, A. W. F. 1974. The mammals of Canada. University of Toronto Press, Toronto, Canada. 438 pp.
Bee, J.W. and E.R. Hall. 1956. Mammals of northern Alaska on the Arctic Slope. Univ. Kansas Mus. Nat. Hist. Misc. Publ. No. 8. 309 p.
Wolff, J. O. and J. C. Zasada. 1975. Red squirrel response to clearcut and shelterwood systems in Interior Alaska. USDA, USFS Research Note, PNW-255.