Breeding habitat is small, close-growing, young conifers in either pure stands or mixed with hardwoods. Also found in mature forests with dense understories (Hall 1994). Often associated with openings and edges where a coniferous shrub layer has developed (Phinney 1998). In the Yukon, often found in riparian and upland forests with balsam poplar, but also in areas with white spruce (Alexander et al. 2003). At higher latitudes in B.C., nests over a narrow elevational range between 570 and 810 m, but farther south in the Rocky Mountains, nests up to 1,300 m (Campbell et al. 2001).
Alexander, S. A., F. I. Doyle, C. D. Ecker, H. Grünberg, N. L. Hughes, M. Jensen, I. Johnson, D. H. Mossop, W. A. Nixon, and P. H. Sinclair. 2003. Birds of the Yukon Territory (P. H. Sinclair, W. A. Nixon, C. D. Eckert, and N. L. Hughes, eds.). UBC Press, Vancouver, B.C.
Campbell, R. W., N. K. Dawe, I. McTaggart-Cowan, J. M. Cooper, G. W. Kaiser, A. C. Stewart, and M. C. E. McNall. 2001. The Birds of British Columbia. Volume 4. Passerines: wood-warblers through Old World sparrows. University of British Columbia Press, Vancouver. 739 pages.
Hall, G. A. 1994. Magnolia Warbler (Dendroica magnolia). In The Birds of North America, No. 136 (A. Poole and F. Gill, Eds.). Philadelphia: The Academy of Natural Sciences; Washington, D.C.: The American Ornithologists’ Union.
Phinney, M. 1998. Spring and summer birds of Dawson Creek, 1991-1995. WBT Wild Bird Trust of British Columbia Wildlife Report No. 4, West Vancouver. 60 pp.