The breeding female has a dark olive-brown crown and a yellow supercilium. The black line through the eye is present and the throat and the rest of the underside is olive-green without streaking. Wing bars are absent. The Tennessee Warbler is found in Aspen and Spruce forest, particularly when the tree species are mixed. The species occurs in a wide variety of wooded areas during migration.
Food is insects.
The nest is constructed of grasses and placed on the ground, usually under a bush or in a moss clump under a tussock. The clutch consists of 4 to 7 white eggs with brown spots. This species varies considerably in abundance from year to year.