They can be found in coniferous and deciduous forest, forest edge, clearings, bogs, open woodland, brushy areas adjacent to forest; in migration and winter in a variety of open woodland, brushy and grassy habitats. One of the most abundant birds of North America.
Nests in plant debris accumulations on the ground, often concealed by a log, rock, tree roots, leaves, or ground vegetation. The female will weave the nest together taking up to a week to build. The clutch size is 3 to 6 eggs, that are white, gray, pale bulusih white, or pale greenish white speckled with brown, gray, and green, but occasionally unmarked.
Junkos are seed eaters, that will occasionally eat insects.