Present all year in many parts of range, but birds from northern interior move south to southern United States or extreme northern Mexico in winter. All Seasons ...

Cornell's animated migration map shows that there is some movement starting in late August, mostly birds retreating from northern BC and Alberta.

Permanent residents of the southern half of their range, northern populations of the song sparrow migrate to the southern United States or Mexico during winter ...

Most Song Sparrow populations are migratory and face the typical gamut of human-caused threats as they travel, including collisions, particularly with glass; ...

Despite the large differences in size and coloration across the Song Sparrow's range, genetic divergence is low. High rates of immigration and emigration may ...

Proportion of birds migrating increased with breeding latitude. Individuals breeding at higher latitudes migrate farther than those breeding at lower latitudes.

In the northern part of their range, Song Sparrows are partially or completely migratory depending on snow cover and winter temperatures. This is due to their ...

Song sparrows can raise multiple broods in a single season. By October, most song sparrows have migrated south to spend winter in warmer climes.

The species is present in most of their range year-round, although northern populations migrate to the southern United States and Mexico for the winter.