Our population does not migrate, though they do flock up and move to lower elevations in the winter. Generally, a pair of bluebirds that nests successfully will return to the same area to nest in subsequent years. Even if one of the pair dies during the winter, the other bird may return with a new mate. Also, the male offspring will also tend to return to the area in which they hatched, bringing their own mates. The female offspring generally disperse over the winter and, if they find a mate, follow him to his natal site.
Bluebirds generally mate the year after they hatch.
Often they are less than one year old. It's a good thing they get started early as bluebirds do not live very long. You can put up nest boxes for bluebirds anytime. However, the best time is in the fall or winter. Bluebirds prefer a weathered box over a brand new one, and they begin checking out boxes as early as February or March.