Dashing and darting about, flashing its bright white underparts, the Violet-green Swallow is one of the characteristic birds of summer. Unlike the Tree Swallow it commonly nests in niches and cavities on urban buildings and readily uses nesting boxes in residential areas. Its soft twittery call notes are a familiar pre-dawn sound as they fly about overhead.
The Violet-green swallow is a very early spring migrant concentrating about streams and wetlands where emerging insects can be found until warmer weather allows them to move into more upland areas. It is a common to abundant summer resident and breeding species throughout most of Oregon, though uncommon in the Klamath Basin.