Range
Breeds from central Alaska and Yukon, southwestern Mackenzie, northern British Columbia, southwestern Alberta, and Saskatchewan south through the western United States to Baja California and southern Mexico. Winters from central coastal California to southern Mexico and northern Central America.

Status in British Columbia
On the coast, common to very abundant spring migrant on southeastern Vancouver Island and the entire lower Fraser River valley in the Georgia Depression Ecoprovince. Fairly common to very common summer visitant and autumn migrant there; occasionally abundant in autumn and very rare in early winter. Uncommon to locally common migrant and summer visitant to Western Vancouver Island and the southern and northern portions of the Coast and Mountains Ecoprovince; very rare transient on the Queen Charlotte Islands.
In the interior, fairly common to very common spring migrant and summer visitant to the south-central portions of the province, including the Southern Interior and Southern Interior Mountains ecoprovinces; common to abundant autumn migrant; casual in winter there. Northward, throughout the rest of the province, uncommon to locally common migrant and summer visitant except in the extreme northeastern corner, where it is a casual spring transient in the Taiga Plains Ecoprovince.

Breeding
The Violet-green Swallow breeds throughout most of its range in the province. This species reaches its highest numbers on southeastern Vancouver Island and in the lower Fraser River valley of the Georgia Depression. It seems to thrive in close association with humans. Although the Violet-green Swallow nests solitarily, it also nests in substantial colonies, particularly on cliffs. The Violet-green Swallow has adapted well to nesting in human-made habitats such as nest boxes, the crannies of houses, garages, sheds, barns, and other buildings, and in posts and poles, stone and brick walls, and bridges. Natural nest sites include rock cliffs, snags, and cavities in living deciduous and coniferous trees. The adaptability of the Violet-green Swallow is indicated by the diversity of nest sites reported; any darkened cavity with an adequate entrance hole or crevice seems suitable. Reported nests were loosely constructed, the amount of material governed by the size of the cavity occupied. The nest was usually a collection of grasses with a small cup formed in the centre or in 1 corner of the cavity; the cup was formed with finer grasses and lined generously with feathers. White feathers seemed to be preferred. Clutch size ranged from 1 to 8 eggs, with a majority having 4 or 5 eggs.


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