Ruby-crowned Kinglet breeds from northwestern and north-central Alaska, central Yukon, northwestern and southern Mackenzie across the Prairie provinces east to Labrador and Newfoundland; south along the cordillera to southern California and across the north-central United States. Winters from southern British Columbia, Idaho, and southern Ontario south through forested mountains as far as Guatemala and Baja California.

On the coast, uncommon to locally very common during spring migration, uncommon in summer, and uncommon to common in winter in the Georgia Depression Ecoprovince; uncommon migrant and summer visitant on Western Vancouver Island, in the southern and northern Coast and Mountains Ecoprovince; rare in winter in the southern Coast and Mountains; casual in winter on Western Vancouver Island and in the northern Coast and Mountains; very rare in spring and summer and casual in autumn on the Queen Charlotte Islands.

In the interior, fairly common to very common migrant and summer visitant to the Southern Interior, Southern Interior Mountains, Central Interior, and Sub-Boreal Interior ecoprovinces, becoming uncommon in the Boreal Plains, Taiga Plains, and Northern Boreal Mountains ecoprovinces. In winter, very rare in the Southern Interior and Southern Interior Mountains.

The breeding distribution of the Ruby-crowned Kinglet is not well known, but the species probably breeds throughout its summer range in the province. The highest numbers in summer occur in the Central Interior and Sub-Boreal Interior ecoprovinces. It nests in both old-growth and advanced second-growth forests. Nests were nearly spherical, pendent structures composed primarily of mosses and plant fibres, with lichens, plant down, grass, feathers, and bark strips. Occasionally twigs, rootless, and fur were used. Most nests have been found in coniferous trees. Sizes of clutches ranged from 1 to 9 eggs, with a majority having 4 to 7 eggs.

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