According to the reports of both Mr. MacFarlane and Mr. Kennicott, the nest of this species was found both on the ground and in trees. In one instance it was in a tree about eight feet from the ground, and in its structure was said to be similar to the nests of _Turdus aliciæ_. They were nearly all found after the middle of June, a few as early as the 7th. One was found on the ground at the foot of a tuft of dwarf willows, which helped to conceal it from view. This was composed of coarse hay, lined with some of a finer quality, a few deer-hairs, and a small quantity of fresh and growing moss, intermingled together. In speaking of this nest Mr. MacFarlane states that all the nests of this Sparrow he had previously met with had been built in the midst of branches of pine or spruce trees, and had been similar to those of the _T. aliciæ_, which, in this instance, it did not resemble. He adds that this species, though not numerous, extended quite to the borders of the wooded country, to the north and northwest of Fort Anderson. Afterwards he observed several other nests on the ground, all of which were similar to the last, and it is by no means impossible that in certain instances these birds may have occupied old nests of the _T. aliciæ_, and used them for purposes of incubation. Richardson states that its nests are constructed in a low bush, and are made of dry grass, hair, and feathers. He states that the eggs are five in number, of a pale mountain-green tint, and marbled with irregular spots of brown.
Mr. Audubon, who found several of the nests of this bird in Labrador, near the coast, describes them as large for the size of the bird, and as usually placed on the ground among moss or tall grass near the stem of a creeping fir, the branches of which usually conceal it from view. Its exterior is loosely formed of dry grasses and moss, with a carefully disposed inner layer of fine grasses, circularly arranged. The lining consists of very delicate fibrous roots, with feathers of different kinds of water-fowl. In one instance he noted the down of the eider-duck. He found their eggs from the middle of June to the 5th of July. When their nest was approached, the female affected lameness, and employed all the usual arts to decoy the intruder away. They raised but one brood in a season, and about the first of September left Labrador for the south in small flocks, made up of members of one family.