Spinus pinus, commonly known as the Pine Siskin, is native to North America. Its geographical distribution covers much of the continent, ranging from southern Canada, across throughout the United States, and into parts of northern Mexico. During the breeding season, they are found predominantly in Canada and the northern United States. In winter, their range extends further south, sometimes reaching as far as central Mexico.

Pine Siskins primarily inhabit coniferous and mixed forests, favoring areas dominated by pines, spruces, and firs. They are also found in parklands, suburban areas with suitable tree cover, and sometimes descend into lower elevations during colder months. The species thrives in cooler, temperate climates with sufficient tree cover.

Pine Siskins play a crucial role in the ecosystem as seed dispersers, feeding largely on conifer seeds, as well as buds, berries, and some insects. Their feeding habits and social nature often lead them to form flocks, which can sometimes be mixed with other finch species during migration or in winter. This social structure allows them greater efficiency in foraging and predator avoidance.