Strix varia, commonly known as the Barred Owl, is native to North America. Its geographical distribution extends from the southern part of Canada, including British Columbia, through the United States, particularly east of the Rocky Mountains. The species can also be found in the Pacific Northwest and is increasingly expanding its range into the southwestern United States.

The Barred Owl typically inhabits dense forests with mature trees. It prefers mixed coniferous and deciduous forests, often near water sources such as rivers or swamps. The environmental conditions of these habitats usually include a moderate climate with sufficient cover and prey availability.

Strix varia occupies an ecological niche as a nocturnal predator. It primarily feeds on small mammals, birds, and amphibians, playing a crucial role in controlling these populations. The owl's adaptability to various forest types, including suburban areas with suitable tree cover, has allowed it to thrive in diverse ecological settings.