Cyanocitta stelleri, commonly known as Steller's Jay, is native to western North America. Its range extends from southern Alaska through the western United States and into Central America, reaching as far south as Nicaragua. The geographical distribution includes the Pacific Coast, the Rocky Mountains, and parts of the southwestern United States.

Steller's Jay typically inhabits coniferous and mixed forest regions, often found in mountainous areas. It thrives in a variety of forested environments, including pine, fir, spruce, and deciduous woodlands. The species is well-adapted to montane forests and is frequently found at elevations from sea level up to 3,500 meters.

The ecological niche of Steller's Jay includes a role as both a predator and a seed disperser. It feeds on a diverse diet comprising insects, nuts, seeds, fruits, and occasionally smaller animals and eggs. Its adaptability to various food sources allows it to thrive in multiple forest ecosystems, contributing to seed distribution and insect population control within its habitat.