One of thirteen juniper species native to North America, Rocky Mountain Juniper ranges from British Columbia and Alberta through the Rockies to Arizona and New Mexico, often found at elevations up to 7,500 feet on dry, rocky ground where few trees bother to compete. It grows 30 to 40 feet tall in a narrow pyramidal form, its reddish-brown bark peeling away in thin, fibrous strips, its scale-like foliage ranging from bluish-silver to dark green depending on light and exposure. In spring, small yellow-gold male flowers appear on short branchlets, and the waxy blue berry-like cones that follow are a significant food source for birds.

Full sun and a well-drained, even dry and sandy soil suit it best, and it handles drought, salt spray, erosion, and air pollution without much distress. What it cannot tolerate is prolonged wet soil, high humidity, or high nighttime temperatures, which limits its usefulness in the humid Southeast. Gardeners in the mountains of the Carolinas or in the drier western states will find it a beautiful and ecologically appropriate tree; elsewhere, the closely related Eastern Red Cedar handles the heat and humidity better. Fire is its most serious natural threat, as its thin bark and oil-rich branches offer little resistance.