Sorbus sitchensis, commonly known as western mountain ash[1] and Sitka mountain-ash, is a small species of shrub of northwestern North America.

It forms a multi-stemmed plant, either a shrub or small tree, reaching heights of 1–4 metres (3+1⁄2–13 ft).

[3] The fruit is a berry-like pome, globular, one-quarter of an inch across, bright pinkish[4] red, and borne in cymous clusters.

It is endemic to northwestern North America, from the Pacific coast of Alaska, to the mountains of Washington, Oregon and northern California and eastward to parts of Idaho and western Alberta and Montana.

[5] It prefers moist, well-drained soils and is commonly found in mountainous regions, coastal forests, and along streambanks.