The western yellow-bellied racer (Coluber constrictor mormon),[1] also known as the western yellowbelly racer[2] or western racer,[1] is a snake subspecies endemic to the Western United States, including California, Oregon, Washington, Idaho, Nevada, New Mexico, Utah, Montana and Colorado.

It is nonvenomous[5] and is recognized by its long and very slender shape.

[6][7] It is visually similar to the eastern yellow-bellied racer, which is also green, blue or brown with a recognizable yellow underside.

Also named for its color, the western yellow-bellied racer is also gray with red or brown blotches when young.

This colubrid snake article is a stub.