How to Identify the Northern Pacific Rattlesnake (Identification Guide)
The Northern Pacific Rattlesnake is identified by its grayish-brown to olive body with dark blotches and banded tail, found across northern California, Oregon, Washington, Idaho, and Nevada.
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Key identifying features
The Northern Pacific Rattlesnake (Crotalus oreganus oreganus) is a medium to large rattlesnake found across much of the Pacific Northwest and interior western states, marked by a series of dark brown or blackish blotches along a gray, olive, or brownish body, with a rattle-tipped tail showing distinct black-and-white banding, similar to its close southern relative.
Coloration & pattern
Base coloration ranges from light gray to olive-brown or yellowish-brown, occasionally with a slight greenish tint. Along the back runs a series of large, dark brown to black blotches, roughly hexagonal or diamond-shaped near the front of the body, that often become more band-like toward the tail. The blotches are usually edged with a lighter border, and pattern intensity can vary noticeably between individuals and populations.
Head, eyes & scales
The head is broad and triangular, distinct from the neck, with vertical pupils and heat-sensing pits between eye and nostril. A light stripe often extends diagonally from behind the eye toward the corner of the jaw. Scales are keeled.
Size & body shape
Adults typically measure 24 to 48 inches, with large individuals reaching over 5 feet in some populations. The body is heavy-bodied and muscular, tapering to a tail with alternating black and white or gray rings preceding the segmented rattle.
Range & habitat where you'll see it
This subspecies ranges from northern California through Oregon, Washington, Idaho, and into western Nevada and parts of Utah and British Columbia. It occupies a broad range of habitats including grassland, sagebrush steppe, oak woodland, rocky outcrops, and forest edges, often at higher elevations and more northerly latitudes than many other rattlesnake species.
How to tell it apart from look-alikes
The Southern Pacific Rattlesnake is closely related and nearly identical in general appearance, distinguished mainly by geographic range rather than any single definitive visual trait, with the Northern Pacific occurring farther north and at times higher elevations. The Great Basin Rattlesnake, found in overlapping interior range, tends to show a paler, more washed-out background color suited to arid basin habitats. Because these related forms overlap closely in appearance, general blotched gray-brown patterning combined with known geographic locality is often the most practical way to identify the Northern Pacific Rattlesnake.
Frequently asked questions
What does the Northern Pacific Rattlesnake look like?
It has a gray, olive, or brownish body with dark, hexagonal to diamond-shaped blotches along the back and banded tail markings near the rattle.
How can you tell the Northern Pacific Rattlesnake apart from the Southern Pacific Rattlesnake?
The two are closely related subspecies with very similar appearance; they are best distinguished by geographic range, with the Northern Pacific found farther north.
How large does the Northern Pacific Rattlesnake get?
Adults typically range from 24 to 48 inches, with some large individuals exceeding 5 feet.
Where is the Northern Pacific Rattlesnake found?
It ranges from northern California through Oregon, Washington, Idaho, western Nevada, and into parts of Utah and British Columbia.
What habitats does the Northern Pacific Rattlesnake prefer?
It occupies grassland, sagebrush steppe, oak woodland, and rocky outcrops, often at higher elevations than many other rattlesnake species.
Northern Pacific Rattlesnake identified by the community
Recent Northern Pacific Rattlesnake specimens identified with Snake Identifier.
