How to Identify the Prairie Rattlesnake (Identification Guide)

Key identifying features

The prairie rattlesnake shows a series of dark brown, oval-to-rounded blotches down the center of the back over a tan, greenish-gray, or pale brown base, with the blotches becoming more ring-like toward the tail. Like all rattlesnakes, the segmented rattle at the tail tip and the broad, triangular head are key identifying traits distinguishing it from non-venomous grassland snakes.

Coloration & pattern

Base coloration is typically light brown, tan, olive, or greenish-gray, providing effective camouflage against dry grassland and prairie soil. The dorsal blotches are dark brown to blackish, often bordered with a lighter edge, becoming narrower and more band-like as they approach the tail. A dark stripe typically extends diagonally from the eye to the jaw.

Head, eyes & scales

The head is broad, triangular, and clearly distinct from the neck, with heat-sensing pits between eye and nostril and vertical pupils typical of pit vipers. Scales are keeled, giving the body a matte rather than glossy texture.

Size & body shape

Adults commonly reach 3 to 4 feet in length, with a moderately stout body typical of rattlesnakes, tapering to a tail ending in a segmented rattle that grows a new segment with each shed.

Range & habitat where you'll see it

This species is widespread across the grasslands, prairies, and shrublands of the central and western United States and southern Canada, often found near rodent burrows, rocky outcrops, and prairie dog colonies, which provide both prey and shelter.

How to tell it apart from look-alikes

The muted brown blotched pattern and grassland habitat help distinguish the prairie rattlesnake from more boldly patterned or differently colored rattlesnake species found in other habitats, such as the diamond-patterned western diamondback of desert regions. Its triangular head, vertical pupils, and rattle reliably separate it from non-venomous grassland snakes such as bullsnakes, which have rounded heads and round pupils despite sometimes similar overall coloration.