How to Identify the Checkered Garter Snake (Identification Guide)
Spot the Checkered Garter Snake by its bold black-and-tan checkerboard pattern, prominent mid-dorsal stripe, and slender southwestern build.
Read the full Checkered Garter Snake encyclopedia entry →
Key identifying features
The Checkered Garter Snake is a slender, strikingly patterned snake of the southwestern United States and Mexico, named for the distinctive checkerboard-like arrangement of dark blotches along its back and sides. This bold, regular checkering, combined with a pale central stripe, makes it one of the more visually distinctive garter snake species.
Coloration & pattern
The base color is typically light olive, tan, or grayish-brown, overlaid with two alternating rows of squarish black or dark brown blotches on each side that create a clear checkerboard effect. A pale yellow, cream, or greenish mid-dorsal stripe runs down the center of the back, often bordered closely by the checkered blotches, which can make the stripe appear narrow or interrupted in some individuals. The belly is typically pale cream or yellowish, occasionally with light spotting.
Head, eyes & scales
The head is narrow, only slightly wider than the neck, and usually shows dark markings continuing from the body pattern onto the top of the head. Eyes are moderate in size with round pupils. Scales are keeled, giving the body a rough surface texture.
Size & body shape
Adults typically range from 18 to 28 inches (46 to 71 cm), with a slender, elongated body typical of many garter snake species. The tail is moderately long, contributing to an overall lean appearance well suited to its active, fast-moving lifestyle.
Range & habitat where you'll see it
This species ranges through the southwestern United States, including Texas, New Mexico, and Arizona, south through much of Mexico. It favors areas near permanent or semi-permanent water sources, including irrigation ditches, ponds, streams, and marshy edges in arid and semi-arid landscapes.
How to tell it apart from look-alikes
The checkerboard pattern of alternating dark blotches is the primary feature separating this species from other garter snakes in its range, most of which show more uniform striping or less regular blotching. Compared to the Plains Garter Snake, the Checkered Garter Snake's blotches are more distinctly squared and arranged in a tighter, more obvious checkerboard grid rather than a looser mottled pattern. Its overall slenderness and the crispness of its pattern edges also help distinguish it from bulkier water snakes, which lack any central light stripe and instead show irregular crossbanding.
Frequently asked questions
What gives the Checkered Garter Snake its name?
The regular, checkerboard-like pattern formed by two rows of squarish dark blotches along each side of its body.
Does the Checkered Garter Snake have a central stripe?
Yes, a pale yellow, cream, or greenish mid-dorsal stripe runs down the back, though it can appear narrow where bordered closely by the dark blotches.
How can I tell it apart from the Plains Garter Snake?
Its blotches are more distinctly squared and arranged in a tighter checkerboard grid, whereas the Plains Garter Snake shows a looser, less regular pattern.
Where does the Checkered Garter Snake live?
The southwestern United States and much of Mexico, typically near ponds, irrigation ditches, streams, and other water sources in arid regions.
What is the body shape of this species?
Slender and elongated, with a moderately long tail, typical of an active, fast-moving garter snake.
Checkered Garter Snake identified by the community
Recent Checkered Garter Snake specimens identified with Snake Identifier.
