How to Identify the Short-headed Garter Snake (Identification Guide)

Key identifying features

The Short-headed Garter Snake (Thamnophis brachystoma) is a small garter snake recognized by its notably short, blunt head and its limited, patchy distribution centered in the Allegheny Plateau region of the northeastern-to-mid United States.

Coloration & pattern

The back is typically brown, gray-brown, or olive-brown, without the strong checkered spotting seen in some other garter snakes. A central stripe is usually present and pale yellow, tan, or orange-tinged, while faint lateral stripes may appear along the lower sides. The overall look tends to be relatively plain and subdued compared to more boldly patterned garter snakes. The belly is generally pale cream to greenish-yellow.

Head, eyes & scales

As the name suggests, the head is notably short and blunt relative to body size, only modestly wider than the neck. Eyes are moderate with round pupils. Scales are keeled, typically 19 rows at midbody.

Size & body shape

This is one of the smaller garter snake species, with adults usually reaching only 15 to 27 inches (38-69 cm). The body is slender, and the tail relatively short in proportion to overall length, consistent with the compact head shape.

Range & habitat where you'll see it

The Short-headed Garter Snake occupies a fairly restricted range centered on the Allegheny Plateau, including parts of Pennsylvania, New York, and Ohio. It favors moist grassy fields, meadow edges, and open areas near woodlands, generally avoiding deep forest or strongly aquatic habitats.

How to tell it apart from look-alikes

Its unusually short, blunt head and smaller overall size help separate it from the more widespread Common Garter Snake, which typically has a proportionately longer head and often grows larger. The relatively plain body pattern, lacking heavy checkering, also distinguishes it from more boldly marked garter snake species. Its restricted Allegheny Plateau range further narrows identification when the subtle head-shape difference is hard to judge.