How to Identify an Indigo Snake (Identification Guide)

Key identifying features

The Indigo Snake is a large, non-venomous colubrid snake native to the southeastern United States, notable for its impressive size and strikingly glossy, iridescent blue-black coloration. It has smooth scales, a relatively robust but streamlined body, and lacks the triangular head or vertical pupils of venomous pit vipers.

Coloration & pattern

The body is typically a deep, glossy blue-black to purplish-black, often with an iridescent sheen visible in sunlight, and generally lacks any blotches, bands, or spots as an adult. A distinctive feature is the reddish, orange, or cream coloration often present on the chin, throat, and sides of the face, contrasting with the dark body color. This combination of solid dark iridescent body and reddish throat is highly distinctive within its range.

Head, eyes & scales

The head is moderately broad but not sharply triangular, blending smoothly into the neck rather than showing the abrupt widening typical of pit vipers. The eyes are round with round pupils, not vertical, immediately distinguishing it from venomous pit vipers. Scales are smooth and large, contributing to the glossy appearance of the body.

Size & body shape

The Indigo Snake is one of the longest native snakes in North America, with adults commonly reaching 200 centimeters or more in total length, and exceptional individuals growing even longer. The body is thick and muscular but still relatively streamlined, giving the snake a powerful, substantial appearance distinct from more slender colubrids.

Range & habitat where you'll see it

This species is found in the southeastern United States, particularly associated with sandy upland habitats, pine flatwoods, and scrub, and is often linked to gopher tortoise burrows, which it uses for shelter. It is diurnal and often seen moving across open ground or basking, especially in cooler months.

How to tell it apart from look-alikes

The combination of large size, glossy blue-black coloration, reddish throat patch, smooth scales, and round pupils reliably distinguishes the Indigo Snake from venomous species such as cottonmouths, which have a triangular head, vertical pupils, and heat-sensing pits. It can be superficially confused with black racers or black rat snakes, but those species are typically smaller, lack the vivid iridescent sheen and reddish throat coloration, and often retain some pattern remnants, whereas the Indigo Snake's uniformly glossy dark body and greater bulk are distinctive once size and coloration are considered together.