The different coloration patterns are: pale gray with alternating rows of darker blotches on the sides, dark brown with borders that are less distinct, or nearly all black.

A long yellow stripe running down the back may be present or absent, only confined to the neck, or just very indistinct.

The second color morph has the more classic garter snake look; however, due to its behavior and scalation, it is grouped in this species.

It can most commonly be found on the edges of bushlands, woodlands, grasslands, and forests near ponds, marshes, streams and lakes.

Occasionally, while the snake is hunting for food in a stream, it will flick its tongue above the water to mimic an insect that a small fish would usually eat, thus luring the prey into its mouth.