How to Identify the Common Garter Snake (Identification Guide)
Learn to recognize the Common Garter Snake by its characteristic three light longitudinal stripes on a dark background and slender, keeled-scale body.
Read the full Common Garter Snake encyclopedia entry →
Key identifying features
The Common Garter Snake is one of the most widespread and variable snakes in North America, but nearly all individuals share a basic pattern: three light stripes running the length of a darker body—one along the middle of the back and one on each side. This striping is the single most useful identification feature, though the exact colors and boldness vary considerably by region and subspecies.
Coloration & pattern
Background color ranges from black, brown, or olive to gray, with the three stripes appearing in shades of yellow, greenish-yellow, white, orange, or blue depending on the population. Between the stripes, the body often shows a checkered or spotted pattern of darker blotches, which can be quite bold in some individuals and nearly absent in others. The belly is typically pale yellow, green, or gray, sometimes with faint dark markings along the edges.
Head, eyes & scales
The head is only slightly wider than the neck and is usually a darker shade than the body, sometimes with a reddish or olive tint. Eyes are moderately large with round pupils. The dorsal scales are keeled, giving the snake a somewhat rough, matte texture rather than a glossy sheen. A light-colored spot is often visible on top of the head or just behind it in many populations.
Size & body shape
Adults commonly range from 18 to 26 inches (46 to 66 cm), with some individuals reaching over 3 feet. The body is slender to moderately stout, with females generally growing larger and heavier than males. The tail is proportionally long and tapers gradually.
Range & habitat where you'll see it
This species is extremely widespread across most of the United States and southern Canada, occupying an enormous range of habitats including meadows, woodlands, marshes, gardens, and suburban yards, almost always near some source of moisture. It is frequently the most commonly encountered snake in urban and suburban settings within its range.
How to tell it apart from look-alikes
Ribbon snakes are very similar but tend to be more slender, have proportionally longer tails, and often show a more distinct, unspotted appearance between the stripes with a plain-colored area in front of the eye. Plains garter snakes typically have a bright orange or yellow mid-dorsal stripe and a more restricted side-stripe placement on lower scale rows. Water snakes, which are sometimes confused with garter snakes, lack the three-stripe pattern entirely and instead show banding or blotching, and have a stockier build with a more triangular-shaped head.
Frequently asked questions
What is the main pattern to look for on a Common Garter Snake?
Three light-colored longitudinal stripes—one down the center of the back and one on each side—running against a darker background color.
Do all Common Garter Snakes look the same color?
No, coloration varies widely by region; stripes can be yellow, white, orange, or blue, and the background can be black, brown, olive, or gray.
How can I tell a Common Garter Snake from a ribbon snake?
Garter snakes are generally stockier with a shorter tail relative to body length and often show checkered spotting between the stripes, while ribbon snakes are more slender, longer-tailed, and plainer between the stripes.
What kind of scales does the Common Garter Snake have?
Its dorsal scales are keeled, giving the body a slightly rough, non-glossy texture rather than smooth, shiny scales.
Where is the Common Garter Snake most likely to be seen?
It is extremely widespread across the U.S. and southern Canada and is commonly found near water, in gardens, meadows, and suburban yards.