Reptiles Active during the day

Common Garter Snake

Thamnophis sirtalis

iNaturalist Wikipedia

The Common Garter Snake is North America's most familiar backyard reptile, recognizable by its racing stripes and gentle nature. A master of adaptation, it is as comfortable in a suburban flowerbed as it is in a wild mountain meadow.

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0 Habitats

Quick Identification

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Size

Average length of 46–66 cm (18–26 in), reaching a maximum of 137 cm (54 in); typical weight is approximately 150 g (5.3 oz).

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Colors

Variable background of black, brown, or olive-green with three distinctive yellow, white, or light green longitudinal stripes. Some individuals exhibit red or orange spotting between the stripes.

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Key Features

Three prominent longitudinal yellow or cream stripes
Large, visible scales with a keeled (ridged) texture
Head is slightly wider than the neck with large eyes and round pupils
Labial (lip) scales are often barred with black

When You’ll See Them

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Activity pattern Active during the day

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Peak hours 9 AM - 5 PM

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Season April-October

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Diet A generalist predator that consumes earthworms, slugs, frogs, toads, tadpoles, small fish, and occasionally leeches or small rodents. They hunt using a combination of sight and their highly developed sense of smell, flicking their tongues to 'taste' the air.

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Habitat Highly versatile; commonly found in suburban gardens, damp meadows, forest edges, marshes, and near the banks of streams or ponds.

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Where Does the Common Garter Snake Live?

Native to the North American continent, the Common Garter Snake has one of the most expansive distributions of any reptile in the region. It is found throughout the United States and most of southern Canada, ranging from the Atlantic coast to the Pacific Northwest. This hardy species even extends its reach into parts of Northern Mexico, thriving in diverse environments from humid coastal plains to high mountain meadows.

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3 Countries

10.5M km² Range

Least Concern Conservation

US United States CA Canada MX Mexico

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iNaturalist / Verified observation data

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Behavior

The Common Garter Snake is one of the most social and adaptable reptiles in North America. Primarily diurnal, these snakes spend their mornings basking on rocks, logs, or pavement to absorb heat before beginning their hunt. They are well-known for their winter brumation, where hundreds or even thousands may gather in underground dens called hibernacula to survive freezing temperatures, emerging en masse in a spectacular display during early spring.

While they are generally shy and will flee into vegetation or water when approached, they have a few unique defense mechanisms. If caught, they may release a foul-smelling musk from their cloaca or flatten their bodies to appear larger. Despite being technically mildly venomous (their saliva is toxic to small amphibians and fish), they are harmless to humans and rarely bite unless significantly provoked.

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Camera Tips

Capturing the Common Garter Snake on a backyard camera requires a 'ground-level' strategy. Mount your camera no more than 2 to 4 inches off the ground, aiming the lens along natural 'corridors' like the edge of a garden bed, a stone wall, or a fallen log. These snakes prefer to travel along edges where they feel protected while remaining close to basking spots. A horizontal angle is essential to capture the full length and distinctive striping of the snake.

Because snakes are ectothermic and lack the high body heat of mammals, standard PIR motion sensors can struggle to detect them. To solve this, set your camera to 'Time-Lapse' mode during the warmest hours of the day (10 AM to 3 PM) with an interval of 30 seconds to 1 minute. Alternatively, look for cameras with highly sensitive triggers or 'All-Motion' settings that detect pixel changes rather than just heat signatures.

To create a hotspot for filming, place a large, flat, dark-colored rock in a sun-drenched area and aim your camera there. This basking site will naturally attract snakes looking to warm up. You can also improve your chances by providing a small water feature or leaving a patch of tall, native grass nearby, which serves as a hunting ground for the earthworms and frogs that garter snakes love to eat. High-resolution video settings (1080p or higher) are recommended to capture the rapid flicking of the tongue, which is one of the most charismatic behaviors to see on film.

Similar Species

Species that look similar or are commonly confused with Common Garter Snake.

Western Ribbon Snake

Much more slender with a longer tail and a distinct white spot in front of each eye.

DeKay's Brownsnake

Smaller and lacks the long, bright longitudinal stripes, instead featuring a light brown stripe bordered by small black spots.

Plains Garter Snake

Has a more vivid orange dorsal stripe and black bars on the labial scales are much more pronounced.

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Frequently Asked Questions

They are primarily diurnal, meaning they are active during the day. You are most likely to see them mid-morning when they are basking in the sun to warm up, and again in the late afternoon when they are hunting for food.

Create a 'snake-friendly' environment by providing cover like rock piles, logs, or tall grass. Avoid using pesticides, as these kill their food sources like slugs and worms. A small garden pond or water feature is also a huge draw for them.

Their diet is very diverse, consisting mainly of earthworms, slugs, and amphibians like frogs and toads. They are excellent at controlling garden pests that might otherwise eat your vegetables.

Yes, they are exceptionally well-adapted to suburban living. They frequently live in gardens, under porches, and in parks, often going unnoticed due to their camouflaged patterns and secretive nature.

While similar, Ribbon Snakes are much thinner and have their side stripes on the third and fourth scale rows (counting up from the belly), whereas Common Garter Snakes have stripes on the second and third rows. Ribbon Snakes also typically have a clean white spot in front of the eye.

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