Northwestern Garter Snake

Thamnophis ordinoides

The northwestern garter snake (Thamnophis ordinoides) is a small to medium-sized snake native to the Pacific Northwest region of North America, including parts of British Columbia, Washington, Oregon, and northern California. This slender serpent can reach lengths of approximately 18 to 38 inches (46 to 97 cm). Its coloration is highly variable, ranging from shades of brown, gray, or black, often accentuated with vivid longitudinal stripes of yellow, orange, red, or even blue, depending on its locality. The patterns and colors help it blend seamlessly into its natural habitat, which typically includes moist environments like grasslands, forests, and near streams and wetlands.

The northwestern garter snake is primarily terrestrial and is known for its adaptability to different habitats, including suburban areas, where it can be found in gardens and parks. It is a diurnal hunter, feeding predominantly on a diet of slugs, earthworms, amphibians, and small fish. Like other members of the Thamnophis genus, it exhibits a mild temperament and poses no threat to humans, as it is non-venomous.

During the colder months, these snakes enter a state of brumation, often seeking refuge in communal hibernacula. The northwestern garter snake plays an essential role in controlling pest populations and is a critical member of the ecosystems it inhabits. Its breeding season occurs in spring, with live births of 5 to 20 young occurring in late summer, as is typical for viviparous snakes. This species' adaptability to diverse environments makes it a fascinating subject of study for herpetologists and nature enthusiasts alike.