Bryan McAllister’s personal reference notebook
July 28, 2026Short & citedBlog
Civic Viewpoint.
A quiet encyclopedia with a personal desk
Kept by Bryan McAllister — short guides, clear facts, and the Canadian angle when it matters.
Field Notes • Reptile

Garter Snake

Garter snakes are a group of small to medium-sized, nonvenomous North American snakes in the genus *Thamnophis*.

Updated July 28, 20261 min readCited sources

Garter snakes are small, nonvenomous snakes found across North America. They are known for their striped bodies and harmless nature.

What it is

Garter snakes belong to the genus *Thamnophis* and are recognized by one or three light longitudinal stripes running along a darker body. They are slender, typically 20–30 inches long, and come in many species and subspecies across North and Central America.

Where it lives and what it eats

These snakes are highly adaptable, living in meadows, forests, grasslands, gardens, and near water. They are carnivores that swallow prey whole, including earthworms, amphibians, fish, slugs, and insects. In the wild, they typically live 4–10 years.

Relationship with humans

Garter snakes are frequently spotted in yards and gardens and are generally harmless to people. They may bite if handled, but their bite is not dangerous. In Canada, they occur in all provinces and are a familiar part of local wildlife.

In short

  • Small, nonvenomous snakes with longitudinal stripes.
  • Carnivorous diet: earthworms, amphibians, fish, insects.
  • Common across North America, including all Canadian provinces.
  • Generally harmless to humans; often found in gardens.
Canadian angle

Garter snakes occur in all Canadian provinces and are familiar wildlife in many parts of Canada, including gardens, wetlands, and grasslands.

Quick questions

Are garter snakes poisonous?
Garter snakes are generally considered nonvenomous to humans. They are not dangerous poisonous snakes.
What do garter snakes eat?
Their diet includes earthworms, amphibians, fish, slugs, snails, insects, and other small animals.
What is the difference between a garter snake and a garden snake?
There is usually no difference; 'garden snake' is a common alternate name for a garter snake.

Sources

  1. U.S. National Park Service — https://www.nps.gov/articles/000/garter-snake-fast-facts.htm
    Supports: General facts on appearance, habitat, and diet.
  2. Encyclopaedia Britannica — https://www.britannica.com/animal/garter-snake
    Supports: Genus classification, general size, and nonvenomous status.
  3. Live Science — https://www.livescience.com/44072-garter-snake.html
    Supports: Habitat, size range, and diet overview.
  4. Connecticut Department of Energy and Environmental Protection — https://portal.ct.gov/DEEP/Wildlife/Fact-Sheets/Common-Gartersnake
    Supports: Description, range, and lifespan information.
  5. U.S. National Park Service — https://www.nps.gov/articles/000/common-garter-snake.htm
    Supports: Average lifespan in the wild and captivity.
  6. WorldAtlas — https://www.worldatlas.com/articles/garter-snake-facts-animals-of-north-america.html
    Supports: Common alternate name 'garden snake' and general distribution.