Common Garter Snake

Overview

Garter snakes are small, active, day-living snakes, and they don't constrict their prey. That makes them excellent for beginners ¹. They're known for easygoing personalities, but like any snake they may strike if ill, stressed or threatened ¹. Adults are 2 to 4 feet long depending on the species ¹², and they live 10 to 12 years or more with good care ¹². Several garter species and many color morphs are kept ².

Natural history

Garter snakes live throughout the United States and into Canada, in fields, forests, wetlands, marshes and backyards ². They are semi-aquatic: strong swimmers and agile climbers on low branches ¹². Wild garters eat small rodents, fish, earthworms and slugs ². They brumate in large groups through the winter and usually breed before leaving the den ². When startled they may vibrate the tail and, as a last resort, release a foul-smelling musk ².

Enclosure

• Size. PetMD recommends at least a 40-gallon breeder tank (36 × 18 × 16 in) for one adult and 55 gallons for a pair ¹. Chicago Exotics' minimum is 20 to 30 gallons ². We suggest the larger figure, since wider is better for these explorers ¹².
• Escape-proof. Garters are escape artists. Use a tight-fitting mesh lid ¹².
• Hides. Two hides, warm and cool ¹. Add a humid hide with damp sphagnum ¹.
• Climbing. Low branches at gentle angles; garters aren't great climbers ².
• Water and a dry area. Offer a big water bowl or small "pool" for soaking and swimming ². They must also have a fully dry area. A constantly wet garter can develop skin infections, sores and blisters ¹.

Group housing. Chicago Exotics prefers solo housing for monitoring, but two females and a male, or all females, can work ². Introduce snakes slowly on neutral ground, separate them if they fight, and never mix species ¹.

Temperature & lighting

Use an under-tank heater and/or a basking lamp on a thermostat ¹². Provide 10 to 12 hours of UV light a day, and replace bulbs every six months ¹.

Humidity

Keep humidity at 30 to 60%, toward the high end during a shed ¹². Snakes that don't shed in one piece can be soaked in shallow warm water ¹.

Substrate

Use 1 to 2 inches of paper-based bedding, coconut fiber, dry leaf litter or sphagnum moss ¹. Aspen must be replaced weekly so it doesn't stay wet and moldy ¹. Avoid pine and cedar, and skip reptile carpet, because garters push their snouts into the bedding ¹. Bark, mulch and husk can cause life-threatening blockages if swallowed, so feed in a separate container if you use them ¹.

Diet & supplementation

• Main foods. Frozen-thawed mice plus earthworms, with frozen-thawed fish as an occasional treat ¹².
• Rodent size. Start juveniles on pinkies and move up to fuzzies and hoppers as they grow ¹². Prey should be about as wide as the snake's mid-body ¹.
• Never microwave. Microwaved rodents leave hot spots that can burn a snake ¹.
• How often. Worm eaters need food at least twice a week. Mouse or fish eaters can eat about every 7 days ².
• Use tongs so your snake doesn't learn to strike at fingers ¹.

Chicago Exotics recommends pre-killed rodents, because live ones can injure snakes and live fish can carry parasites ². Cut large bait-shop nightcrawlers into pieces first ². Some garters refuse mice. Rubbing the mouse on fish or worms can help ².

Handling & temperament

Approach calmly and quietly. Snakes in shed can't see well and may mistake a hand for food, so minimize handling then ¹. Children should be supervised ¹. All reptiles can carry Salmonella, so wash your hands before and after handling the snake or anything in its enclosure ¹.

Health

Common issues

• Skin infections, sores and blisters in habitats that are too wet ¹.
• Respiratory infections ³.
• Gut blockage from swallowed bedding ¹.
• Stuck shed ¹.

When to see a vet

Call your vet for stuck shed that won't come off, noisy breathing, discharge, weight loss, mites or skin changes ⁴. Open-mouth breathing or an unresponsive snake is an emergency ⁴.

Breeding overview

Garter snakes mate in spring as they come out of brumation ². Common garters don't lay eggs. They bear live young after about two to three months, and the babies are born about 5 to 9 inches long and look like small adults ⁵.

Legal & ethics

There are many dozens of regional forms of the common garter snake ⁵. Buy captive-bred animals, and never release a pet into the wild.

Sources

1. Garter Snake Care Sheet · PetMD
2. Garter Snake Care · Chicago Exotics Animal Hospital
3. Respiratory Infections in Snakes · Tree of Life Exotic Pet Medical Center
4. When Should My Reptile See a Veterinarian? · Tree of Life Exotic Pet Medical Center
5. Thamnophis sirtalis (Common Garter Snake) · Animal Diversity Web, University of Michigan

Last reviewed 2026-10-24 by Novel Fauna. This guide is general husbandry information, not veterinary advice. When an animal is sick, see a veterinarian experienced with exotic animals.

Revision history

1. 2026-10-24 Library: 50 cited care guides, /library/[slug] route, coming-soon cards, SLUGS.txt synced to species.guide_slug 228ce54

Evidence grades: Novel Fauna editorial: source classification, not yet expert-reviewed, 2026-10-25. What the grades mean.

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