An active, diurnal, semi-aquatic North American colubrid that is one of the few pet snakes comfortable being kept in small groups. Its small size and lively daytime behavior make it a great, engaging beginner species.
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Small-to-medium; adults usually 18-36 in (45-90 cm), slender and active.
Lifespan
6–10 years
Social needs
group
Native region
North America (United States and Canada)
Origin
New World
Climate
🍂 Temperate
Family
Colubridae
Genus
Thamnophis
Part of the Colubrid snakes
Colubrids are the largest and most diverse snake family, encompassing most popular non-constricting and mildly constricting pet snakes. They range from hardy beginner species to specialized insectivores, and are generally non-venomous and manageable in captivity.
From the minimum an animal needs to be kept humanely, up to the ideal setup. Bigger is almost always better — minimums are floors, not targets.
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Minimum
Adult enclosure
3 × 1.5 × 1 ft (≈ 30 gal)
Common garter snakes reach 2–3 ft. Minimum is a 3×1.5×1 with a warm hide, cool hide, large water bowl (often soaks), and a basking spot of 28 °C. Tolerate cool ambient.
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Recommended
Front-opening vivarium
4 × 2 × 1.5 ft
A 4×2 with low branches, multiple hides, dig substrate, and a large soaking pool. Garters are diurnal active foragers and use vertical space lightly. Low UVB (5%) supports natural cycles.
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Ideal
Bioactive semi-aquatic
4 × 2 × 2 ft, bioactive
Bioactive temperate enclosure with deep substrate, larger water feature, leaf litter, and live plants. Garters thrive in enriched setups with foraging opportunities.
Life & growth stages
How this animal changes through its life — each stage often has its own care, diet and space needs.
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Egg / Neonate
Most reptiles lay leathery- or hard-shelled eggs incubated by ambient warmth, though some snakes and lizards give live birth. Incubation temperature can influence sex and development in many species.
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Hatchling
Hatchlings emerge as fully formed miniatures of the adult, often using an egg tooth to slit the shell. They are independent from birth but small and vulnerable, and may show brighter or different juvenile patterning.
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Juvenile
Juveniles grow steadily, shedding their skin periodically as they enlarge. Coloration and proportions shift toward the adult form, and growth rate depends heavily on temperature, diet, and basking/UVB access.
Adult
Adults reach the species' full length and mass and become sexually mature. Many reptiles show sex differences in size, coloration, or features (such as larger heads, hemipenal bulges, or femoral pores), and continue to shed throughout life.
Color & pattern variants
Natural variants occur in the wild; selectively bred (man-made) variants were developed in captivity.
A single adult does well in a 20-gallon long enclosure; a small group needs more, ideally 40 gallons or larger. Unlike most pet snakes, garters are active and diurnal, so horizontal space and visible decor matter. Provide a secure lid (they are quick and inquisitive), a substrate of aspen, cypress mulch, or bioactive soil, several hides, climbing branches, and a sizeable water dish big enough to soak in, since these snakes swim and forage near water.
Maintain a basking spot of 85-90 F (29-32 C) and a cool side around 70-75 F (21-24 C), with a natural nighttime drop. Humidity of 40-60% is appropriate for this temperate, water-associated species. Because they are day-active, a UVB bulb on a 10-12 hour photoperiod is genuinely beneficial, more so than for most nocturnal snakes.
Substrate
Aspen shavings, cypress mulch, or a coco-fiber/soil mix all work well; choose a slightly moisture-retentive substrate to support humidity and provide a clean, absorbent surface that is easy to spot-clean given their frequent, watery defecation.
Equipment & setup
A 20-40 gallon terrarium with a tightly secured lid (they are escape artists) suits adults. Offer a thermal gradient with a basking spot of 85-88°F and a cool end of 70-75°F via an overhead bulb or under-tank heater on a thermostat, plus low UVB; include a large, sturdy water bowl since they swim, soak, and may defecate in it.
Diet
Garter snakes are unusual among pet snakes in eating a varied diet. Captive staples include earthworms (nightcrawlers), appropriately sized fish, and frozen-thawed pinky or fuzzy mice as the snake grows. Avoid goldfish and other thiaminase-rich fish as a staple, as they cause vitamin B1 deficiency; use safer fish like tilapia or trout occasionally and dust worms or fish with calcium/vitamins.
Feed juveniles every 4-5 days and adults every 5-7 days, given their fast metabolism. Many individuals readily take a worm-and-mouse mix; offering variety helps maintain nutrition and interest.
Behavior & temperament
Garters are curious, fast, and active during the day, making them engaging to watch as they explore, swim, and bask. They may musk or wriggle when first handled but generally tame down with gentle, regular interaction; they are not constrictors and rely on quick strikes and swallowing live prey in the wild.
They are among the few snakes that can be cohoused, though keepers should watch for size disparities and feeding competition (and separate at feeding time to avoid accidents). Provide enrichment through water features, climbing, and foraging opportunities to suit their busy temperament.
Health
Thiamine (vitamin B1) deficiency from feeding thiaminase-containing fish like goldfish is a classic, preventable garter snake problem causing tremors and neurological signs, so manage diet carefully. Internal parasites are common, especially in wild-caught animals, making a fecal check and captive-bred sourcing wise.
Respiratory infections and skin/scale issues arise from enclosures that are too damp, dirty, or cold; keep water clean and conditions balanced. Their shorter lifespan and fast metabolism mean obesity is less common, but a varied, supplemented diet and good hygiene (Salmonella precautions) remain important.
Tips, DIY & hacks
Active and diurnal, garters enjoy enrichment, climbing branches, and multiple hides. Feed a varied diet — earthworms, fish, and rodents — but avoid goldfish and raw fish high in thiaminase (which causes B1 deficiency); supplement fish-based diets carefully or pre-treat, and handle gently as stressed individuals may musk.
