Garter Snake — care sheet

Beginner–Intermediate. Hardy, active, and manageably sized — but NOT a rodent-fed ambush snake. A garter eats fish and worms, needs a varied diet to avoid a thiamine deficiency, wants water to swim in, and is a busy diurnal animal that actually needs space. Simple to keep once you understand it isn't a corn snake.

NOT a rodent snake — a fish-and-worm eater, and VARIETY is the rule. Feed a varied menu of earthworms / nightcrawlers and whole feeder fish, plus the occasional pinky mouse. Juveniles every 3–5 days, adults every 4–7 days (worm-eaters need feeding more often than fish- or mouse-eaters). Prey no more than ~1.5× the snake’s width; offer worms and fish several at a time.

Roomy for an active diurnal forager: about 48×24×24 in (120×60×60 cm) for an adult, at least 18 in tall for safe lighting and climbing terrain. Unusually for a snake, garters CAN be group-housed (it can even lower stress in juveniles) — but each extra snake needs significantly more space.

Basking area 85–90°F (29–32°C) from an overhead halogen over a flat basking rock or plank. Two bulbs make an even basking zone. Cool-side air above 91°F (33°C) is dangerous — garters overheat and can die of heat stroke.

Cool side 75–80°F (23–27°C), giving a full gradient.

Night 64–75°F (18–24°C); heat off at night. A winter cool-down to ~60–68°F by day is natural for them.

UVB is beneficial for a diurnal, day-active snake: a T5 HO bulb (Arcadia Forest 6%) giving UVI 2.0–3.0 at the basking spot. Replace every 12 months.

Average 35–60% — higher on the cool end and at night, lower on the warm end. Consistently too damp or too dry causes problems, but the big water basin (below) does most of the humidity work.

A moisture-retentive, burrowable mix (aspen is too dry-only; a topsoil/coco blend or a bioactive mix suits them) that holds a little humidity. Add cover, plants, and climbing terrain for a busy, exploring snake.

Vary the diet to prevent a vitamin B1 (thiamine) deficiency — some fish (notably goldfish and rosy-reds) contain thiaminase, which destroys thiamine, so never feed those as a staple. Lightly dust worm/fish meals with a calcium/multivitamin to round out a diet that’s less complete than whole rodents.

18–54 in (45–137 cm) depending on species/sex; females are larger

10 years or more with good care

See a reptile or exotics vet if you notice: Tremors, weakness, loss of coordination, or "stargazing" (possible vitamin B1 / thiamine deficiency — classically from an all-fish, thiaminase-rich diet).; Open-mouth breathing, wheezing, or mucus/bubbles (possible respiratory infection).; Repeated stuck sheds or retained eye caps; cheesy matter in the mouth (mouth rot); or mites (tiny moving dots).; Regurgitating meals, poor weight, or abnormal/worm-visible droppings (parasites — common in wild-caught garters).; A female straining and unwell around birthing, or any tissue protruding from the vent (prolapse)..