Snakes
Checkered garter snake care guide
Thamnophis marcianus
An active, diurnal garter that does well on a varied fish and rodent diet.
Terrestrial — floor space first
New to reptiles? Check your keeper level first →Checkered garter snake enclosure size
Terrestrial — floor space first. An adult checkered garter snake should live in at least 36" L × 18" W × 18" H; we build toward 48" L × 24" W × 24" H (4 × 2 × 2 ft, roughly 8 sq ft of floor and about a 120-gallon glass equivalent).
- Hatchling / baby
- 18" L × 12" W × 12" H recommended · min 12" L × 12" W × 12" H
- Juvenile
- 30" L × 18" W × 18" H recommended · min 24" L × 12" W × 12" H
- Adult
- 48" L × 24" W × 24" H recommended · min 36" L × 18" W × 18" H
Temperature and heating
Overhead heat (halogen, deep heat projector or radiant panel) on a thermostat, creating a warm-to-cool gradient.
- Basking / warm surface
- 88–92°F surface
- Warm side (ambient)
- 80–85°F
- Cool side (ambient)
- 70–75°F
- Night
- No lower than 65°F
Lighting and UVB
UVB: UVB recommended — garters are diurnal baskers (T5 6%). Run lights on a 12 hours on, 12 hours off photoperiod, on a timer, and replace UVB bulbs on the manufacturer's schedule even while they still emit visible light.
Humidity
Target 40–60%. Large water dish; keep the substrate dry.
Substrate and depth
Aspen or soil mix. Depth: 2–3 in.
Diet and feeding
Frozen-thawed scented mice, earthworms and thiamine-safe fish (no goldfish or feeder minnows long-term), every 3–5 days.
Enclosure tips and furnishing
- Hides on both the warm and cool sides
- Clean water available at all times
- Clutter — cork, leaf litter, plants — for cover
Build list
- Enclosure at adult size — Buy for the adult footprint to avoid repeated upgrades.
- Digital thermostat — Every heat source must run through a thermostat — unregulated heat burns animals.
- Two digital probe thermometers + hygrometer — Read the warm side, cool side and humidity directly.
Checkered garter snake FAQ
How big should an adult Checkered garter snake enclosure be?
At least 36" L × 18" W × 18" H, and we recommend building to 48" L × 24" W × 24" H — about 4 × 2 × 2 ft, or a 120-gallon glass equivalent. Terrestrial — floor space first.
What temperatures does a Checkered garter snake need?
Basking or warm surface 88–92°F surface, warm side 80–85°F, cool side 70–75°F, night No lower than 65°F. Overhead heat (halogen, deep heat projector or radiant panel) on a thermostat, creating a warm-to-cool gradient.
Does a Checkered garter snake need UVB?
UVB recommended — garters are diurnal baskers (T5 6%). Photoperiod: 12 hours on, 12 hours off.
What humidity does a Checkered garter snake need?
40–60%. Large water dish; keep the substrate dry.
What substrate is best for a Checkered garter snake?
Aspen or soil mix, at a depth of 2–3 in.
How big does a Checkered garter snake enclosure need to be for a hatchling?
Hatchling / baby: 18" L × 12" W × 12" H recommended, minimum 12" L × 12" W × 12" H. Scale up to the adult footprint as the animal grows.
Sources
Put this guide to work
Apply these targets to your own checkered garter snake record, then log feedings, sheds and weights against them.