Eastern Garter Snake (Thamnophis sirtalis) Care Sheet
A complete guide for the successful keeping of this active, diurnal, and semi-aquatic snake, known for its tolerance to cooler temperatures and unique diet.
1. Overview & Commitment
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Common Name: Garter Snake, Garden Snake
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Scientific Name: Thamnophis sirtalis spp.
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Natural Habitat: Highly adaptable, found near permanent water sources (ponds, streams) across North America. They are active, semi-aquatic, and primarily diurnal.
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Size: Small to medium, typically reaching 0.6 – 1.2 m (2 – 4 feet) in length.
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Lifespan: 10 – 20 years in captivity.
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Temperament: Extremely active, curious, and fast-moving. They may musk or strike when first handled, but usually tame quickly. They can be housed communally (females or mixed groups, provided they are fed separately).
2. Vivarium/Enclosure
Garter snakes require a habitat that is both long for active movement and provides access to water.
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Minimum Adult Enclosure (Pair/Trio): A standard 75-gallon (1.2 m / 4 ft long) enclosure or equivalent is recommended for a pair or small group, emphasizing floor space.
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Enclosure Type: Secure glass or PVC enclosure. They are excellent escape artists, so the lid must be securely clamped.
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Structure: Provide multiple horizontal climbing branches, artificial or live plants for cover, and two hides (warm and cool).
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Water Feature (Crucial): A large, sturdy water dish or shallow water basin must be provided for soaking, swimming, and drinking.
3. Substrate
The substrate must be safe, easily cleaned, and moisture-tolerant due to the water feature.
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Recommended Substrate: A layer of Cypress Mulch, Coconut Fiber (Coco Coir), or a soil/sand mix.
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Management: Keep the substrate damp around the water feature but drier on the basking side. Spot-clean immediately, as they have a fast metabolism.
4. Heating & Temperature
Garter snakes are cool-tolerant but still require a heat gradient.
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Primary Heat Source: An overhead basking lamp or Ceramic Heat Emitter (CHE) connected to a Thermostat.
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Basking Spot/Hot Spot: A surface temperature of 30°C – 32°C (86°F – 90°F) is necessary for digestion.
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Cool Side Ambient: 21°C – 24°C (70°F – 75°F).
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Night Time: Temperatures can safely drop to 18°C – 21°C (65°F – 70°F).
5. Lighting & UV
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Ambient Light: Full-spectrum LED lighting to support their diurnal nature.
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UVB (Recommended): A low-level UVB source (e.g., a 5-6% T5 tube) is highly beneficial, as they bask frequently in the wild.
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Photoperiod: Maintain a consistent 12-hour cycle.
6. Humidity & Hydration
Moderate humidity is required, achieved easily with the large water dish.
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Ambient Humidity: Generally requires a moderate level of 50% – 70%.
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Water Quality: The large water dish must be kept impeccably clean and fresh daily.
7. Diet & Feeding
Garter snakes are unique in that they primarily eat fish, worms, and amphibians in the wild.
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Staple Diet: A varied diet is key. Frozen/thawed Silversides, Tilapia fillets, or Salmon fillets (cut into strips). Live Earthworms (bait shop worms, not garden worms) are excellent.
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Supplemental: Appropriately sized frozen/thawed mice or rat pups can be offered occasionally (once every few weeks) to provide variety and fat.
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Warning (Thiaminase): Avoid feeder fish that contain high levels of thiaminase (e.g., gold fish, feeder guppies, rosy reds) as this enzyme destroys Vitamin B1 (Thiamine), leading to neurological issues. Stick to Thiaminase-free fish (Silversides, Tilapia).
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Feeding Schedule (Adult): Feed 2–3 times per week due to their fast metabolism.
8. Handling & Maintenance
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Handling: Frequent, gentle handling usually calms them down quickly. Be aware of the initial musking when young.
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Maintenance: Daily spot cleaning is required due to their fast metabolism and watery waste. Clean the water dish daily.
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Communal Housing: If housing communally, ensure each snake is fed individually (with tongs, separated if necessary) to prevent fighting or cannibalism.