Green rat snake (Senticolis triaspis)
Snakes · Difficulty: Intermediate
Key facts and care guidance for Green rat snake (Senticolis triaspis) (origin: Arizona to Costa Rica – montane forest). Adult size around 100–150 cm. Life expectancy 15–20 years. The values below are carefully researched guidance.
Short answers
Green rat snake: How big does the enclosure need to be?
120×60×80 cm.
Green rat snake: What temperature does it need?
Daytime 25–31 °C, basking spot 33 °C, at night 18–22 °C.
Green rat snake: Does it need UVB lighting?
UVB: Not required.
Green rat snake: How long do they live?
Life expectancy: 15–20 years.
Green rat snake: Is it suitable for beginners?
Rather not – it is considered an intermediate species (difficulty: Intermediate).
Climate
- Daytime temperature
- 25–31 °C
- Night temperature
- 18–22 °C
- Basking spot
- 33 °C
- Humidity
- 55–70 %
- UVB
- Not required
Enclosure
- Minimum size
- 120×60×80 cm
- Substrate
- Bark mulch with leaf litter, a cork hide, climbing branches, a water dish
Feeding
- Food
- Frozen-thawed mice of a suitable size
- Feeding interval
- 1×/week
Key facts
- Adult size
- 100–150 cm
- Life expectancy
- 15–20 years
- Origin
- Arizona to Costa Rica – montane forest
- Protection status
- Not listed under CITES
- Brumation
- A cooler spell of 8–10 weeks
- Cohabitation
- Keep them singly. Snakes are solitary and do not seek company — a shared hide is competition for the best spot, not social behaviour. The concrete reason is the feeding accident: if two animals grab the same food item, one can swallow the other along with it. On top of that, once they are kept together you can no longer tell which animal has eaten and which is losing weight. For breeding, put them together under supervision and separate them again afterwards.
Notes
Adults are a plain greenish grey, the young boldly spotted. Slender, very climbing-keen, active by day and at dusk. Rare in Europe – ask specifically for captive-bred animals.
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Related species
- Russian rat snake (Elaphe schrenckii) – Beginner
- Aesculapian snake (Zamenis longissimus) – Intermediate
- Baird's rat snake (Pantherophis bairdi) – Beginner
- Red bamboo rat snake (Oreocryptophis porphyraceus) – Intermediate
- Twin-spotted ratsnake (Elaphe bimaculata) – Beginner
- Western fox snake (Pantherophis vulpinus) – Beginner
- Rhinoceros rat snake (Gonyosoma boulengeri) – Intermediate
- Green bush rat snake (Gonyosoma prasinum) – Expert
What you need to start
To keep Green rat snake (Senticolis triaspis) you typically need: a suitable enclosure (120×60×80 cm), substrate (Bark mulch with leaf litter, a cork hide, climbing branches, a water dish), a heat source with a thermostat, thermometer and hygrometer, a water dish and hides. You will find equipment in the Reptoria marketplace.
The complete, interactive care database is in the Reptoria app.
Last updated: 5 November 2026 · Editor: Reptoria editorial team · Sources include: https://en.wikipedia.org/wiki/Senticolis_triaspis, https://reptile-database.reptarium.cz/species?genus=Senticolis&species=triaspis, https://www.snakeestate.com/rat-snakes/green-rat-snake/, Arizona Game and Fish Dept., HDMS-Abstract Senticolis triaspis (diurnal and crepuscular, im Sommer auch nachts; Murphy 2018); reptilesofaz.org (primarily diurnal and crepuscular); Tucson Herpetological Society (meist morgens und spätnachmittags)
All values are non-binding guidance and do not replace expert advice. Research thoroughly from several sources before acquiring and keeping an animal, and observe the applicable law (species and animal protection in particular).