Godman's garter snake (Thamnophis godmani)
Snakes · Difficulty: Expert
Key facts and care guidance for Godman's garter snake (Thamnophis godmani) (origin: The Sierra Madre del Sur in Guerrero (Mexico), about 1770–2440 m; older records from Oaxaca, Puebla and Veracruz partly belong to species split off since). Adult size around about 45–60 cm (type specimen 61 cm, of which 15 cm tail). Life expectancy 8–10 years (estimate based on the genus). The values below are carefully researched guidance.
Short answers
Godman's garter snake: How big does the enclosure need to be?
From 75×45×30 cm (minimum size per the 1997 expert report, garter snakes; clearly more floor space for a pair).
Godman's garter snake: What temperature does it need?
Daytime 18–26 °C, basking spot Basking spot 28–32 °C, at night 12–16 °C.
Godman's garter snake: Does it need UVB lighting?
UVB: Recommended (UVB tube above the basking spot, as for all diurnal garter snakes).
Godman's garter snake: How long do they live?
Life expectancy: 8–10 years (estimate based on the genus).
Godman's garter snake: Is it suitable for beginners?
No – better suited to experienced keepers (difficulty: Expert).
Climate
- Daytime temperature
- 18–26 °C
- Night temperature
- 12–16 °C
- Basking spot
- Basking spot 28–32 °C
- Humidity
- 60–80 % (cloud and pine-oak forest; still well ventilated)
- UVB
- Recommended (UVB tube above the basking spot, as for all diurnal garter snakes)
Enclosure
- Minimum size
- from 75×45×30 cm (minimum size per the 1997 expert report, garter snakes; clearly more floor space for a pair)
- Substrate
- Forest floor of soil and coco humus with leaf litter and moss, cool side moist, flat rocks and pieces of wood as hides, a water bowl
Feeding
- Food
- Earthworms, low-thiaminase fish (with vitamin B1), thawed pinkie mice; what the species eats in the wild has not been studied
- Feeding interval
- adults 1×/week, juveniles more often
Key facts
- Adult size
- about 45–60 cm (type specimen 61 cm, of which 15 cm tail)
- Life expectancy
- 8–10 years (estimate based on the genus)
- Origin
- The Sierra Madre del Sur in Guerrero (Mexico), about 1770–2440 m; older records from Oaxaca, Puebla and Veracruz partly belong to species split off since
- Protection status
- Not listed under CITES
- Brumation
- Short rest period of 6–8 weeks at 12–16 °C with a few hours of basking per day (derived from the montane climate; a cold winter rest is not needed)
- Cohabitation
- In pairs or singly, with roughly equal-sized animals: in the related longtail alpine garter snake, large females have eaten smaller cage mates, and experience with this species is lacking. Always feed singly, ideally in separate boxes.
Notes
Hardly any captive experience; the values are derived from the habitat and from close relatives. A montane forest species: copes poorly with heat and needs a cool, moist side.
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Related species
- Ahumada's alpine garter snake (Thamnophis ahumadai) – Expert
- Bogert's garter snake (Thamnophis bogerti) – Expert
- Butler's garter snake (Thamnophis butleri) – Intermediate
- Cope's mountain meadow snake (Thamnophis copei) – Expert
- Fox's mountain meadow snake (Thamnophis foxi) – Expert
- Yellow-throated garter snake (Thamnophis pulchrilatus) – Expert
- Common garter snake (Thamnophis sirtalis) – Beginner
- Goldenhead garter snake (Thamnophis chrysocephalus) – Expert
What you need to start
To keep Godman's garter snake (Thamnophis godmani) you typically need: a suitable enclosure (from 75×45×30 cm (minimum size per the 1997 expert report, garter snakes; clearly more floor space for a pair)), substrate (Forest floor of soil and coco humus with leaf litter and moss, cool side moist, flat rocks and pieces of wood as hides, a water bowl), a heat source with a thermostat, UVB lighting, 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: 27 October 2026 · Editor: Reptoria editorial team · Sources include: Wikipedia FR: Thamnophis godmani – Holotypus 610 mm, davon 150 mm Schwanz – https://fr.wikipedia.org/wiki/Thamnophis_godmani, S. Bol: Observations … Thamnophis scalaris – Kannibalismus bei einer verwandten Hochlandart – https://stevenbolgartersnakes.com/publications-2/observations-in-the-wild-and-in-captivity-on-the-mexican-alpine-blotched-garter-snake-thamnophis-scalaris-cope-1861a/, ReptiFiles Garter Snake Care Sheet – Futter und Fütterung der Gattung – https://reptifiles.com/garter-snake-care-sheet, Reptile Database: Thamnophis godmani – ovovivipar – https://reptile-database.reptarium.cz/species?genus=Thamnophis&species=godmani, Grünwald et al. 2024, Herpetozoa 37 – T. godmani-Komplex, Bergwälder 1768–3048 m, Schwanzanteil 25–29 % – https://herpetozoa.pensoft.net/article_preview.php?id=122213
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).