
Source: Wikimedia Commons
Thamnophis sirtalis
A small to medium colubrid found widely across North America, with yellow stripes over a black, brown or green ground colour. Averaging about 55 cm, it is hardy, tolerates group housing and suits beginners.
Thamnophis sirtalis is the most widely distributed snake in North America, ranging from the northwestern reaches of Canada to the southern tip of Florida. The typical pattern is yellow longitudinal stripes over a black, brown or green ground, but geographic variation is extensive and twelve subspecies are recognised. It averages about 55 cm and reaches a maximum of 137 cm. Diurnal, it favours the water's edge and both swims and climbs well. It eats fish, amphibians and earthworms, and in captivity takes frozen-thawed mice. Its saliva is mildly venomous but harmless to people. It is ovoviviparous and prolific, and in cold regions it overwinters communally. Small, hardy and tolerant of group housing, it is treated as a beginner's snake in Europe and North America, and several morphs are traded.
Source: Wikipedia (CC BY-SA 4.0)
The Common Garter Snake lives 10 years or more.
The Common Garter Snake grows to About 55cm on average (max 137cm).
Origin
North America, from southern Canada across the United States into Mexico, in forests, grasslands, wetlands and near watercourses
Lifespan
10 years or more
Size
About 55cm on average (max 137cm)
Humidity
Sources: ReptiFiles: Garter Snake Care Sheet / Reptile Database / Wikipedia (English)
Edited & verified by: BreederDirect editorial team
The taxonomic, regulatory, and husbandry data on this page are compiled and verified against the authoritative primary sources below.
Accepted name: Thamnophis sirtalis (Linnaeus, 1758)
Synonyms: Coluber sirtalis Linnaeus, 1758, Eutainia sirtalis Baird & Girard, 1853, Tropidonotus sirtalis Garman, 1884
Authority databases: Reptile Database
Nomenclature follows global taxonomic authority databases.
Not listed in the appendices of the Washington Convention. It does not fall under the specific animals listed in the Order for Enforcement of the Law Concerning the Protection and Management of Animals, nor is it designated as an invasive alien species.
Sources: CITES Appendices (species not listed) / Order for Enforcement of the Act on Welfare and Management of Animals (list of designated animals)
Regulations may change. Always verify the latest information with the relevant authorities.
Find listings for this species
35〜60%
Frozen-thawed mice, fish, earthworms, amphibians
Keep the basking surface at 29-32 C and the cool side at 23-27 C, dropping to 18-24 C at night. Cool-side air temperatures above 33 C are dangerous. Aim for 35-60% humidity, measured with a digital hygrometer probe placed in the middle of the enclosure.
Active climbers and swimmers, so allow at least 120 x 60 x 60 cm for a single adult. Provide a substrate layer at least 5 cm deep, topped with leaf litter to hold humidity and encourage exploration. A water container large enough for the whole snake to soak in should always be available.
In the wild it eats fish, amphibians and earthworms. In captivity the staple should be appropriately sized frozen-thawed mice; a diet of fish alone can cause thiamine deficiency.
Placid and tolerant of handling, though a startled snake will release a foul-smelling secretion from its cloaca. Its venom is very weak and a bite poses no danger to people.
Not listed on any CITES appendix, and not among the designated dangerous animals in the Japanese Act on Welfare and Management of Animals. One of the few snakes that can be kept in groups, but feed individuals separately to avoid accidents.
Beginner. This is a beginner-friendly species. No special equipment or experience is required, and it can be kept successfully with basic care setup.
The average lifespan of Common Garter Snake is 10 years or more. With proper care and nutrition, they can live a long and healthy life.
Common Garter Snake typically reaches About 55cm on average (max 137cm) as an adult. Size may vary depending on care conditions and individual genetics.
Common Garter Snake feeds on: Frozen-thawed mice, fish, earthworms, amphibians. Aim for a balanced diet with appropriate feeding frequency.
The price of Common Garter Snake varies significantly depending on morph, size, and lineage. Check our market price page for the latest pricing information.
Last updated: September 16, 2026