
Source: Wikimedia Commons
Thamnophis marcianus
A garter snake with a distinct black checkerboard pattern over a greenish ground. It ranges from the southwestern United States into Central America and usually stays a compact 46-61 cm.
Thamnophis marcianus ranges from the southwestern United States through Mexico into Central America. Its name comes from the black checkerboard pattern along a greenish back, and the head markings are also distinctive. Adults are usually 46-61 cm and reach a maximum of 107 cm. It lives in desert, grassland, shrubland and forest from sea level to 2,200 m, always favouring places close to water. Unlike most garter snakes, which are diurnal, this species is at least partly nocturnal. It eats frogs, small fish and earthworms; in captivity it will take mice, though individuals can become fussy feeders. It is ovoviviparous, parthenogenesis has been reported, and two subspecies are recognised.
Source: Wikipedia (CC BY-SA 4.0)
The Checkered Garter Snake lives 10 years or more.
The Checkered Garter Snake grows to 46-61cm (max 107cm).
Origin
The southwestern United States (Texas, New Mexico, Arizona and neighbouring states), Mexico, Belize and Central America, in desert, grassland and shrubland near water
Lifespan
10 years or more
Size
46-61cm (max 107cm)
Humidity
35〜60%
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 marcianus (Baird & Girard, 1853)
Synonyms: Eutainia marciana Baird & Girard, 1853, Eutaenia elegans marciana Cope, 1900, Thamnophis ruthveni Hartweg & Oliver, 1938
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
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, with humidity around 35-60%. Avoid cool-side air temperatures above 33 C, which risk heat stress.
Allow at least 120 x 60 x 60 cm per adult. Provide at least 5 cm of substrate topped with leaf litter. Because the species is partly nocturnal, give it hides on both the warm and cool ends where it can settle during the day.
In the wild it takes frogs, small fish and earthworms. It can be converted to frozen-thawed mice in captivity, but this species is prone to becoming a fussy feeder and may suddenly refuse them. If fish are fed, watch for thiaminase-induced vitamin B1 deficiency.
Generally placid, but a startled snake will discharge a foul-smelling fluid from its cloaca and may bite. Its venom is very weak and poses no danger to people.
Not listed on any CITES appendix, and not designated as a dangerous animal or invasive alien species in Japan. Parthenogenesis has been reported, so a lone female may still produce young.
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 Checkered Garter Snake is 10 years or more. With proper care and nutrition, they can live a long and healthy life.
Checkered Garter Snake typically reaches 46-61cm (max 107cm) as an adult. Size may vary depending on care conditions and individual genetics.
Checkered Garter Snake feeds on: Frozen-thawed mice, fish, earthworms, amphibians. Aim for a balanced diet with appropriate feeding frequency.
The price of Checkered 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