Rossman’s Garter Snake

Thamnophis rossmani Conant, 2000

Max. Recorded Length 64.8 cm / 25.5 inches (SVL)
Range Nayarit
Pet Trade Availability ☆☆☆☆ not available

Note: These species pages are in various stages of completion. Some are basically finished; others are very much under construction. Please be patient while I work on this section.


A medium-sized, brown garter snake with yellow-green stripes from the vicinity of Tepic, in the Mexican state of Nayarit, where it has been observed catching small fish from streams. Thamnophis rossmani was previously considered a disjunct population of Mexican Garter Snake, Thamnophis eques. Conant (2000) elevated it to full species status based on morphological differences. The largest specimen collected was a female 74.5 cm in length, but had a severely stubbed tail and would have been even longer if intact; that specimen’s snout-vent length of 64.8 cm is listed instead.


The habitat of Rossman’s Garter Snake is quite limited, and, according to Conant, has suffered significant alteration since the 1960s; this species may be at significant risk if not already extinct.

Captive Care

No information exists on the captive care of this species.

If you have experience with this species and would like to share, please contact me.

For general information on keeping garter snakes in captivity, please see the Care Guide.

Articles and News


Conant, Roger. 2000. “A new species of garter snake from western Mexico.” Occasional Papers of the Museum of Natural Science 76.