Connecticut is home to 15 species of snakes and only two are venomous. The Black racer (Coluber c. constrictor), Dekay's brownsnake (Storeria d. dekayi), Eastern ratsnake (Pantherophis obsoletus), Garternake (Thamnophis s. sirtalis), Hog-nosed snake (Heterodon platirhinos), milk snake (Lampropeltis t. triangulum), northern watersnake (Nerodia sipedon sipedon), redbelly snake (Storeria o. occipitomaculata), ribbonsnake (Thamnophis saurita), ring-necked snake (Diadophis punctatus edwardsii), smooth greensnake (Liochlorophis vernalis) and worm snake (Carphophis a. amoenus)) are non-venomous. The non-venomous Brahminy blind snake (Indotyphlops braminus) was introduced from Southeast Asia and has established a viable population in Connecticut.^[1] The Copperhead (Agkistrodon contortrix mokasen) and Timber rattlesnake (Crotalus horridus) are venomous.^[2] In the state of the Connecticut, the Timber rattlesnake is listed as endangered and Eastern ratsnake is regulated with both the Ribbonsnake and Hog-nosed snake as of special concern.^[3]

Scientific Name	Common name(s)	Image	Notes
Coluber constrictor constrictor[3]	Northern Black Racer[3]
Agkistrodon contortrix mokasen[3]	Northern Copperhead[3]		Venomous[3]
Storeria dekayi dekayi[3]	Northern Brown Snake / Dekay's Brownsnake[3]
Pantherophis alleghaniensis / Elaphe alleghaniensis[3]	Eastern Ratsnake[3]
Thamnophis sirtalis sirtalis[3]	Eastern Garter Snake[3]
Heterodon platirhinos[3]	Eastern Hognose Snake[3]
Lampropeltis triangulum triangulum[3]	Eastern Milksnake[3]
Nerodia sipedon sipedon[3]	Northern Water snake[3]
Storeria occipitomaculata occipitomaculata[3]	Northern Redbelly Snake[3]
Thamnophis saurita saurita[3]	Eastern Ribbonsnake[3]
Diadophis punctatus edwardsii[3]	Northern Ringneck Snake[3]
Opheodrys vernalis[3] / Liochlorophis vernalis	Smooth Green snake[3]
Crotalus horridus[3]	Timber Rattlesnake / cane-brake rattlesnake[3]		Venomous[3]
Carphophis amoenus amoenus[3]	Eastern Worm Snake[3]
Indotyphlops braminus[4]	Brahminy Blind Snake / Flowerpot Snake[5]