Texas
Snakes in Williamson County
36 species have been documented here, 6 of them venomous.
Venomous snakes in Williamson County
Full guide & what to do if bitten →
Western Diamond-backed RattlesnakeCrotalus atroxVenomousHeavy body, broad triangular head, vertical (cat-like) pupils, and a segmented keratin rattle at the tail tip.
Texas CoralsnakeMicrurus tenerVenomousRings of red, yellow, and black where red touches yellow; small rounded head and round pupils.
Northern CottonmouthAgkistrodon piscivorusVenomousHeavy body, triangular head, vertical pupils, and a heat-sensing pit between each eye and nostril.
Broad-banded CopperheadAgkistrodon laticinctusVenomousHeavy body, triangular head, vertical pupils, and a heat-sensing pit between each eye and nostril.
Eastern CopperheadAgkistrodon contortrixVenomousHeavy body, triangular head, vertical pupils, and a heat-sensing pit between each eye and nostril.
Eastern Black-tailed RattlesnakeCrotalus ornatusVenomousHeavy body, broad triangular head, vertical (cat-like) pupils, and a segmented keratin rattle at the tail tip.
Every snake recorded in Williamson County
Plain-bellied Watersnake
Nerodia erythrogaster
Harmless
Western Ratsnake
Pantherophis obsoletus
Harmless
Western Diamond-backed Rattlesnake
Crotalus atrox
Venomous
Western Ribbon Snake
Thamnophis proximus
Harmless
Rough Earthsnake
Virginia striatula
Harmless
Diamondback Watersnake
Nerodia rhombifer
Harmless
Rough Greensnake
Opheodrys aestivus
Harmless
DeKay's Brownsnake
Storeria dekayi
Harmless
No photo
Mexican Whip Snake
Masticophis lineatus
Harmless
Common Coachwhip
Masticophis flagellum
Harmless
Texas Blind Snake
Rena dulcis
Harmless
Texas Coralsnake
Micrurus tener
Venomous
North American Racer
Coluber constrictor
Harmless
Black-necked Garter Snake
Thamnophis cyrtopsis
Harmless
Texas Patch-nosed Snake
Salvadora lineata
Harmless
Eastern Hognose Snake
Heterodon platirhinos
Harmless
Northern Cottonmouth
Agkistrodon piscivorus
Venomous
Checkered Garter Snake
Thamnophis marcianus
Harmless
Broad-banded Copperhead
Agkistrodon laticinctus
Venomous
Great Plains Ratsnake
Pantherophis emoryi
Harmless
Prairie Kingsnake
Lampropeltis calligaster
Harmless
Speckled Kingsnake
Lampropeltis holbrooki
Harmless
Gopher Snake
Pituophis catenifer
Harmless
Flat-headed Snake
Tantilla gracilis
Harmless
Tantilla selmae
Harmless
Great Plains Ground Snake
Sonora episcopa
Harmless
Glossy Snake
Arizona elegans
Harmless
Ring-necked Snake
Diadophis punctatus
Harmless
Eastern Copperhead
Agkistrodon contortrix
Venomous
Lined Snake
Tropidoclonion lineatum
Harmless
Eastern Kingsnake
Lampropeltis getula
Harmless
Common Garter Snake
Thamnophis sirtalis
Harmless
Long-nosed Snake
Rhinocheilus lecontei
Harmless
Striped Whipsnake
Masticophis taeniatus
Harmless
Eastern Black-tailed Rattlesnake
Crotalus ornatus
Venomous
Ground Snake
Sonora semiannulata
Harmless
Compiled from verified GBIF & iNaturalist observations. Informational only.