Texas
Snakes in Collin County
30 species have been documented here, 5 of them venomous.
Venomous snakes in Collin County
Full guide & what to do if bitten →
Eastern CopperheadAgkistrodon contortrixVenomousHeavy body, triangular head, vertical pupils, and a heat-sensing pit between each eye and nostril.
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.
Timber RattlesnakeCrotalus horridusVenomousHeavy body, broad triangular head, vertical (cat-like) pupils, and a segmented keratin rattle at the tail tip.
Western Diamond-backed RattlesnakeCrotalus atroxVenomousHeavy body, broad triangular head, vertical (cat-like) pupils, and a segmented keratin rattle at the tail tip.
Every snake recorded in Collin County
Plain-bellied Watersnake
Nerodia erythrogaster
Harmless
Western Ratsnake
Pantherophis obsoletus
Harmless
Eastern Copperhead
Agkistrodon contortrix
Venomous
Diamondback Watersnake
Nerodia rhombifer
Harmless
Rough Earthsnake
Virginia striatula
Harmless
Rough Greensnake
Opheodrys aestivus
Harmless
DeKay's Brownsnake
Storeria dekayi
Harmless
North American Racer
Coluber constrictor
Harmless
Northern Cottonmouth
Agkistrodon piscivorus
Venomous
Common Garter Snake
Thamnophis sirtalis
Harmless
Broad-banded Copperhead
Agkistrodon laticinctus
Venomous
Western Ribbon Snake
Thamnophis proximus
Harmless
Ring-necked Snake
Diadophis punctatus
Harmless
Great Plains Ratsnake
Pantherophis emoryi
Harmless
Lined Snake
Tropidoclonion lineatum
Harmless
Speckled Kingsnake
Lampropeltis holbrooki
Harmless
Common Coachwhip
Masticophis flagellum
Harmless
No photo
Mexican Whip Snake
Masticophis lineatus
Harmless
Prairie Kingsnake
Lampropeltis calligaster
Harmless
Banded Watersnake
Nerodia fasciata
Harmless
Common Watersnake
Nerodia sipedon
Harmless
Gopher Snake
Pituophis catenifer
Harmless
Timber Rattlesnake
Crotalus horridus
Venomous
Checkered Garter Snake
Thamnophis marcianus
Harmless
Flat-headed Snake
Tantilla gracilis
Harmless
Graham's Crawfish Snake
Regina grahamii
Harmless
Tantilla selmae
Harmless
Western Diamond-backed Rattlesnake
Crotalus atrox
Venomous
Eastern Kingsnake
Lampropeltis getula
Harmless
Western Milksnake
Lampropeltis gentilis
Harmless
Compiled from verified GBIF & iNaturalist observations. Informational only.