Order: Squamata - Snakes

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Colorado Snake Species List:                          *Species listed in orange have completed accounts.

Arizona elegans 
Charina bottae 
Coluber constrictor 
Coluber flagellum 
Coluber taeniatus 
Crotalus oreganus
Crotalus viridis 
Diadophis punctatus 
Heterodon nasicus 
Heterodon platirhinos 
Hypsiglena chlorophaea 
Hypsiglena jani 
Lampropeltis californiae 
Lampropeltis holbrooki 
Lampropeltis triangulum
Nerodia sipedon  

Glossy Snake 
Northern Rubber Boa (possible occurrence)
North American Racer 
Coachwhip 
Striped Whipsnake 
Western (Midget Faded) Rattlesnake 
Prairie Rattlesnake 
Ring-necked Snake 
Plains Hog-nosed Snake
Eastern Hog-nosed Snake 
Desert Nightsnake 
Chihuahuan Nightsnake 
California Kingsnake 
Speckled Kingsnake 
Milksnake 
Common Watersnake 

Opheodrys vernalis 
Pantherophis emoryi 
Pituophis catenifer 
Rena dissectus 
Rhinocheilus lecontei 
Sistrurus catenatus 
Sonora semiannulata 
Storeria dekayi 
Tantilla hobartsmithi 
Tantilla nigriceps
Thamnophis cyrtopsis 
Thamnophis elegans 
Thamnophis proximus 
Thamnophis radix 
Thamnophis sirtalis 
Tropidoclonion lineatum

Smooth Greensnake 
Great Plains Ratsnake 
Gophersnake (Bullsnake)
New Mexico Threadsnake 
Long-nosed Snake 
Massasauga 
Western Groundsnake 
DeKay's Brownsnake
Smith's Black-headed Snake
Plains Black-headed Snake
Black-necked Gartersnake 
Terrestrial Gartersnake 
Western Ribbonsnake 
Plains Gartersnake 
Common Gartersnake 
Lined Snake

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Family: Colubridae

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Genus: Coluber - North American Racers, Coachwhips, & Whipsnakes

North American Racer
Coluber constrictor

Photo: Lori Bollendonk, loriboll@aol.com

Coachwhip
Coluber flagellum

Photo: Aaron Balogh

Striped Whipsnake
Coluber taeniatus

Photo: C. J. Vialpando, Mesa County Colorado, May 2013.

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Genus: Heterodon - North American Hog-nosed Snakes

Plains Hog-nosed Snake
Heterodon nasicus

Eastern Hog-nosed Snake
Heterodon platirhinos

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Genus: Pantherophis - North American Ratsnakes

Great Plains Ratsnake
Pantherophis emoryi 

Photo: Aaron Balogh

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Genus: Thamnophis - Gartersnakes

Terrestrial Gartersnake
Thamnophis elegans

Common Gartersnake
Thamnophis sirtalis

Western Ribbonsnake
Thamnophis proximus

Photo: Danny Martin, 2013.

Black-necked Gartersnake
Thamnophis cyrtopsis 

Photo: Danny Martin, 2014.

Plains Gartersnake
Thamnophis radix

Photo: Kevin Urbanek.

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Genus: Tropidoclonion - Lined Snakes

Lined Snake
Tropidoclonion lineatum 

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Genus: Nerodia - North American Watersnakes

Common Watersnake
Nerodia sipedon 

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Genus: Arizona - Glossy Snake

Glossy Snake
Arizona elegans 

Glossy Snake on road. Photo: Kevin Urbanek.

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Genus: Rhinocheilus - Long-nosed Snakes

Long-nosed Snake
Rhinocheilus lecontei  

Photo: Tim Warfel.

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Genus: Opheodrys - Greensnakes

Smooth Greensnake
Opheodrys vernalis

Photo: Tim Warfel.

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Genus: Diadophis - Ring-necked Snakes

Ring-necked Snake
Diadophis punctatus

Photo: Aaron Balogh

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Genus: Storeria - North American Brownsnakes

DeKay's Brownsnake   
Storeria dekayi

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Genus: Sonora - North American Groundsnakes

Western Groundsnake   
Sonora semiannulata

Photo: Asher Currie, 2014, Otero Co., Colorado.

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Genus: Tantilla - Black-headed, Crowned, & Flat-headed Snakes

Plains Black-headed Snake   
Tantilla nigriceps

Smith's Black-headed Snake   
Tantilla hobartsmithi

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Genus: Pituophis - Bullsnakes, Pinesnakes & Gophersnakes

Gophersnake (Bullsnake)  
Pituophis catenifer (P. c. sayi)

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Genus: Lampropeltis - Kingsnakes

Speckled Kingsnake   
Lampropeltis holbrooki

Photo: Tim Warfel, 2009.

California Kingsnake   
Lampropeltis californiae 

Milksnake   
Lampropeltis triangulum

Photo: Kevin Young, 2012.

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Genus: Hypsiglena - North American Nightsnakes

Desert Nightsnake   
Hypsiglena chlorophaea

Chihuahuan Nightsnake    
Hypsiglena jani

Photo: Kevin Urbanek

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Family: Leptotyphlopidae

Genus: Rena - Threadsnakes

New Mexico Threadsnake   
Rena dissectus

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Family: Viperidae

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Genus: Crotalus - Rattlesnakes

Prairie Rattlesnake                                *Venomous
Crotalus viridis

Photo: Danny Martin, 2014, Pueblo Co., Colorado.

Western Rattlesnake               
*Venomous
Crotalus oreganus

Photo: Brian Holmes, Rio Blanco Co., Colorado.

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Genus: Sistrurus - Ground Rattlesnakes

Massasauga                                         *Venomous
Sistrurus catenatus

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Family: Boidae

Genus: Charina - Rubber Boas

Rubber Boa          *Possible occurrence in Colorado
Charina bottae

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