Non-Venomous Snakes

• Blind Snake: Rare
  • (Texas)New Mexican Blind Snake - Leptotyphlops d. dissectus (S.E. CO)

• Glossy Snake
  Glossy snake
  Arizona elegans is a medium-sized colubrid snake commonly referred to as the glossy snake. The genus Arizona has only one officially recognized species, A. elegans, with several subspecies. Some have recommended that A...
  
  : Secure
  • Kansas Glossy Snake - Arizona e. elegans (E. CO)
  • Painted Desert Glossy Snake - Arizona e. philipi (S.W. CO)

• Racer
  Racer
  -Snakes:* Coluber, a genus of harmless colubrid snakes.* Drymobius, a.k.a. neotropical racers, a genus of harmless colubrid snakes.* Masticophis, a.k.a...
  
  : Common
  • E. Yellow Bellied Racer - Coluber constrictor flaviventris
    Coluber constrictor flaviventris
    The eastern yellowbelly racer is a subspecies of racer, a nonvenomous, colubrid snake.- Description :...
    
    (E. CO)
  • W. Yellow Bellied Racer - Coluber c. mormon (W. CO)

• Ringneck Snake: Secure
  • Prairie Ringneck Snake - Diadophis p. arnyi (S.E. CO)
  • Regal Ringneck Snake - Diadophis p. regalis (Note noted with hammerson, this could be a possible occurrence in extreme S.W. CO)

• Great Plains Rat Snake
  Great Plains Rat Snake
  The Great Plains Rat Snake is a species of non-venomous rat snake native to the eastern two thirds of the United States, from New Jersey to Nebraska, to Colorado, south to Texas, and into northern Mexico. It is sometimes considered a subspecies of the corn snake, which is commonly kept as a pet...
  
   Common
  • Pantherophis g. emoryi
  • Pantherophis g. intermontana(Valid subspecies?)

• Western Hognose Snake: Nasicus is secure.
  • Plains Hognose Snake - Heterodon n. nasicus (E. CO)
  • E. Hognose Snake - Heterodon platirhinos (Extreme E. CO)

• Night Snake: Secure
  • Texas Nightsnake - Hypsiglena t. janii (S.E. CO)
  • Mesa Verde Nightsnake - Hypsiglena t. loreala (W. CO)

• Common Kingsnake: Uncommon
  • Kingsnake Intergrade - Lampropeltis g. holbrooki/splendida(Speckled/Desert) S.E. CO
  • California Kingsnake - Lampropeltis g. californiae (Extreme S.W. CO)

• Milk Snake
  Milk Snake
  The milk snake or milksnake is a species of king snake. There are 25 subspecies among the milk snakes, including the commonly named scarlet kingsnake...
  
  : Secure
  • Utah Milksnake - Lampropeltis t. taylori (West-Central CO)
  • Lampropeltis t. taylori/celaenops (Utah/New Mex) S.W. & South-Central CO
  • Lampropeltis t. multistriata/gentilis(Pale/Central Plains) N.E. CO
  • Central Plains Milksnake - Lampropeltis t. gentilis/ Rest of E. CO

• Green Snake
  Opheodrys
  Opheodrys is a genus of small to medium-sized colubrid snakes commonly referred to as green snakes. In North America the genus consists of two distinct species with five recognized subspecies...
  
  : Secure
  • W. Smooth Green Snake - Liochlorophis vernalis blanchardi (Central to Western Slope)

• Coachwhip: Common
  • W. Coachwhip - Masticophis f. testaceus (East to South-Central to Southeastern CO)
  • Red Coachwhip - Masticophis f. piceus ( This snake may occur in extreme S.W. Colorado, but there is no evidence to suggest such. The closest populations are in S.W. Utah.

• Striped Whipsnake
  Striped Whipsnake
  The Striped Whipsnake is a species of nonvenomous colubrid snake that is closely related to the California Whipsnake . It is native to the western United States and northern Mexico....
  
  : Common
  • Desert Striped Whipsnake - Masticophis t. taeniatus (W. CO)

• Watersnake: Secure
  • Northern Watersnake - Nerodia s. sipedon (N.E. to S.W. CO)

• Bullsnake/Gophersnake
  Bullsnake
  The bullsnake ' is a large non-venomous colubrid snake, widespread in the central part of the United States, northern Mexico, and southwestern Saskatchewan and Alberta Canada. It is currently considered a subspecies of the gopher snake '...
  
  : Common
  • Bullsnake - Pituophis c. sayi (Eastern Slope)
  • Great Basin Gophersnake - Pituophis c. deserticola (Western Slope)
  • Sonoran Gophersnake - Pituophis c. affinis ( Intergradation may occur with deserticola in Colorado)

• Longnose Snake: Uncommon
  • Texas Longnose Snake - Rhinocheilus l. tessellatus (S.E. CO)

• Black-headed Snake: Secure
  • S.W. Black-headed Snake - Tantilla hobartsmithi (W. CO)
  • Plains Black-headed Snake - Tantilla n. nigriceps (Eastern Slope)

• Garter Snake
  Garter snake
  The Garter snake is a Colubrid snake genus common across North America, ranging from Alaska and Canada to Central America. It is the single most widely distributed genus of reptile in North America. The garter snake is also the Massachusettsstate reptile.There is no real consensus on the...
  
  :
  • W. Blackneck Garter Snake - Thamnophis c. cyrtopsis (S.E. to S.W. CO) Uncommon
  • Western Terrestrial Garter Snake - Thamnophis e. vagrans (Most of Colorado) Common
  • W. Plains Garter Snake - Thamnophis r. haydenii (Eastern Slope) Common
  • Red Sided Garter Snake - Thamnophis s. parietalis (North-Central to N.E. CO) Common
• Arid Land Ribbonsnake - Thamnophis p. diabolicus (S.E. CO) RARE!

• Brown Snake
  Brown snake
  Brown snake is the common name given to a number of very different species of snakes:*The genus Pseudonaja, Australian brown snakes*The genus Storeria, North American brown snakes...
  
  : Rare(May be extirpated)
  • Texas Brown Snake - Storeria d. texana (This species was reportedly found in Las Animas County by Arthur E. Beardsley(1883). This species may be extirpated, but fieldherping might yield specimens.

• Lined Snake - Tropidoclonion l. lineatum (Generally Eastern Slope) Secure

• Rubber Boa
  Rubber Boa
  The Rubber Boa is a snake in the family Boidae that is native to the Western United States.-Taxonomy:The Rubber Boa is a snake in the family Boidae and genus Charina. The name Charina is from the Greek for graceful or delightful, and the name bottae honors Dr. Paolo E. Botta, an Italian ship's...
  
   - Charina bottae (This species may occur in Colorado, but no substantial evidence suggest such, as of yet.)

Venomous Snakes

• Prairie Rattlesnake: Common (Crotalus viridis viridis) western 2/3 of the state.
• Midget Faded Rattlesnake
  Crotalus oreganus
  Crotalus oreganus is a venomous pitviper species found in North America in the western United States, parts of British Columbia and northwestern Mexico. Seven subspecies are currently recognized, including the nominate subspecies described here....
  
  : Secure (Crotalus oreganus concolor) West of the continental divide.

• Massasauga: Secure
  • Western Massasauga (Integrade between S.c. edwardsii and S.c.tergeminus)

• Western Diamondback Rattlesnake
  Crotalus atrox
  Crotalus atrox, the "western diamondback rattlesnake", is a venomous rattlesnake species found in the United States and Mexico. It is likely responsible for the majority of snakebite fatalities in northern Mexico and the second greatest number in the USA after C. adamanteus. No subspecies are...
  
  : Unknown (Crotalus atrox), Southeast Colorado.

See also

• List of Colorado Reptiles
• Colorado State University
• Colorado Herpetological Society