Snakes of Grant County, New Mexico

Snake species observed in Grant County, verified on iNaturalist or by museum records, plus one species that is likely to occur here, but hasn’t been documented yet (Western Massasauga (Sistrurus tergeminus)).

Harmless Snakes

  • Glossy Snake (Arizona elegans)
  • Sonoran Whipsnake (Coluber bilineatus) 3
  • Coachwhip (Coluber flagellum)
  • Striped Whipsnake (Coluber taeniatus)
  • Ring-Necked Snake (Diadophis punctatus) 1
  • Chihuahuan Hook-Nosed Snake (Gyalopion canum) 3
  • Mexican Hog-Nosed Snake (Heterodon kennerlyi) 1
  • Chihuahuan Nightsnake (Hypsiglena jani) 1
  • Western Milksnake (Lampropeltis gentilis) 3
  • Arizona Mountain Kingsnake (Lampropeltis pyromelana)
  • Desert Kingsnake (Lampropeltis splendida)
  • Great Plains Ratsnake (Pantherophis emoryi) 3
  • Gophersnake (Pituophis catenifer)
  • New Mexico Threadsnake (Rena dissecta)
  • Western Threadsnake (Rena humilis)
  • Long-Nosed Snake (Rhinocheilus lecontei)
  • Eastern Patch-Nosed Snake (Salvadora grahamiae)
  • Western Patch-Nosed Snake (Salvadora hexalepis)
  • Western Groundsnake (Sonora semiannulata)
  • Smith’s Black-Headed Snake (Tantilla hobartsmithi) 1
  • Plains Black-Headed Snake (Tantilla nigriceps) 1
  • Black-Necked Gartersnake (Thamnophis cyrtopsis)
  • Terrestrial Gartersnake (Thamnophis elegans)
  • Mexican Gartersnake (Thamnophis eques) 2,3
  • Checkered Gartersnake (Thamnophis marcianus)
  • Narrow-Headed Gartersnake (Thamnophis rufipunctatus) 2,3
  • Sonoran Lyresnake (Trimorphodon lambda) 1
  • Texas Lyresnake (Trimorphodon vilkinsonii) 1

Venomous Snakes

  • Western Diamond-Backed Rattlesnake (Crotalus atrox)
  • Arizona Black Rattlesnake (Crotalus cerberus) 3
  • Rock Rattlesnake (Crotalus lepidus)
  • Western Black-Tailed Rattlesnake (Crotalus molossus)
  • Eastern Black-Tailed Rattlesnake (Crotalus ornatus)
  • Prairie Rattlesnake (Crotalus viridis)
  • Western Massasauga (Sistrurus tergeminus) 4
  • Sonoran Coralsnake (Micruroides euryxanthus) 3


Species discussed in WILL class 11/04/2020 are bolded

  1. Mildly venomous (not medically significant)
  2. Listed under the Endangered Species Act as Threatened
  3. Rarely observed in Grant County
  4. Not yet documented in Grant County, but seems likely to show up here

HUGE THANK YOU to our Fall 2019 Aldo Leopold HS intern, Marisa, for putting this list together — fabulous research on her part!