Reptiles & Amphibians of Colorado
The reptiles & amphibians most often spotted in Colorado, ranked by recent research-grade observations.
Most-observed reptiles & amphibians in Colorado
Western Terrestrial Garter Snake
Thamnophis elegans
6,101 observations
Woodhouse's Toad
Anaxyrus woodhousii
5,636 observations
Gopher Snake
Pituophis catenifer
5,630 observations
Prairie Lizard
Sceloporus consobrinus
3,660 observations · iNaturalist
Prairie Rattlesnake
Crotalus viridis
3,152 observations
American Bullfrog
Lithobates catesbeianus
2,272 observations
Plateau Fence Lizard
Sceloporus tristichus
1,811 observations · iNaturalist
Plains Garter Snake
Thamnophis radix
1,740 observations
Western Tiger Salamander
Ambystoma mavortium
1,662 observations · iNaturalist
North American Racer
Coluber constrictor
1,436 observations
Eastern Collared Lizard
Crotaphytus collaris
1,390 observations
Painted Turtle
Chrysemys picta
1,349 observations
Boreal Chorus Frog
Pseudacris maculata
1,331 observations
Pond Slider
Trachemys scripta
1,224 observations
Greater Short-horned Lizard
Phrynosoma hernandesi
1,183 observations
Six-lined Racerunner
Aspidoscelis sexlineatus
1,047 observations · iNaturalist
Common Snapping Turtle
Chelydra serpentina
1,042 observations
Common Side-blotched Lizard
Uta stansburiana
1,003 observations
Northern Leopard Frog
Lithobates pipiens
796 observations
Common Sagebrush Lizard
Sceloporus graciosus
692 observations
Colorado Checkered Whiptail
Aspidoscelis neotesselatus
622 observations · iNaturalist
Western Earless Lizard
Holbrookia maculata
555 observations
Plateau Striped Whiptail
Aspidoscelis velox
543 observations · iNaturalist
Ornate Box Turtle
Terrapene ornata
533 observations
Common Coachwhip
Masticophis flagellum
533 observations
Lined Snake
Tropidoclonion lineatum
489 observations
Western Whiptail
Aspidoscelis tigris
457 observations
Texas Horned Lizard
Phrynosoma cornutum
425 observations
Couch's Spadefoot
Scaphiopus couchii
419 observations · iNaturalist
Mexican Spadefoot
Spea multiplicata
386 observations
Plains Spadefoot
Spea bombifrons
379 observations
Western Milksnake
Lampropeltis gentilis
366 observations · iNaturalist
Smooth Greensnake
Opheodrys vernalis
338 observations
Common Watersnake
Nerodia sipedon
326 observations
Common Garter Snake
Thamnophis sirtalis
322 observations
Plains Hognose Snake
Heterodon nasicus
317 observations
Glossy Snake
Arizona elegans
312 observations
Plains Black-headed Snake
Tantilla nigriceps
287 observations · iNaturalist
Plains Leopard Frog
Lithobates blairi
273 observations
Great Plains Toad
Anaxyrus cognatus
228 observations
Ornate Tree Lizard
Urosaurus ornatus
227 observations
Spiny Softshell
Apalone spinifera
206 observations
Great Plains Ratsnake
Pantherophis emoryi
182 observations
Great Plains Ground Snake
Sonora episcopa
166 observations · iNaturalist
Chihuahuan Green Toad
Anaxyrus debilis
146 observations
Red-spotted Toad
Anaxyrus punctatus
142 observations
Common Checkered Whiptail
Aspidoscelis tesselatus
121 observations · iNaturalist
Many-lined Skink
Plestiodon multivirgatus
108 observations
Ring-necked Snake
Diadophis punctatus
107 observations
Long-nosed Snake
Rhinocheilus lecontei
97 observations