Reptiles & Amphibians of Denver, Colorado
The reptiles & amphibians most often spotted near Denver, ranked by recent research-grade observations.
Most-observed reptiles & amphibians near Denver
Gopher Snake
Pituophis catenifer
2,122 observations
Western Terrestrial Garter Snake
Thamnophis elegans
2,104 observations
Woodhouse's Toad
Anaxyrus woodhousii
1,887 observations
American Bullfrog
Lithobates catesbeianus
1,120 observations
Prairie Rattlesnake
Crotalus viridis
846 observations
Prairie Lizard
Sceloporus consobrinus
756 observations · iNaturalist
Pond Slider
Trachemys scripta
751 observations
Painted Turtle
Chrysemys picta
750 observations
Plains Garter Snake
Thamnophis radix
669 observations
North American Racer
Coluber constrictor
648 observations
Common Snapping Turtle
Chelydra serpentina
592 observations
Six-lined Racerunner
Aspidoscelis sexlineatus
555 observations · iNaturalist
Boreal Chorus Frog
Pseudacris maculata
491 observations
Western Tiger Salamander
Ambystoma mavortium
292 observations · iNaturalist
Northern Leopard Frog
Lithobates pipiens
232 observations
Lined Snake
Tropidoclonion lineatum
162 observations
Western Milksnake
Lampropeltis gentilis
144 observations · iNaturalist
Common Watersnake
Nerodia sipedon
139 observations
Common Garter Snake
Thamnophis sirtalis
112 observations
Spiny Softshell
Apalone spinifera
88 observations
Smooth Greensnake
Opheodrys vernalis
58 observations
Plains Spadefoot
Spea bombifrons
46 observations
Many-lined Skink
Plestiodon multivirgatus
36 observations
Greater Short-horned Lizard
Phrynosoma hernandesi
34 observations
Plains Hognose Snake
Heterodon nasicus
32 observations
Ornate Box Turtle
Terrapene ornata
24 observations
Colorado Checkered Whiptail
Aspidoscelis neotesselatus
22 observations · iNaturalist
Western Earless Lizard
Holbrookia maculata
11 observations
Plains Black-headed Snake
Tantilla nigriceps
7 observations · iNaturalist
Great Plains Toad
Anaxyrus cognatus
4 observations
False Map Turtle
Graptemys pseudogeographica
3 observations
Three-toed Box Turtle
Terrapene triunguis
3 observations · iNaturalist
Northern Map Turtle
Graptemys geographica
2 observations
Brown Anole
Anolis sagrei
2 observations
Greenhouse Frog
Eleutherodactylus planirostris
1 observation
Pacific chorus frog
Pseudacris regilla
1 observation
Bearded Dragons
Pogona
1 observation · iNaturalist
Green Anole
Anolis carolinensis
1 observation
Common Bluetongue
Tiliqua scincoides
1 observation · iNaturalist
Red Cornsnake
Pantherophis guttatus
1 observation
Ouachita Map Turtle
Graptemys ouachitensis
1 observation · iNaturalist
Red-footed Tortoise
Chelonoidis carbonarius
1 observation · iNaturalist
Great Plains Ground Snake
Sonora episcopa
1 observation · iNaturalist
Green Treefrog
Dryophytes cinereus
1 observation · iNaturalist