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Reptiles & Amphibians of Denver, Colorado

The reptiles & amphibians most often spotted near Denver, ranked by recent research-grade observations.

16,088
recent observations
44
species listed
44
reptiles & amphibians

Naturalists have logged 16,088 research-grade observations across the 44 most-recorded species near Denver. The most frequently seen is the Western Terrestrial Garter Snake, with 2,315 recorded sightings.

Most-observed reptiles & amphibians near Denver

Western Terrestrial Garter Snake
Thamnophis elegans
2,315 observations
Gopher Snake
Pituophis catenifer
2,287 observations
Woodhouse's Toad
Anaxyrus woodhousii
2,019 observations
American Bullfrog
Lithobates catesbeianus
1,264 observations
Prairie Rattlesnake
Crotalus viridis
945 observations
Prairie Lizard
Sceloporus consobrinus
887 observations
Painted Turtle
Chrysemys picta
811 observations
Pond Slider
Trachemys scripta
789 observations
Plains Garter Snake
Thamnophis radix
737 observations
North American Racer
Coluber constrictor
699 observations
Common Snapping Turtle
Chelydra serpentina
639 observations
Six-lined Racerunner
Aspidoscelis sexlineatus
618 observations · iNaturalist
Boreal Chorus Frog
Pseudacris maculata
496 observations
Western Tiger Salamander
Ambystoma mavortium
324 observations
Northern Leopard Frog
Lithobates pipiens
241 observations
Lined Snake
Tropidoclonion lineatum
174 observations
Common Watersnake
Nerodia sipedon
161 observations
Western Milksnake
Lampropeltis gentilis
148 observations
Common Garter Snake
Thamnophis sirtalis
118 observations
Spiny Softshell
Apalone spinifera
96 observations
Smooth Greensnake
Opheodrys vernalis
62 observations
Plains Spadefoot
Spea bombifrons
47 observations
Many-lined Skink
Plestiodon multivirgatus
40 observations
Plains Hognose Snake
Heterodon nasicus
35 observations
Greater Short-horned Lizard
Phrynosoma hernandesi
35 observations
Colorado Checkered Whiptail
Aspidoscelis neotesselatus
34 observations
Ornate Box Turtle
Terrapene ornata
24 observations
Western Earless Lizard
Holbrookia maculata
11 observations
Plains Black-headed Snake
Tantilla nigriceps
7 observations
False Map Turtle
Graptemys pseudogeographica
4 observations
Great Plains Toad
Anaxyrus cognatus
4 observations
Three-toed Box Turtle
Terrapene triunguis
3 observations
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
Green Anole
Anolis carolinensis
1 observation
Common Bluetongue
Tiliqua scincoides
1 observation · iNaturalist
Yellow Mud Turtle
Kinosternon flavescens
1 observation
Red Cornsnake
Pantherophis guttatus
1 observation
Ouachita Map Turtle
Graptemys ouachitensis
1 observation
Red-footed Tortoise
Chelonoidis carbonarius
1 observation
Great Plains Ground Snake
Sonora episcopa
1 observation
Green Treefrog
Dryophytes cinereus
1 observation · iNaturalist

Built from recent research-grade iNaturalist observations. Identifications are community-sourced and may occasionally be wrong, and the ranking reflects where people record and photograph wildlife, so a species seen often here is not necessarily rare elsewhere. Some plants and animals are only out in certain seasons. Treat this as a lively snapshot of what people are finding, not a formal checklist.

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