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Reptiles & Amphibians of Colorado

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

59,470
recent observations
50
species listed
50
reptiles & amphibians

Naturalists have logged 59,470 research-grade observations across the 50 most-recorded species in Colorado. The most frequently seen is the Western Terrestrial Garter Snake, with 6,745 recorded sightings.

Most-observed reptiles & amphibians in Colorado

Western Terrestrial Garter Snake
Thamnophis elegans
6,745 observations
Woodhouse's Toad
Anaxyrus woodhousii
6,182 observations
Gopher Snake
Pituophis catenifer
6,079 observations
Prairie Lizard
Sceloporus consobrinus
4,271 observations
Prairie Rattlesnake
Crotalus viridis
3,551 observations
American Bullfrog
Lithobates catesbeianus
2,623 observations
Plateau Fence Lizard
Sceloporus tristichus
2,038 observations
Plains Garter Snake
Thamnophis radix
1,911 observations
Western Tiger Salamander
Ambystoma mavortium
1,836 observations
North American Racer
Coluber constrictor
1,551 observations
Eastern Collared Lizard
Crotaphytus collaris
1,494 observations
Painted Turtle
Chrysemys picta
1,459 observations
Boreal Chorus Frog
Pseudacris maculata
1,398 observations
Greater Short-horned Lizard
Phrynosoma hernandesi
1,293 observations
Pond Slider
Trachemys scripta
1,287 observations
Six-lined Racerunner
Aspidoscelis sexlineatus
1,176 observations · iNaturalist
Common Snapping Turtle
Chelydra serpentina
1,129 observations
Common Side-blotched Lizard
Uta stansburiana
1,091 observations
Northern Leopard Frog
Lithobates pipiens
894 observations
Common Sagebrush Lizard
Sceloporus graciosus
737 observations
Colorado Checkered Whiptail
Aspidoscelis neotesselatus
719 observations
Plateau Striped Whiptail
Aspidoscelis velox
613 observations
Western Earless Lizard
Holbrookia maculata
607 observations
Ornate Box Turtle
Terrapene ornata
593 observations
Common Coachwhip
Masticophis flagellum
581 observations
Lined Snake
Tropidoclonion lineatum
541 observations
Couch's Spadefoot
Scaphiopus couchii
498 observations
Texas Horned Lizard
Phrynosoma cornutum
497 observations
Western Whiptail
Aspidoscelis tigris
477 observations
Mexican Spadefoot
Spea multiplicata
436 observations
Plains Spadefoot
Spea bombifrons
412 observations
Western Milksnake
Lampropeltis gentilis
393 observations
Common Watersnake
Nerodia sipedon
368 observations
Smooth Greensnake
Opheodrys vernalis
368 observations
Common Garter Snake
Thamnophis sirtalis
347 observations
Plains Hognose Snake
Heterodon nasicus
346 observations
Glossy Snake
Arizona elegans
343 observations
Plains Leopard Frog
Lithobates blairi
334 observations
Plains Black-headed Snake
Tantilla nigriceps
326 observations
Great Plains Toad
Anaxyrus cognatus
250 observations
Ornate Tree Lizard
Urosaurus ornatus
241 observations
Spiny Softshell
Apalone spinifera
225 observations
Great Plains Ratsnake
Pantherophis emoryi
203 observations
Great Plains Ground Snake
Sonora episcopa
192 observations
Red-spotted Toad
Anaxyrus punctatus
159 observations
Chihuahuan Green Toad
Anaxyrus debilis
157 observations
Common Checkered Whiptail
Aspidoscelis tesselatus
142 observations
Ring-necked Snake
Diadophis punctatus
126 observations
Many-lined Skink
Plestiodon multivirgatus
118 observations
Long-nosed Snake
Rhinocheilus lecontei
113 observations

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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