Masticophis flagellum

Family Colubridae

Adults 36" to 80" in length. Color gray, tan, pink, or red; sometimes with dark crossbars on neck. Crossbars prominent on anterior of juveniles. Slender body, with smooth scales. Divided anal plate.
Elevation Range:
Below 6000' in eastern and southeastern Colorado; to 7700' in the Wet Mountains, Custer County.
Subspecies in Colorado:
Masticophis flagellum testaceus
Masticophis flagellum piceus may occur in extreme southwestern Colorado.
Photo from Hammerson, 1986.
Used with permission.
CountyRef. CountyRef. CountyRef. CountyRef.
Adams  Dolores  La Plata  Pitkin 
Alamosa  Douglas  Lake  ProwersH
Eagle  Larimer  PuebloH
Archuleta  El PasoH Las AnimasH Rio Blanco 
BacaH Elbert  LincolnGAH6 Rio Grande 
BentH FremontH Logan *  Routt 
Boulder  Garfield  Mesa  Saguache 
Chaffee  Gilpin  Mineral  San Juan 
CheyenneH Grand  Moffat  San Miguel 
Clear Creek  Gunnison  Montezuma *  Sedgwick * 
Conejos  Hinsdale  Montrose  Summit 
Costilla  HuerfanoLJL1 Morgan  Teller * 
CrowleyH Jackson  OteroH Washington * 
CusterLJL1 Jefferson  Ouray  Weld 
Delta  KiowaH Park  YumaH
Denver  Kit CarsonGAH6 Phillips * 
Map of Colorado
Color Key
Adams Alamosa Arahapoe Archuleta Baca Bent Boulder Chaffee Cheyenne Clear Creek Conejos Costilla Crowley Custer Delta Denver Dolores Douglas Eagle El Paso Elbert Fremont Garfield Gilpin Grand Gunnison Hinsdale Huerfano Jackson Jefferson Kiowa Kit Carson La Plata Lake Larimer Las Animas Lincoln Logan Mesa Mineral Moffat Montezuma Montrose Morgan Otero Ouray Park Phillips Pitkin Prowers Pueblo Rio Blanco Rio Grande Routt Saguache San Juan San Miguel Sedgewick Summit Teller Washington Weld Yuma