Photo credit:

Johnathan Bolton

Common name

Eastern Black-Tailed Rattlesnake

Scientific name

Crotalus ornatus

Conservation Status

Least Concern

Federal and State Protections


Countries of Occurrence

United States of America, Mexico

States or Providence 

Texas (USA); Chihuahua, Nuevo León (MX)


Adult size

70– 100 cm, rarely to 130 cm SVL*

Species Description

Eastern Black-tailed Rattlesnakes may be gray, olive or tan, with dark gray, brown or black rhombic patterns. As the name suggests, this species has a distinct black tail often lacking any visible banding.

The Eastern Black-tailed Rattlesnake was recognized as a separate species distinct from the Black-tailed Rattlesnake (Crotalus molossus ssp.) in 2012. The two species can best be distinguished by geographic range.

Jacksonville, FL |  |  1-800-690-5638

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