Red Diamond Rattlesnake

The red diamond rattlesnake is a species of venomous pit viper found in southwestern California of the United States and Baja California in Mexico. Other common names of the big, heavy-bodied snake include red rattlesnake, red diamond-backed rattlesnake, red diamond snake, western diamond rattlesnake, and red rattler.

Scientific Classifications

Conservation Status

Not EvaluatedNE

Not Evaluated

Data DeficientDD

Data Deficient

Least ConcernLC

Least Concern

Near ThreatenedNT

Near Threatened





Critically EndangeredCR

Critically Endangered

Extinct in the wildEW

Extinct in the wild




This snake has three recognized subspecies.

  • Cedros Island red diamond rattlesnake (Crotalus ruber exsul)
  • San Lucan red diamond rattlesnake (Crotalus ruber lucasensis)
  • Red diamond rattlesnake (Crotalus ruber ruber)


Red Diamond Snake


The size of the red rattlesnake exceeds 39 in (100 cm) on the mainland. Large males can exceed 55 in (140 cm) in length. However, individuals above 59 in (150 cm) are pretty rare. The largest recorded size of the species is 64 in (162 cm). The snakes found in the coastal regions are longer on average than those in the desert regions.

Color and Appearance

Red Diamondback Rattlesnake

The reddish color of the body has earned the viper the specific name, ruber – the Latin word for red. It has a diamond-shaped pattern running along the middle of its back. Each diamond marking has light edges. A pair of anterior chin shields is formed by a transversal division of the first lower labial scale on each side. The dorsal scales are generally arranged in 29 rows but may vary between 25 and 31 rows.

The babies resemble the adults in their looks, but their bodies may be lighter shades of brown or tan than red.

Are They Dangerous to Humans 

Red Diamond Rattlesnake Picture

The relatively mild-mannered, secretive snake rarely bites humans. If cornered, it puts its defense tactics like rattling, coiling, and striking into play. It only bites when stepped upon, handled, or startled.

The red diamond snake has a mild venom that is the least potent of all rattlesnake venoms. Still, its bite is a medical emergency and can be fatal if prompt antivenom treatment is not done. The bite symptoms include pain, massive tissue swelling, hemorrhagic blebs, ecchymosis, and necrosis. Systemic symptoms may include vomiting, nausea, clinical bleeding, coagulopathy, and hemolysis.

Red Diamond Rattlesnakes at a Glance


Red Diamond Rattlesnake Range

They live in the United States in southwestern California, southward through the Baja California peninsula. But their range doesn’t include the desert east of the Sierra de Juárez in northeastern Baja California.

They are also found in several islands in the Gulf of California, including San Lorenzo del Sur, Angel de la Guarda, San Marcos, Pond, Monserrate, Danzante, and San José. Off the west coast of Baja California, they inhabit Isla de Santa Margarita, which is off Baja California Sur, and Isla de Cedros.


Red Diamond Rattlesnake Habitat

The red diamond-backed rattlesnake prefers the dense chaparral regions of the foothills, boulders covered with brush, and cactus patches, from sea level to an elevation of 1,500 m. They are found in the cooler coastal zones, over the mountains, and into the deserts beyond.


It lives for around 13-15 years.

Crotalus ruber


Its predators are roadrunners, kingsnakes, and possibly owls.


Ground squirrels, rabbits, lizards, birds, and other snakes form this ambush predator’s prey.


Ovoviviparous (gives birth to live young from eggs that hatch inside the body)

After mating between February and April, the females give birth to 3-20 young in August. The neonates are 30-34 cm long.

Similar Species

Western Diamond-backed Rattlesnake

The western diamond-backed rattlesnake (Crotalus atrox) has distinct dark spots on the dorsal diamond-shaped pattern. In contrast, the red diamondback rattlesnake has faint or no dark spots on the dorsal diamond markings.


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