California rattlesnake species include the northern Pacific rattlesnake (in northern California), and the Western Diamondback, Sidewinder, Speckled rattlesnake, Red Diamond rattlesnake, Southern Pacific, Great Basin rattlesnake and the Mojave rattlesnake (all found in Southern California). It is a pit viper, and it seeks out prey by using a heat-sensing organ that can be found on both sides of the snake’s face between the nostrils and the eye. The rattlesnake is a highly venomous snake. That made me wonder, when is rattlesnake season in Southern California? Their venom is highly toxic to humans and occasionally fatal; however, they strike humans only if cornered or threatened. into California from elsewhere.) Southern Pacific Rattlesnakes can be found throughout California, including the St. Francis Dam site. This snake is actually a subspecies of species Crotalus viridis. The rattlesnake is a highly venomous snake. Southern Pacific Rattlesnake Coiled against a Log. The Southern Pacific Rattlesnakes range is from coastal Southern California to northwestern Baja California, Mexico, and they are commonly found on prairies or sage scrub/grassland areas, especially near rocky outcroppings. Like the red diamondback, the southern Pacific rattlesnake feeds mainly on reptiles and mammals, as well as birds. There are three main species of rattlesnake in coastal Southern California: the Western Rattlesnake, the Western Diamondback Rattlesnake, and the Mojave Rattlesnake. Southern Pacific Rattlesnake - Crotalus viridis helleri. So, I did some research on the subject and this is what I found out. Juvenile Northern Pacific rattlesnake, Sacramento County, California The color pattern of the typical form, C. o. oreganus , has a dark-brown, dark-gray, olive-brown, or sometimes black or pale yellowish ground color overlaid dorsally with a series of large, dark blotches with uneven white edges. These are some of the most common myths, broken down. There are three main species of rattlesnake in coastal Southern California: the Western Rattlesnake, the Western Diamondback Rattlesnake, and the Mojave Rattlesnake. It is a pit viper, and it seeks out prey by using a heat-sensing organ that can be found on both sides of the snake’s face between the nostrils and the eye. California rattlesnake species include the northern Pacific rattlesnake in northern California, and the Western Diamondback, Sidewinder, Speckled rattlesnake, Red Diamond rattlesnake, Southern Pacific, Great Basin rattlesnake and the Mojave rattlesnake which are all found in Southern California. Starting each spring, Southern Pacific rattlesnakes (Crotalus oreganus helleri), the most common species in the L.A. area, come out of hibernation to mate. The California venomous snake list includes the western rattlesnake, western diamondback rattlesnake, red diamond rattlesnake, sidewinder, southwestern speckled rattlesnake and … These are some of the most common myths, broken down. Rattlesnakes are part of life in Southern California, but there are a lot of misconceptions about our slithering friends. Between the three, the Western Diamondback is generally considered the most aggressive. Between the three, the Western Diamondback is generally considered the most aggressive.