Species Profile: California Red-Sided Garter Snake

The California red sided garter snake is one of the most visually striking snakes in North America. With its bold combination of electric blue, bright red, and black stripes, this snake looks like it belongs in a tropical rainforest rather than the northern California coast. If you have ever seen one in person, you know that no photograph quite does justice to how vivid their colors really are.

These stunning snakes are a subspecies of the common garter snake, but there is nothing common about their appearance. They are found in a relatively small range along the California coast, and their beauty has made them one of the most sought after garter snakes among reptile enthusiasts.

Identification and Appearance

California red sided garter snakes are medium sized snakes that typically reach 24 to 48 inches in length. Their base color is black with a prominent yellow or cream colored stripe running down the center of the back and a matching stripe along each side. Between these stripes, the black body is marked with vibrant red or orange blotches that can vary in intensity from individual to individual.

What really sets this subspecies apart is the stunning blue or turquoise coloring that appears on the sides and belly, especially in specimens from certain populations. The combination of red, black, blue, and yellow makes this one of the most colorful snakes you will find anywhere. Males tend to be slimmer than females, and females generally grow larger overall.

Baby California red sided garter snakes are born with their characteristic coloring already visible, though the colors tend to become more vivid as they mature. Even as neonates, they are noticeably more colorful than other garter snake subspecies.

Range and Habitat

This subspecies is found along the coast of northern California, primarily from Humboldt County south to the San Francisco Bay Area. Their range is relatively limited compared to other garter snake subspecies, which makes them somewhat special in the herpetology world.

They prefer moist, cool habitats near water sources. You will find them in meadows, marshes, along stream banks, and in coastal scrubland. They are never far from water, as amphibians and fish make up a significant part of their diet. The cool, foggy conditions of the northern California coast suit them perfectly.

During winter, California red sided garter snakes brumate communally. Hundreds and sometimes thousands of individuals gather at traditional hibernation sites, often in rocky outcrops, old foundations, or underground crevices. When they emerge in spring, the mating spectacle that follows is one of the more dramatic events in the snake world, with dozens of males competing for each female.

Diet and Feeding Behavior

California red sided garter snakes are opportunistic feeders with a diverse diet. In the wild, they eat slugs, earthworms, frogs, tadpoles, small fish, salamanders, and occasionally small mice. They are active foragers that hunt during the day, using their keen eyesight and sense of smell to locate prey.

One of the more interesting aspects of their feeding ecology is their resistance to the toxins produced by certain newts. California newts produce tetrodotoxin, one of the most potent natural toxins known. Some populations of California red sided garter snakes have evolved resistance to this toxin, allowing them to eat newts that would kill other predators. This is one of the best known examples of a coevolutionary arms race in nature.

In captivity, they readily accept a diet of earthworms, fish pieces (like tilapia or salmon), and the occasional pinky mouse. Unlike many snake species, garter snakes generally eat frequently and enthusiastically, making feeding time one of the more enjoyable aspects of keeping them.

Behavior and Temperament

Garter snakes in general are active, curious snakes, and the California red sided is no exception. They are diurnal, meaning they are most active during the day, which makes them more fun to observe than nocturnal species. You will often see them basking, exploring their enclosure, or actively hunting for food.

When first captured or acquired, they can be defensive. Their primary defense mechanism is musking, which involves releasing a foul smelling substance from glands near the tail. They may also flatten their body and strike, though their bites are harmless. With regular, gentle handling, most California red sided garter snakes become quite tame and tolerate being held without any fuss.

They are social snakes that can be kept in groups, which is somewhat unusual for snakes. A well set up vivarium with multiple California red sided garter snakes can be a fascinating display as the snakes interact with each other, bask together, and go about their daily activities.

Keeping Them as Pets

California red sided garter snakes can make excellent pets for both beginners and experienced keepers. They are hardy, active, and have a relatively simple care setup compared to many other snake species.

A 20 gallon long enclosure works well for a single adult or a pair. They need a temperature gradient with a basking spot around 85 degrees and a cool side around 70 to 75 degrees. A water bowl large enough to soak in is essential, and they appreciate a substrate that retains some moisture, like coconut fiber or cypress mulch.

Provide plenty of hiding spots and some climbing opportunities. Garter snakes are more active and exploratory than many snake species, so a naturalistic setup with live plants, cork bark, and branches gives them an enriching environment. A secure lid is a must, as these slender snakes are excellent escape artists.

Conservation Status

While common garter snakes as a species are widespread and not threatened, the California red sided subspecies has a limited range. Habitat loss from coastal development, agriculture, and climate change could potentially impact their populations. They are currently protected by California law, and collecting them from the wild is illegal without proper permits.

If you want to keep this subspecies as a pet, purchase captive bred animals from reputable breeders. Captive bred snakes are healthier, better adjusted to captivity, and do not impact wild populations. The captive breeding community for garter snakes is active and growing, so finding captive bred California red sided garter snakes is easier than it used to be.