California is home to more lizards than almost any other state, and spotting one on a garden fence or hiking trail is practically a rite of passage for anyone who spends time outdoors here. California has more than sixty different species and subspecies of lizards, 15 of which are found in Los Padres National Forest alone. Among the many types of lizards in California, five stand out as the ones residents and hikers encounter most often.
The state is home to a large number of indigenous lizards, including skinks, alligator lizards, night lizards, geckoes, and legless lizards. A wildlife expert at UC Davis has noted that reptile activity “tend[s] to like it during the warmer parts of the year” than the colder months, which explains why sightings spike every spring and summer. This guide covers the five species most likely to cross your path: the western fence lizard, western skink, Sierra alligator lizard, Northern alligator lizard, and horned lizard.
| Lizard | Typical Size | Where to Find It | Quick ID Feature |
|---|---|---|---|
| Western Fence Lizard | 6-9 inches | Statewide except deep desert | Blue patches on belly and throat |
| Western Skink | 2-3.4 inches (body) | Northern, Central, and Southern CA | Dark stripe with white edges, blue tail in juveniles |
| Sierra Alligator Lizard | 2.75-5.5 inches | Sierra Nevada foothills | Distinguished mainly by scale-row count and location |
| Northern Alligator Lizard | 2.75-5.5 inches | North of Monterey Bay and the Sierra Nevada | Keeled scales, prominent skin fold along the side |
| Horned Lizard | 2-6 inches depending on species | Deserts, chaparral, and northern rocky terrain | Spiny “horns” on the head |
1. Western Fence Lizard
If there is one lizard every Californian has seen, it is this one. The most commonly encountered genus of lizards in California is Sceloporus, including the western fence lizard, sometimes commonly called the blue belly lizard, and it is one of the quickest and most easily seen reptiles in the state. Its scientific name, Sceloporus occidentalis, reflects a range that stretches well beyond California’s borders.
The species is native to Arizona, New Mexico, and California, as well as Idaho, Nevada, Oregon, Utah, Washington, and Northern Mexico. Readers curious about how these populations compare across state lines can check out this breakdown of lizards found in Arizona or this guide to lizard species in Mexico, since several fence lizard subspecies cross the border. Because the ventral abdomen of an adult is characteristically blue, the species is also known as the blue-belly.
During its active period from April to October, the western fence lizard frequents rocks, trees, fences, and buildings, growing 6 to 9 inches long with olive, brown, or black coloring marked by paired blotches or wavy cross bars, plus the telltale blue patches on the belly and throat that give it its nickname. California actually hosts five recognized fence lizard subspecies, including the Coast Range, Great Basin, San Joaquin, Northwestern, and Sierra fence lizards, each tied to a specific region of the state. In California, these lizards feed mainly on beetles, ants, wasps, aphids, grasshoppers, and spiders, making them useful allies for gardeners dealing with pest insects. Anyone curious about the arthropods on that menu can browse this list of California beetle species for context. Females lay 3 to 20 cream-colored, soft-shelled eggs in pits of damp soil, and the lizards themselves fall prey to birds, cats, and other predators while basking in the open.
Pro Tip: Western fence lizards are legal to keep as pets in most cases, though wild-caught individuals should be left alone to fill their natural role in the ecosystem. Anyone interested in captive reptiles should first review this guide to popular pet reptile species before bringing one home.
2. Western Skink
Smooth, shiny, and often mistaken for a small snake at a glance, the western skink is a very different animal from the spiny fence lizard sharing its habitat. The species belongs to the genus and species Plestiodon skiltonianus, and while it turns up in Northern California, its largest populations live in Central and Southern California.
Western skinks grow to about 2.1 to 3.4 inches with a 10-year life expectancy, and they have small heads, thick necks, small bodies and legs, and smooth cycloid scales that feel completely different from a fence lizard’s rough, keeled skin. Fence lizards, by comparison, have keeled scales that give the body a prickly appearance and never develop a blue tail. Western skinks carry a dark brown stripe with white edges running from the nose to the base of the tail, a pattern that makes them fairly easy to identify once you know what to look for.
Adult skinks show a distinct blue hue and develop red-orange coloring on the underside during mating season, while juveniles and young adults have conspicuous blue tails that fade with age. One more oddity worth noting: the western skink is one of the few lizard species that guards its eggs after the female lays them. Skinks with similarly glossy scales also show up outside California; readers can compare notes with this guide to lizards native to Hawaii, where several skink species thrive in similar moist habitats. Their smooth skin sometimes leads people to confuse them with amphibians, so it helps to also browse this overview of California salamander species for a side-by-side comparison.
3. Sierra Alligator Lizard
Alligator lizards get their name from a stocky, reptilian look rather than any real connection to alligators, and the Sierra alligator lizard is a mountain-adapted subspecies of the state’s Northern alligator lizard population. Formally known as Elgaria coerulea palmeri, it lives primarily in the Sierra Nevada foothills and surrounding woodlands.
Northern alligator lizards as a group belong to the species Elgaria coerulea, found from Monterey Bay in the north through the Sierra, and they favor oak woodlands, chaparral, and grasslands. The Sierra subspecies is notoriously hard to tell apart from its relatives by sight alone. According to identification guides, the only visual difference between the Sierra alligator lizard and other subspecies is the number of scale rows on the back, so location is the best tool for telling them apart, with coloring that runs brown, gray, or reddish with dark bands and sometimes white spots.
These lizards spend much of their time hunting insects and spiders among leaf litter and rock piles, which makes them a natural check on garden and forest pest populations. For readers interested in what else shares that diet, this list of spiders found in California covers many of the arachnids alligator lizards regularly eat.
4. Northern Alligator Lizard
Stepping back from the Sierra subspecies to the species as a whole, the Northern alligator lizard is one of California’s most recognizable reptiles once you know its distinguishing features. Adults grow to about 2.75 to 5.5 inches and can live for roughly 10 years, considerably longer than many other small lizards in the state.
Northern alligator lizards have slender bodies, short limbs, and long tails, with large, bony scales that are keeled on the back and arranged in 16 rows. A prominent skin fold runs along the side of the body, a feature that separates them from the smoother-scaled skinks discussed earlier. Coloring ranges from brown to grey to olive, marked with dark crossbands and sometimes a middle band down the back.
The species includes four recognized subspecies, each varying slightly in appearance across its range north of Monterey Bay and into the Sierra Nevada. Despite the intimidating name, these lizards are not closely related to alligators and are in fact generally harmless. One especially notable trait sets them apart from most reptiles: female Northern alligator lizards give birth to live young rather than laying eggs, producing as many as 15 offspring at a time. They move with a distinctive snake-like angulation and, like many lizards, can shed their tails to escape a predator’s grip before regrowing them.
Pro Tip: If a lizard bites down and won’t let go, resist the urge to yank it away. Alligator lizards have a strong grip and would rather hold on than risk a tail injury, so gently waiting them out causes far less stress to the animal.
5. Horned Lizard
No list of California lizards is complete without the horned lizard, a group best known for one especially unusual defense trick. The San Diego horned lizard earns its name from the two small horns on its head, and several related species share the same spiky crown across different parts of the state.
The most widespread of these is the coast horned lizard, Phrynosoma blainvillii, which ranges west of the Sierra Nevada and through the deserts, extending north into the Bay Area. Farther north, a smaller relative takes over. The pygmy short-horned lizard is found in northern California in rocky terrain with pockets of fine, loose soil, favoring open plains with sagebrush or open pine forests, and it tolerates colder temperatures better than most other lizards. It can live in mountainous regions at elevations up to 11,000 feet and is almost always found near ant colonies, since ants make up the bulk of its diet.
A single row of fringe scales lines the sides of the body in most horned lizard species, giving them a flattened, camouflaged silhouette against sand and gravel. When threatened, horned lizards rely on more than just camouflage. Like the alligator lizard’s mean bite, the horned lizard has its own trick: it can squirt blood out of its eyes to distract predators. Some horned lizard species, along with the Northern alligator lizard, are also unusual among reptiles in producing live young rather than laying eggs. Horned lizards turn up in other arid states too; readers can compare regional differences in this guide to lizard species found in Texas, where several horned lizard relatives share similar desert habitat.
According to Wikipedia’s compiled range data, California’s horned lizard populations extend from coastal chaparral through desert basins, giving the group one of the broadest habitat tolerances of any lizard family in the state. Anyone spotting one in a desert wash or a foothill trail is looking at an animal built almost entirely around avoiding notice, right up until it decides blood is the better option.
Final Thoughts on California’s Lizard Diversity
From the fence-post regular to the blood-squirting horned lizard, these five species cover a wide range of the reptile life most Californians actually run into. Each fills a slightly different ecological niche, whether that means controlling garden pests, surviving high-elevation cold, or thriving in the driest desert basins the state has to offer.
Learning to tell them apart takes little more than checking scale texture, tail color, and habitat, three clues covered throughout this guide. For readers who want to keep exploring California’s backyard wildlife beyond reptiles, this rundown of bat species found in California makes a fitting next stop, since many of the same chaparral and woodland habitats support both groups.