Scorpions in the United States are overwhelmingly concentrated in the arid Southwest, with Arizona serving as the undisputed epicenter. Roughly 90 or more species have been documented across the country, but the vast majority live in a belt stretching from southern California through Arizona, New Mexico, and into western Texas. That said, scorpions are not strictly a desert phenomenon. Scattered populations turn up in surprising places, from the humid forests of the Carolinas to the scrublands of southern Oregon, and understanding their full range matters whether you are planning a move, hiking in unfamiliar terrain, or just wondering what might be hiding under that rock in your backyard.
Arizona and the Sonoran Desert
If any single state could be called scorpion headquarters, it is Arizona. The Sonoran Desert, which blankets most of the state’s southern half and spills into southeastern California and the northwest corner of Mexico, supports a remarkable diversity of scorpion species. Giant hairy scorpions, stripe-tailed scorpions, and several species of the genus Vaejovis all thrive in the rocky, sun-baked terrain. But the species that draws the most attention is the Arizona bark scorpion, Centruroides sculpturatus. This is the only scorpion in the United States considered medically significant to healthy adults, and it is common in the greater Phoenix and Tucson metropolitan areas, not just in remote desert. Bark scorpions are small, straw-colored, and excellent climbers. They turn up inside homes, in shoes, on walls, and on ceilings far more readily than the larger, ground-dwelling species.
The concentration around Phoenix is not just about the desert climate. Urban development in the Valley of the Sun pushed into prime bark scorpion habitat, and the irrigated landscaping that followed actually created microhabitats with moisture and insect prey. Older neighborhoods built on previously undisturbed desert tend to have higher scorpion activity than newer subdivisions where the land was scraped and graded, though even new construction is not immune. Tucson, Scottsdale, Mesa, and the communities running along the Salt River Valley are all well within the bark scorpion’s core range.
Beyond the urban fringe, Arizona’s montane “sky islands,” the isolated mountain ranges rising from the desert floor, harbor their own distinct scorpion fauna. Research on the Vaejovis vorhiesi group, a cluster of montane scorpion species found across the highlands of southern Arizona and adjacent New Mexico, has revealed 27 geographically distinct lineages. Most of these lineages diverged millions of years ago, during the Miocene and Pliocene epochs, well before the ice ages began, suggesting that these scorpion populations have been isolated on their respective mountain ranges for an extraordinarily long time.1PubMed Central. As Old as the Hills: Montane Scorpions in Southwestern North America Reveal Ancient Associations between Biotic Diversification and Landscape History That kind of deep evolutionary history means Arizona’s scorpion diversity is not accidental. The landscape itself has been shaping distinct species for millions of years.
Southern California, Nevada, and Utah
The Mojave Desert, stretching across southeastern California and southern Nevada, is the second major hotspot. Las Vegas sits squarely in scorpion territory, and residents of Henderson, North Las Vegas, and the suburbs pushing into the surrounding desert encounter bark scorpions and desert hairy scorpions regularly. The Coachella Valley and the communities around Palm Springs in California deal with similar species. Further north in California, scorpion encounters drop off, though populations of Paruroctonus species extend into the Central Valley and parts of the Coast Ranges.
Southern Utah, particularly the red-rock country around St. George and the canyonlands to the east, falls within the range of several species. The bark scorpion’s range extends into the southwestern corner of Utah, making it one of the northernmost places in the country where that particular species shows up. The Colorado Plateau, with its dry heat and abundant rock crevices, provides ideal scorpion microhabitats even at elevations well above the low desert.
Texas and the Southern Plains
Texas hosts a wide variety of scorpions, with the striped bark scorpion, Centruroides vittatus, being the most commonly encountered species statewide. Unlike the Arizona bark scorpion, the striped bark scorpion is not considered dangerous to healthy adults, though its sting is painful. Its range covers most of Texas and extends into Oklahoma, Kansas, Arkansas, and even parts of Missouri and Louisiana. This makes it the most geographically widespread scorpion species in the United States.
The Big Bend region of far west Texas, where the Chihuahuan Desert dominates the landscape, harbors a richer mix of species, including some that are closely related to Mexican species and found nowhere else in the country. The Trans-Pecos area is particularly productive for scorpion diversity. Moving east across the state, species diversity drops, but C. vittatus persists well into the humid eastern half of Texas. You can find scorpions under rocks and inside houses in the Hill Country around Austin and San Antonio, through the Blackland Prairie, and south into the brushlands of the Rio Grande Valley.
The Oklahoma and Kansas populations represent the northern edge of this central range. Encounters in those states are most common in the south, particularly where rocky outcrops and wooded hillsides provide shelter. By the time you reach Nebraska, scorpions are essentially absent.
The Southeast and the Eastern Fringe
Scorpions are not confined to the dry West. Several species live across the southeastern United States, though they are less commonly encountered and far less diverse than in the Southwest. The most widespread eastern species is the southern devil scorpion, Vaejovis carolinianus (sometimes placed in the genus Diplocentrus by some taxonomists), which ranges from Virginia through the Carolinas, Georgia, Alabama, Mississippi, and into parts of Tennessee and Kentucky. This small, dark scorpion lives in leaf litter, under bark, and beneath stones in forested habitats. It is so unobtrusive that many people living within its range have no idea scorpions exist in their state.
Florida adds another layer. The Florida bark scorpion, Centruroides gracilis, and the Hentz striped scorpion, Centruroides hentzi, are both present in the state, with C. gracilis established primarily in southern Florida, likely via introduction from the Caribbean. These are mild-stinging species, and Florida’s warm, humid climate supports populations in suburban areas, particularly around Miami-Dade County and the Keys.
The key difference between the eastern and western scorpion zones is density and diversity. A person in the Appalachian foothills of North Carolina might go years without seeing a scorpion despite living within V. carolinianus‘s range. A person in the Sonoran Desert can flip a single rock and find three.
How Far North Do Scorpions Reach?
The most northerly scorpion populations in the United States are found in the Pacific Northwest and the northern Rockies. Paruroctonus boreus, commonly called the northern scorpion, lives in dry grasslands and sagebrush habitats of eastern Oregon, eastern Washington, Idaho, Montana, and parts of Wyoming and the Dakotas. It even crosses into southern Canada in parts of British Columbia and Alberta, making it one of the highest-latitude scorpion species on Earth.
These northern scorpions survive by burrowing into soil to escape winter temperatures and entering a dormant state during the coldest months. They are small, inconspicuous, and rarely encountered by people. Their preferred habitat, open dry rangeland, does not overlap much with heavily populated areas in those states. Someone living in Boise or Billings might technically share their county with scorpions and never know it.
The Great Lakes region and the Northeast are the main parts of the contiguous United States that are genuinely scorpion-free. Cold winters, heavy snowfall, and humid forest soils make the Upper Midwest, New England, and the mid-Atlantic states inhospitable. There are no established outdoor populations in New York, Michigan, Ohio, Pennsylvania, or anywhere in that corridor.
What Draws Scorpions to Specific Spots
Scorpions are not randomly scattered across a climate zone. Within any given region, they cluster in microhabitats that offer three things: shelter from temperature extremes, access to prey, and low moisture. Rock piles, fallen timber, loose bark, pack-rat middens, and the gaps beneath concrete slabs all serve as daytime retreats. At night, scorpions emerge to hunt insects, spiders, and other small arthropods.
Elevation plays a surprising role. While low-desert habitats get most of the attention, many scorpion species in the Southwest thrive at mid-elevations, in the 4,000 to 7,000 foot range, where rocky slopes, scattered oaks, and cooler nights create conditions that some species actually prefer over the extreme heat of the valley floor. The sky-island diversification pattern documented in Arizona’s Vaejovis scorpions reflects this: mountain-dwelling species have speciated in place on isolated peaks, separated from one another by stretches of low desert they rarely cross.1PubMed Central. As Old as the Hills: Montane Scorpions in Southwestern North America Reveal Ancient Associations between Biotic Diversification and Landscape History
In urban settings, certain features reliably attract scorpions. Decorative rock landscaping, block-wall fences, palm trees with loose bark, and ground-level entry points into homes all increase the odds of encounters. Ironically, irrigated yards in the desert can draw more scorpions than bare desert, because the water attracts the crickets and roaches that scorpions eat.
Finding Scorpions at Night
One of the most distinctive features of scorpions is that their exoskeleton fluoresces under ultraviolet light, glowing a vivid blue-green. This trait makes UV flashlights the single most effective tool for finding scorpions after dark, whether for research surveys or for homeowners checking their property. Traditionally, researchers used portable fluorescent tube lamps, but modern LED-based UV lights have transformed the process. An LED array designed for scorpion detection produces fluorescence roughly 13 times brighter than older fluorescent tube lamps drawing the same battery power, while being cheaper, lighter, and more durable.2Euscorpius. A powerful new light source for ultraviolet detection of scorpions in the field
This technology is not just for scientists. Inexpensive UV flashlights are widely sold for exactly this purpose in hardware stores across the Southwest. Walking your yard or the perimeter of your home on a warm evening with one of these lights will reveal scorpions you would never spot by eye. The fluorescence works on all scorpion species found in the United States, and even on shed exoskeletons and dead specimens, so you can use it to identify where scorpions are sheltering even if they are not active when you look.
Living in Scorpion Territory
For people who live in or move to scorpion-rich areas, a few practical realities matter more than the species-level map. First, bark scorpions are climbers. Most other scorpion species in the United States are strictly ground-dwellers and unlikely to end up in your bed or on a high shelf. But bark scorpions routinely climb walls, get into attics, and walk across ceilings. If you are in the range of Centruroides sculpturatus, primarily Arizona, southeast California, southern Nevada, and southwest Utah, you need to think about vertical entry points, not just ground-level ones.
Sealing your home makes a genuine difference. Weather stripping under doors, caulking gaps around pipes and utility lines, and fixing torn window screens collectively reduce indoor encounters. Removing harborage near the foundation, such as stacked firewood, piles of bricks, or ground-covering vegetation right against the house, helps too. Sticky traps placed along interior walls catch scorpions that do get inside and give you a sense of which rooms are most affected.
Stings from most U.S. scorpion species are roughly comparable to a bee sting: painful, sometimes swollen, but not dangerous. The Arizona bark scorpion is the exception. Its sting can cause numbness, tingling that spreads from the sting site, muscle twitching, and in rare cases, especially in young children or the elderly, more serious systemic symptoms. If a child is stung by a bark scorpion, calling poison control or seeking medical attention promptly is the right move. An antivenom exists and is stocked by hospitals in the species’ range.
Scorpions and Their Predators
Scorpions sit in the middle of the food web, not at the top. A surprising array of animals eat them, including owls, shrews, lizards, tarantulas, and several bat species. The pallid bat, found across much of the western United States, is a specialist ground-gleaner that regularly hunts scorpions, including the Arizona bark scorpion. Research has shown that pallid bats shrug off bark scorpion stings that would be dangerous to a similarly sized mammal. In controlled tests, bats injected with venom at concentrations lethal to mice showed no changes in behavior, and even at concentrations nearly seven times the mouse lethal dose, most bats were unaffected.3PubMed Central. Arizona bark scorpion venom resistance in the pallid bat, Antrozous pallidus
Grasshopper mice, another well-known scorpion predator in the Southwest, have independently evolved a similar resistance. These mice attack bark scorpions head-on and consume them routinely. The existence of multiple predators with venom resistance tells you something about how abundant and ecologically important scorpions are in these desert communities. They are not a marginal presence; they are a staple food source.
Why Some States Have None
The absence of scorpions from the northern and northeastern United States is driven primarily by winter conditions. Scorpions are ectotherms, and while some species tolerate cold surprisingly well by burrowing and entering dormancy, there is a threshold below which survival becomes impossible. Extended hard freezes, deep snow cover, and saturated soils eliminate the dry, rocky microhabitats scorpions need. The northern scorpion, P. boreus, gets around this in the northern Rockies by living in well-drained, sandy soils where it can burrow below the frost line, but the clay-heavy, wet soils of the Midwest and the prolonged deep freezes of the Great Lakes region are a different story.
Humidity matters independently of temperature. The heavily forested, high-rainfall zones of the Pacific Northwest coast, despite their relatively mild winters, do not support scorpion populations. Scorpions lose water through their exoskeleton, and persistently wet conditions promote fungal infections and limit the dry retreats they depend on. This is why scorpions hug the eastern side of the Cascades in Oregon and Washington rather than colonizing the lush western slopes.
For anyone wondering whether climate change might push scorpions into new areas, the short answer is that it is plausible for some borderline zones. Warming winters could allow species at the edge of their range to persist slightly farther north or at slightly higher elevations. But scorpions reproduce slowly and disperse on foot, so range shifts happen over generations, not years. The map of scorpion hotspots in the United States today looks much the same as it did a few decades ago, and the core pattern, dominated by the arid Southwest, is unlikely to change in any dramatic way within a human lifetime.