Are There Scorpions in Texas? What to Know

Texas is home to roughly 20 species of scorpion, making it one of the most scorpion-rich states in the country. The striped bark scorpion, Centruroides vittatus, is by far the most common and the one you are most likely to find in your garage, your boot, or clinging to the side of your house at night. While a sting from this species is painful, it is almost never dangerous to healthy adults. The rest of the story involves where these animals live, what they eat, how to keep them outside, and a few biological quirks that make scorpions genuinely strange.

Which Species Live in Texas

The striped bark scorpion dominates the state. It ranges from deep South Texas brushland all the way north into Oklahoma, and from the arid Trans-Pecos west to the humid eastern edge of the Edwards Plateau. Research in the Tamaulipan brushland of South Texas has tracked C. vittatus populations across multiple habitat types, finding that their density varies with vegetation but that they show up in essentially every landscape tested, from dense blackbrush to open rangeland.¹ A second species commonly documented alongside it in South Texas is Vaejovis waueri, a smaller, ground-dwelling scorpion less often encountered indoors.

Beyond those two, Texas hosts species from several other families. The Trans-Pecos region, with its rocky canyons and sky islands, has the greatest diversity and includes montane scorpions whose lineages trace back roughly 20 million years to the Neogene period, long before the Pleistocene ice ages.² And beneath the Edwards Plateau, the extensive karst cave systems harbor Pseudouroctonus reddelli, a cave-adapted scorpion found nowhere else. Genetic work on this species suggests the caves themselves acted as climate refuges during glacial periods, allowing isolated populations to persist and diversify.³ These cave scorpions are pale, have reduced eyes, and are of essentially zero concern to homeowners, but they are a reminder of how much scorpion diversity sits beneath the surface of the state.

Where You Are Most Likely to Encounter Them

If you live anywhere in the western two-thirds of Texas, scorpions are your neighbors. The Hill Country, the Trans-Pecos, and the South Texas brushlands all have high densities. Cities like Austin, San Antonio, and El Paso are well within scorpion territory, and suburban development has not meaningfully reduced encounters. In fact, construction that creates rubble, stone landscaping, and unfinished masonry often gives scorpions new hiding spots close to people.

Central and East Texas see fewer scorpions, and the humid Gulf Coast is less hospitable to most species, but C. vittatus still turns up in surprising places, including occasionally in the Houston and Dallas-Fort Worth metro areas. The species is a habitat generalist. A ten-year field study in South Texas found striped bark scorpions foraging on vegetation, on the ground, and on structures in every month of the year, though activity peaks in the warmer months from late spring through early fall.⁴

Younger scorpions and adults use different microhabitats. Smaller individuals tend to be found on vegetation at higher rates, while large adults split their time more evenly between the ground and plant surfaces.⁵ This matters for homeowners because it means scorpions of all sizes are climbing. They are not just crawling along the ground; they are moving up walls, tree trunks, and fence posts.

What Texas Scorpions Eat

The diet of C. vittatus is more varied than most people assume. A decade of field observations in blackbrush habitat showed that caterpillars were the primary prey across all seasons and all size classes of scorpion.⁴ That is not what most people picture. These scorpions spend a great deal of time up in shrubs and low trees, sitting in wait for moths and caterpillars moving along branches. In detailed observations, over 99% of scorpions found with caterpillar prey were on vegetation rather than on the ground.⁶

Larger scorpions branch out. They take more grasshoppers and crickets, and they are more likely to engage in intraguild predation, meaning they eat other scorpions. This cannibalistic behavior is more common in the fall and early winter months.⁴ Medium-sized scorpions, interestingly, are the most efficient caterpillar hunters, capturing more of them during the cooler months of January through April when they actively forage higher in vegetation. The picture that emerges is of an animal that switches between sit-and-wait ambush tactics and active searching depending on its size and the season.

How Dangerous a Sting Actually Is

A sting from the striped bark scorpion hurts. Most people describe it as a sharp, burning pain that radiates from the sting site, often accompanied by numbness or tingling. For the vast majority of adults, that is as bad as it gets. The pain fades over a few hours, and the numbness can linger for a day or two. No antivenoms are marketed for C. vittatus specifically, and standard treatment is pain management and monitoring.

The real concern is with very young children. Clinical reviews note that scorpion envenomation in children under five can, in rare cases, lead to more serious systemic effects including cardiovascular complications.⁷ These cases are uncommon with Texas species, but they are the reason pediatric stings warrant a call to poison control or a trip to urgent care. For adults, the main risk beyond pain is an allergic reaction. Research has identified allergens in C. vittatus venom that are distinct from the neurotoxins responsible for the sting’s pain, meaning a person can develop an immune-mediated hypersensitivity reaction on top of the direct toxicity.⁸

The distinction between venom toxicity and an allergic reaction matters for treatment. Toxicity from a sting typically shows up as localized pain, tingling, and mild swelling. An allergic reaction looks different: hives, itching, more significant swelling, and in severe cases, the kind of full-body anaphylactic response you would associate with a bee sting allergy.⁷ If you have been stung before and your next sting produces widespread skin reactions or difficulty breathing, that is a medical emergency, not just a painful nuisance. People who know they have had allergic reactions to stings in the past should discuss this with an allergist.

It is worth noting that Texas does not have the Arizona bark scorpion (Centruroides sculpturatus), which is responsible for the most medically significant scorpion stings in the United States. The Texas species are painful but much less dangerous.

How They Survive the Heat (and the Cold)

Scorpions are ectotherms, so their body temperature matches their environment. For C. vittatus, temperature creates a tradeoff. Warmer body temperatures allow faster sprinting and quicker stinging, both of which help the animal escape predators and subdue prey. But higher temperatures also increase water loss, a serious problem in the arid environments where most Texas scorpions live.⁹ The solution is behavioral. When actively foraging or exposed to predators, bark scorpions prefer warmer spots where they can react quickly. When resting during the day, they tuck into cooler, more humid hiding places, which slows their metabolism and reduces water loss.

This behavioral thermoregulation explains a lot about when and where you find scorpions. They emerge at night partly because the cooler air allows them to be active without drying out as fast, and they retreat to cracks, bark gaps, and the dark undersides of objects during the day. For homeowners, this means that anything providing a cool, tight gap during daylight hours is attractive to scorpions: stacked firewood, piled lumber, loose bark, stone walls, and the weep holes in brick exteriors.

The Fluorescence Mystery

If you have ever swept a UV flashlight across your yard at night, you know that scorpions glow an eerie blue-green. Every scorpion species does this, and the effect comes from compounds in the outer layer of their exoskeleton. What scientists have debated for years is why. One compelling hypothesis tested on C. vittatus and related species is that the fluorescence is not decorative or coincidental. Instead, the entire exoskeleton may function as a whole-body light detector, converting UV light into a wavelength the scorpion’s nervous system can sense.¹⁰

Experimental work supports this idea. When researchers compared fluorescent scorpions to ones whose fluorescence had been blocked, the fluorescent animals showed reduced activity and more variable shelter-seeking behavior under UV light, suggesting they were actively detecting and responding to UV exposure.¹¹ The practical implication is that scorpions may use their glow as an early warning system. Even moonlight contains UV, and a scorpion that can detect it using its entire body surface could judge how exposed it is and retreat to cover. This is a plausible explanation for why scorpions are so effective at finding and hiding in the darkest available crevice.

For anyone trying to find scorpions around their property, UV flashlights remain the single most effective detection tool. A cheap blacklight flashlight will make every scorpion within sight range pop against the ground, walls, or vegetation. Even freshly molted scorpions, which are temporarily less fluorescent, will still glow faintly.

Keeping Scorpions Out of Your Home

Scorpion exclusion is more about physical barriers than chemical treatments. Pesticides can reduce populations to some degree, but the animal’s hard exoskeleton and low metabolic rate mean it can survive exposures that would kill many other arthropods. Exclusion, meaning sealing the building envelope, is consistently more effective than spraying.

A thorough review of bark scorpion management recommends a combination of approaches:¹²

Seal entry points: Install screens on windows, drains, weep holes, and ventilation openings. Use weatherstripping or door sweeps to close gaps under exterior doors. Caulk or plaster cracks in the foundation and walls.
Manage landscaping: Trim any vegetation that touches walls or the roofline. Avoid bark chips and large decorative rocks near the foundation, as both create ideal hiding spots.
Exploit their climbing weakness: Scorpions cannot climb smooth surfaces like glazed tile, smooth plastic, or metal sheeting. Specialized exclusion paints that create a slick, glass-like finish on walls and foundations have been developed and tested. In controlled evaluations, bark scorpions were unable to climb vertical surfaces or even narrow horizontal bands treated with these products.

Inside the house, the most effective prevention is simple tidiness. Shake out shoes and clothing left on the floor. Move beds away from walls. Check bedding before climbing in, especially in rooms at ground level. Sticky traps placed along baseboards can catch scorpions that do get inside and also give you a sense of how many are making it through your defenses.

Scorpions in the Food Web

Scorpions occupy a middle tier in Texas ecosystems. They are predators of insects and other small invertebrates, and prey for a surprising array of animals. Owls, roadrunners, lizards, tarantulas, and some snakes all eat scorpions. But the most remarkable scorpion predator in Texas is the grasshopper mouse.

Grasshopper mice (Onychomys species) routinely attack and eat bark scorpions, and researchers have spent years figuring out how they tolerate the venom. The answer turns out to be evolutionary. In most mammals, bark scorpion toxins activate a specific sodium channel in nerve cells that sends pain signals to the brain. Grasshopper mice carry genetic variants in a different sodium channel that actually bind the scorpion toxins and block pain signal transmission entirely, turning the venom into its own painkiller.¹³ It is one of the more elegant examples of an evolutionary arms race playing out in real time.

Toxicity testing across multiple grasshopper mouse populations showed that all populations had venom resistance greater than that of typical lab mice, and the degree of resistance tracked with whether the mouse population lived alongside bark scorpions or not. Populations sharing territory with scorpions were more resistant, consistent with the idea that natural selection has been actively shaping this trait.¹⁴ This kind of geographic variation in resistance is a strong signal that the arms race between predator and prey is ongoing.

What to Do If You Get Stung

Most Texas scorpion stings can be managed at home. Wash the area with soap and water, apply a cool compress to reduce pain, and take an over-the-counter pain reliever if needed. Avoid applying ice directly to the skin for extended periods. The pain typically peaks within the first couple of hours and subsides over the next several.

Call poison control (1-800-222-1222) or seek medical attention if:

The person stung is a young child: Children under five are at higher risk for systemic effects and should be evaluated.
Symptoms spread beyond the sting site: Muscle twitching, difficulty swallowing, blurred vision, or drooling suggest a more significant envenomation.
Allergic symptoms appear: Hives, widespread itching, facial swelling, or trouble breathing point to a hypersensitivity reaction rather than simple venom toxicity, and that distinction changes the treatment.⁷

The vast majority of stings from Texas species resolve without medical intervention. If you are stung repeatedly over the years and notice your reactions getting worse rather than better, that pattern suggests sensitization to venom allergens and is worth discussing with a doctor. The allergens in C. vittatus venom are different from the neurotoxins, so someone can develop increasing allergic sensitivity even though the venom’s direct toxicity has not changed.⁸

Ancient Residents, Not Recent Invaders

People sometimes talk about scorpions in Texas as though they are creeping in from somewhere else, expanding their range with warming temperatures or hitching rides in shipping containers. The reality is that scorpions have been in Texas for a very long time. The montane species of the Trans-Pecos region, for instance, began diversifying around 20 million years ago, with most splits between species happening well before the ice ages.² The cave scorpion P. reddelli has been diversifying underground across the Edwards Plateau for a comparable stretch of geological time, with individual cave populations becoming genetically distinct from one another as they were isolated by changing landscapes.³

These animals are deeply embedded in the ecology of the state. The striped bark scorpion, as a generalist predator active year-round, plays a meaningful role in controlling insect populations, particularly caterpillars and grasshoppers. The species is also food for native predators from elf owls to grasshopper mice, and removing it from the system would ripple through multiple trophic levels. Whether you find them charming or alarming, scorpions are a native and long-established part of what makes Texas ecosystems work.

1
Research Information Online (RIO), Texas A&M International University. HABITAT EFFECTS ON SCORPION DENSITIES AND MICROHABITAT USE BY CENTRUROIDES VITTATUS AND VAEJOVIS WAUERI IN SOUTH TEXAS
2
PLoS ONE. As Old as the Hills: Montane Scorpions in Southwestern North America Reveal Ancient Associations between Biotic Diversification and Landscape History
3
PubMed Central. Caves as microrefugia: Pleistocene phylogeography of the troglophilic North American scorpion Pseudouroctonus reddelli
4
Euscorpius. Effect of seasons and scorpion size on the foraging and diet of the striped bark scorpion, Centruroides vittatus (Buthidae: Scorpiones) in blackbrush habitat of south Texas
5
Research Information Online (RIO), Texas A&M International University. A Comparative Study of the Microhabitat Selection of the Scorpion Centruroides vittatus in the Tamaulipan Biotic Region of South Texas
6
The Journal of Arachnology. The effect of microhabitat use on the foraging and diet of the striped bark scorpion, Centruroides vittatus (Buthidae: Scorpiones) in blackbrush habitat of south Texas
7
PubMed Central. Scorpion sting and allergic reaction to scorpion venom: A case-based review
8
PubMed. Identification of allergens in the venom of the common striped scorpion
9
The Journal of Arachnology. Temperature and desiccation effects on the antipredator behavior of Centruroides vittatus (Scorpiones: Buthidae)
10
Animal Behaviour. Scorpion fluorescence and reaction to light
11
The Journal of Arachnology. Ultraviolet light detection: a function of scorpion fluorescence
12
Journal of Integrated Pest Management. Distribution, biology, and management of medically relevant bark scorpions, with emphasis on Centruroides sculpturatus (Scorpiones: Buthidae)
13
PubMed Central. Voltage-gated sodium channel in grasshopper mice defends against bark scorpion toxin
14
PubMed. Physiological resistance of grasshopper mice (Onychomys spp.) to Arizona bark scorpion (Centruroides exilicauda) venom