San Antonio is home to scorpions, and if you’ve spotted one in your house or yard, you’re not alone. The most common species in the area is the striped bark scorpion, a small, pale-yellow arachnid that thrives in the hot, dry conditions of Central Texas. The good news: scorpion stings in the U.S. are painful but rarely life-threatening for healthy adults. The not-so-good news: these creatures are persistent home invaders, especially during the summer months.
Species You’re Likely to Find
The striped bark scorpion is by far the most frequently encountered species in the San Antonio region. Adults range from about 1.6 to 3 inches long, including their curved, segmented tail. They’re typically straw-colored or light tan with two dark stripes running down their back, though coloring can vary. They’re nocturnal, hiding during the day under rocks, woodpiles, loose bark, and debris, then emerging at night to hunt insects.
Bark scorpions are the only scorpion species in the United States with venom potent enough to cause serious symptoms. Worldwide, roughly 100 out of more than 2,000 scorpion species produce venom that can be fatal. That said, very few deaths from scorpion stings have been reported in the U.S., and the San Antonio-area striped bark scorpion is far less dangerous than its Arizona cousin, the Arizona bark scorpion. For a healthy adult, a sting is comparable to a wasp sting: intensely painful, but manageable.
When Scorpions Are Most Active
Peak scorpion season in Texas runs from July through August, when temperatures are highest and scorpions are most actively hunting and mating. But they’re present year-round. During the hottest stretches of summer, scorpions often move indoors to escape the heat, which is why many San Antonio homeowners first discover them inside the house during triple-digit weeks.
Warm, dry evenings are prime time. Scorpions are almost exclusively nocturnal, so you’re unlikely to see one out during the day unless you disturb its hiding spot. If you want to check your yard for scorpions, a UV blacklight flashlight is the most effective tool. Scorpions glow a bright blue-green under ultraviolet light, making them easy to spot at night against dark soil, concrete, or walls.
What a Sting Feels Like
A striped bark scorpion sting typically causes immediate, sharp pain at the site, along with numbness, tingling, slight swelling, and warmth. For most adults, the discomfort peaks within the first hour or two and then gradually subsides. The pain can be intense, but it usually resolves without medical treatment.
More serious reactions can affect the whole body. These include muscle twitching or jerking, trouble breathing, drooling, sweating, nausea, vomiting, slurred speech, fast heart rate, and high blood pressure. Young children and older adults face the highest risk of severe complications, including heart or lung failure in rare, untreated cases. Children who are stung may cry inconsolably and show unusual movements of the head, neck, or eyes.
Allergic reactions are another concern. Even if a previous sting caused only mild symptoms, a future sting can trigger anaphylaxis, a severe, life-threatening allergic response involving hives, difficulty breathing, and vomiting. This requires emergency care.
First Aid for a Sting
If a scorpion stings you, clean the wound with mild soap and water and apply a cool compress. An over-the-counter pain reliever like ibuprofen can help manage pain. Try to keep the affected area still rather than moving it around. Check that your tetanus vaccination is up to date.
If a child is stung, contact Poison Help at 800-222-1222 right away, even before symptoms develop. Children react more unpredictably, and the poison control center can help you decide whether emergency care is needed. For adults or children showing severe symptoms (trouble breathing, muscle spasms, slurred speech), get to an emergency room. An antivenom exists and can be given in cases of serious reactions.
How Scorpions Get Inside Your Home
Scorpions can squeeze through surprisingly small gaps. They don’t need a wide-open door. Common entry points include gaps around doors and windows, cracks in the foundation, spaces around utility line penetrations (where plumbing or wiring enters the wall), garage door edges, and exterior vents. Weep holes, the small openings in brick exteriors designed for drainage, are another frequent entry route.
A single scorpion inside doesn’t necessarily mean you have an infestation, but it does mean there’s a gap somewhere they’re exploiting. Because they’re nocturnal and tend to hide in dark, tight spaces, you can have scorpions in your home for a while before you see one. Common hiding spots indoors include shoes, closets, folded laundry, attics, and garages.
Keeping Scorpions Out
Exclusion, meaning physically blocking entry points, is the most effective long-term strategy. Walk around your home’s exterior and look for gaps around doors, windows, utility lines, vents, and the foundation. Weatherstripping under doors, caulk around pipes and wiring, and door sweeps on garage doors all help. For weep holes, avoid sealing them completely. They serve an important role in managing moisture behind your brick walls. Instead, use mesh inserts or screens specifically designed to let air and water pass through while blocking pests.
Landscaping matters too. Keep shrubs, bushes, and tree branches trimmed away from exterior walls. Remove rock piles, leaf litter, and other ground-level debris near the foundation. Store firewood at least 20 feet from the house and elevate it off the ground. Outdoor clutter like stacked pots, tarps, or cardboard gives scorpions exactly the kind of dark, sheltered habitat they prefer.
Indoors, reduce humidity where possible (scorpions need water), shake out shoes and clothing that have been sitting on the floor, and keep closets and storage areas tidy. If you’re finding scorpions regularly, a professional pest inspection can identify the specific entry points on your home and apply targeted treatments. Routine inspections, especially before summer, help stay ahead of peak season rather than reacting once scorpions are already inside.
Pets and Scorpion Stings
Dogs and cats sometimes encounter scorpions, particularly curious dogs that try to paw at or bite them. A sting from a striped bark scorpion will typically cause localized pain, swelling, and restlessness in a pet. Most healthy adult dogs and cats recover without intervention, but smaller animals and puppies or kittens are at higher risk. If your pet is stung and shows signs beyond mild pain, such as drooling, difficulty walking, vomiting, or unusual eye movements, contact your veterinarian. Keeping your yard clear of scorpion-friendly debris and checking pet bedding in garages or porches reduces the chances of an encounter.