How to Get Rid of Scorpions in Your House: A Complete Control Guide

Why Scorpion Control Is Different from Other Pest Management

Scorpions have characteristics that make them unusually difficult to control compared to most insects. They are resistant to dehydration and can survive for months without food or water. Their hard exoskeleton reduces contact with insecticide residues. They are primarily nocturnal and spend daylight hours in harborage — often not in the areas that get treated. And unlike most insects, the Arizona bark scorpion climbs vertical surfaces, meaning it enters structures through upper entry points as easily as lower ones. Effective scorpion management addresses all of these factors: harborage elimination, structural exclusion, prey insect reduction, and timed perimeter treatment.

Know Your Scorpion Species

The US has approximately 90 scorpion species, but only a handful are commonly encountered in residential settings. The species present in your area determines the risk level and informs the control approach.

• Arizona Bark Scorpion (Centruroides sculpturatus) — The most medically significant scorpion in North America. Found in Arizona, Nevada, New Mexico, and parts of California and Utah. Unlike most scorpions, it climbs walls and is commonly found in ceiling joints, on walls, in closets, and in shoes. Its sting can cause severe pain, numbness, and systemic reactions — particularly dangerous to children and elderly adults.
• Striped Bark Scorpion (Centruroides vittatus) — The most common scorpion across Texas, Oklahoma, Kansas, Arkansas, and surrounding states. Smaller than the Arizona bark scorpion, with two dark stripes on the abdomen. Its sting is painful but generally not medically critical for healthy adults. Enters structures readily and is commonly found in shoes, folded towels, and bedding.
• Desert Hairy Scorpion (Hadrurus arizonensis) — The largest scorpion in North America, reaching 5–6 inches. Found across the Mojave and Sonoran deserts. Impressive in size but less venomous than the bark scorpion — its sting is comparable to a bee sting for most adults. Primarily ground-dwelling and less likely to enter structures than bark scorpions.
• Stripetail Scorpion (Vaejovis spinigerus) — Common throughout Arizona and surrounding desert states. Ground-dwelling, found under rocks, debris, and in soil. Not as medically significant as bark scorpions. Commonly encountered in yards and occasionally enters through ground-level gaps.

Blacklight Inspection: Knowing What You're Dealing With

Scorpions fluoresce bright blue-green under ultraviolet (UV) light — a property caused by hyaline compounds in their cuticle that persists even in museum specimens centuries old. A blacklight inspection of your property after dark is the most accurate way to assess scorpion population density, identify primary harborage locations, and determine whether a treatment program is working. Inspections once or twice per week during active seasons give you a real-time picture that daytime visual inspection cannot provide.

• Equipment — A UV blacklight flashlight in the 365–395nm wavelength range works well for scorpion detection. Shorter wavelength (365nm) lights produce more vivid fluorescence in bright ambient conditions. Many hardware and outdoor stores carry suitable models.
• Inspection Route — Walk the exterior perimeter of the structure, including block walls, fences, tree trunks, wood piles, landscape rock, and debris piles. Check weep holes in block walls specifically — these are primary harborage sites. Then inspect the yard surface, including irrigated areas where prey insects concentrate.
• Interior Inspection — After treatment, periodic interior blacklight inspections identify any scorpions that have entered. Focus on closets, bathrooms, utility areas, and anywhere shoes or clothing are stored on or near the floor.
• Population Density Assessment — Counting scorpions observed per inspection walk gives a baseline. A successful treatment program should show a steady decline in blacklight counts over 4–8 weeks.

Structural Exclusion: The Credit Card Rule

The Arizona bark scorpion can enter a gap as narrow as a credit card — approximately 1/16 inch. This means virtually any gap in a structure's exterior envelope is a potential entry point. Exclusion for scorpions must be more thorough than for most pests, addressing gaps that would not be considered relevant for rodent or insect exclusion.

• Door Gaps and Sweeps — The gap between an exterior door and the threshold is the single most common scorpion entry point in residential structures. A door sweep that creates a seal against the threshold when the door is closed eliminates this entry completely. Check every exterior door, including garage side doors and sliding glass doors.
• Weep Holes in Block Walls — CMU block wall construction common in the desert Southwest includes weep holes at the base designed for drainage. These are primary scorpion harborage and entry points. Weep hole covers — screens designed specifically for this gap size — seal the entry while maintaining drainage function.
• Utility and Plumbing Penetrations — Gaps around pipes, conduits, and cable lines entering the structure are common bark scorpion entry points. Foam backer rod and exterior-grade caulk eliminate these entry points.
• Window Frame Gaps and Screen Integrity — Bark scorpions climb to window height and enter through gaps in window frame joints or torn screens. Inspect all window screens and frames for gaps that would pass a credit card.

Harborage Reduction and Prey Management

Scorpions concentrate where they have harborage (shelter from heat and predators) and food (prey insects). Reducing both on your property creates conditions less hospitable to established scorpion populations and reduces pressure toward the structure.

• Eliminate Ground-Level Harborage — Wood piles, stacked lumber, stored materials, landscape rock, and ground cover debris adjacent to the structure are high-density scorpion harborage. Moving stored items off the ground and away from the structure reduces the harborage that concentrates scorpions near entry points.
• Irrigation and Moisture Management — Crickets, cockroaches, and other prey insects concentrate near moisture sources — drip irrigation lines, leaking hose bibs, and poor drainage areas. Scorpions follow their prey. Addressing excess moisture around the structure reduces prey insect density and scorpion pressure simultaneously.
• Outdoor Lighting — Bright white outdoor lights attract insects, which attract scorpions. Switching to yellow or sodium vapor bulbs — which attract fewer insects — reduces the prey insect concentration near entry points at night when scorpions are active.
• Treat for Prey Insects — Professional perimeter treatments that target scorpions also kill crickets and cockroaches that scorpions feed on. The prey insect reduction compounds the direct effect on scorpion populations over time.