Arizona wildlife in desert and mountain habitats

Arizona Bark Scorpion

Originally written by Tony Subia

Updated by AZ Leisure Staff Writers on October 29, 2026

Arizona bark scorpion in its natural rocky desert habitat

The Arizona bark scorpion (Centruroides sculpturatus) is a small, tan scorpion found in desert, residential and riparian environments across much of Arizona. It is nocturnal, an excellent climber and the Arizona scorpion of greatest medical concern. Although most stings cause intense localized pain, numbness or tingling, young children and people who develop body-wide symptoms may require urgent medical care. Arizona bark scorpions also serve an important ecological role by preying on crickets, cockroaches, beetles, spiders and other small animals.

Bark Scorpion Quick Facts
Where Bark Scorpions Live
How To Identify Bark Scorpions
Venom & Sting Symptoms
Scorpion Sting First Aid
When To Seek Emergency Care
Keeping Scorpions Out Of Your Home
Frequently Asked Questions

Arizona Bark Scorpion Quick Facts

Scientific name: Centruroides sculpturatus
Animal group: Arachnid
Typical adult size: About 2 to 3 inches long, including the tail
Color: Pale tan, yellowish tan or light brown
Activity: Primarily nocturnal
Diet: Crickets, cockroaches, beetles, spiders and other small prey
Habitat: Desert terrain, rocky areas, trees, block walls and buildings
Range: Primarily Arizona, with populations in neighboring parts of the Southwest and Mexico
Defense: Venomous sting delivered from the tip of the tail
Medical concern: Arizona’s most medically significant scorpion
Season: Most active during warm weather, particularly at night
Visibility under UV light: Scorpions fluoresce when illuminated with ultraviolet light

Scorpions are ancient arachnids with an evolutionary history extending hundreds of millions of years. Although their appearance can be intimidating, they are important predators that help control insect populations. Arizona bark scorpions generally avoid people, but accidental contact can occur when they shelter beneath shoes, clothing, rocks or household objects.

Arizona bark scorpion hiding beneath the toe of a hiking boot on a tiled closet floor

Where to Find Arizona Bark Scorpions

Arizona bark scorpions occur primarily in low-elevation desert and foothill areas, including communities throughout central and southern Arizona. They are frequently encountered around Phoenix, Mesa, Scottsdale, Tempe, Chandler, Tucson and other Sonoran Desert communities.

During daylight hours, bark scorpions shelter in narrow, protected spaces that reduce exposure to heat and dryness. Common hiding places include loose tree bark, rock crevices, stacked lumber, firewood, block walls, palm debris, landscaping materials, garages and gaps around buildings. At night, they emerge to hunt insects and other small prey.

Warm evenings from spring through fall generally provide the best opportunity to observe scorpions. A UV flashlight causes their exoskeletons to fluoresce, making them easier to see after dark. Wear closed shoes, avoid placing hands beneath rocks or debris and observe scorpions without touching or disturbing them.

All scorpions produce venom, but only a small proportion of species pose a serious medical threat to people. Arizona is home to numerous scorpion species, most of which cause localized pain rather than severe poisoning. The Arizona bark scorpion is the species of greatest medical concern in the state because its venom can produce serious neurological symptoms, particularly in young children.

How to Identify an Arizona Bark Scorpion

Arizona bark scorpions are relatively small and slender compared with many other desert scorpions. Their bodies are usually pale tan or yellowish brown, helping them blend into desert soil, tree bark and block walls. Identification based only on color can be difficult because several Arizona scorpions have similar coloration.

Small, slender body
Thin pincers compared with heavier-bodied scorpions
Long, narrow tail segments
Pale tan or yellow-brown coloration
Strong climbing ability
Frequently found on walls, trees and other vertical surfaces

Do not handle a scorpion to identify it. A clear photograph taken from a safe distance may be useful when consulting a pest-management professional or poison specialist.

Arizona Bark Scorpion Facts

The Arizona bark scorpion is considered the most medically significant scorpion in the United States. Its sting can cause intense pain and neurological symptoms, although life-threatening outcomes are uncommon with timely medical care. Young children are particularly vulnerable to severe reactions, and anyone experiencing difficulty breathing, swallowing problems or uncontrolled muscle movements requires immediate medical attention.

Adult Arizona bark scorpions are relatively small, commonly measuring about 2 to 3 inches in total length, including the tail. Their slender bodies, narrow pincers and pale tan or yellowish coloration help distinguish them from many heavier-bodied desert scorpions. However, size and color alone are not reliable for identification because other southwestern scorpion species can look similar.

Arizona bark scorpions are accomplished climbers that can scale trees, textured walls, block fences and other rough surfaces. Their relatively flattened bodies allow them to shelter in narrow cracks and crevices around buildings. They may enter homes through gaps around doors, windows, utility openings and foundations, especially where insects and protected hiding places are available.

Life Cycle and Reproduction

Arizona bark scorpions give birth to live young rather than laying eggs outside the body. After birth, the young climb onto their mother’s back, where they remain protected until completing their first molt. They then disperse and begin living independently.

Scorpions must molt repeatedly as they grow because their hard exoskeleton cannot expand. During a molt, the old outer covering splits and the scorpion emerges with a new, soft exoskeleton. It remains vulnerable until the new covering hardens.

Courtship involves a coordinated movement in which the male grasps the female’s pincers and guides her over a sperm packet deposited on the ground. Reproductive timing, development and lifespan vary with temperature, food availability and environmental conditions.

Range, Habitat and Behavior

Geographic Range

The Arizona bark scorpion is most closely associated with Arizona and the Sonoran Desert, although its broader range extends into neighboring areas of the southwestern United States and northwestern Mexico. Within Arizona, it occurs in natural desert habitat as well as established residential neighborhoods.

Preferred Habitat

Bark scorpions seek sheltered locations that offer protection from daytime heat, predators and water loss. They may hide beneath rocks, fallen wood, loose bark, landscaping materials and outdoor equipment. Around homes, they can occupy cracks, block walls, garages, storage areas and other dark spaces.

Nocturnal Behavior

Arizona bark scorpions are primarily active at night. They emerge after dark to hunt and often remain hidden during the hottest part of the day. Encounters are especially common during warm summer evenings, when both scorpions and their insect prey are active.

Climbing Ability

Unlike many heavier-bodied scorpions, bark scorpions are accomplished climbers. They may climb walls, trees, textured masonry and other rough surfaces. This ability contributes to encounters on patios, fences and inside buildings.

Cold-Weather Activity

Scorpion activity generally declines during cold weather. Bark scorpions may remain sheltered in protected spaces and become active again when temperatures rise. They should not be described as undergoing true winter hibernation in every setting.

Arizona Bark Scorpion Venom

Scorpions are venomous rather than poisonous because they inject venom through a stinger. The Arizona bark scorpion’s venom primarily affects the nervous system and can cause intense pain, burning, tingling or numbness near the sting site. The affected area may also become unusually sensitive to touch, pressure, heat or cold.

Some victims develop body-wide neurologic symptoms. These may include muscle twitching, unusual or uncontrolled eye movements, agitation, drooling, difficulty speaking or swallowing, abdominal cramping, vomiting or trouble breathing. Young children face the greatest risk of developing serious symptoms because the amount of venom is greater relative to their body size.

Most healthy adults experience severe localized discomfort without life-threatening complications. However, anyone with significant neurologic symptoms, difficulty breathing, difficulty swallowing or rapidly worsening illness requires immediate medical attention.

What to Do If Stung by a Scorpion

Move away from the scorpion and remain calm.
Wash the sting site gently with soap and water.
Apply a cool compress to help reduce pain. Do not place ice directly on the skin or immerse the limb in ice water.
Position the affected arm or leg comfortably.
Remove rings, bracelets or other tight items if swelling develops.
Call Poison Control at 1-800-222-1222 for case-specific guidance.
Watch for muscle twitching, unusual eye movements, drooling, trouble speaking, difficulty swallowing, vomiting or breathing problems.
Seek emergency care immediately for severe or body-wide symptoms.
Closely monitor infants and young children because they have a greater risk of serious effects.
Do not cut the skin, attempt to suck out venom or apply a tourniquet.
Do not take sedatives unless directed by a medical professional.

When to Seek Emergency Medical Care

Call 911 or seek emergency medical care immediately if a person develops any of the following after a suspected scorpion sting:

Difficulty breathing
Difficulty swallowing or excessive drooling
Uncontrolled or unusual eye movements
Severe muscle twitching or jerking movements
Slurred speech or a thick-tongue sensation
Seizure-like activity or convulsions
Severe agitation, confusion or loss of coordination
Rapidly worsening symptoms affecting multiple parts of the body
Signs of a serious allergic reaction, such as facial swelling or breathing difficulty

When symptoms are limited to pain, burning, tingling or numbness near the sting, call Poison Control at 1-800-222-1222 for instructions and monitoring advice.

How to Reduce Scorpions Around Your Home

No single method guarantees a scorpion-free property. The most effective approach combines exclusion, habitat reduction and control of the insects that scorpions eat.

Seal cracks and gaps around foundations, utility lines, windows and doors.
Install or replace weather stripping beneath exterior doors.
Repair damaged window screens and door screens.
Move firewood, lumber, bricks and stored materials away from exterior walls.
Remove loose debris, leaf litter and unnecessary clutter.
Trim vegetation that touches the house.
Remove loose palm debris and other sheltered hiding places.
Reduce cockroaches, crickets and other insects that provide food for scorpions.
Wear gloves when moving rocks, firewood or outdoor equipment.
Shake out shoes, clothing, towels and bedding before use.
Do not walk barefoot outdoors at night in areas where scorpions are common.
Use a UV flashlight cautiously to inspect patios, walls and landscaped areas after dark.
Consult a licensed pest-management professional when scorpions are repeatedly found indoors.

Scorpion Stings and Pets

Dogs and cats can be stung when they investigate or step on a scorpion. Signs may include sudden pain, pawing at the face, limping, vocalizing, drooling, shaking or unusual behavior. Because symptoms and treatment depend on the animal’s size, health and degree of exposure, contact a veterinarian promptly after a suspected sting. Severe weakness, breathing difficulty, collapse or uncontrolled muscle movement requires emergency veterinary care.

Scorpion Anatomy

Labeled scorpion anatomy diagram identifying major body parts

Frequently Asked Questions About Arizona Bark Scorpions

Are Arizona bark scorpions dangerous?

The Arizona bark scorpion is the state’s most medically significant scorpion. Most healthy adults experience severe localized pain, burning, tingling or numbness, but young children and people with body-wide neurologic symptoms may require urgent treatment.

Can an Arizona bark scorpion kill a person?

Life-threatening reactions are uncommon in the United States, but severe envenomation can occur. Difficulty breathing, unusual eye movements, drooling, muscle twitching, convulsions or difficulty swallowing requires immediate medical care.

What should I do after a bark scorpion sting?

Wash the area with soap and water, apply a cool compress and call Poison Control at 1-800-222-1222. Seek emergency care for breathing difficulty, trouble swallowing, uncontrolled muscle movement or other severe symptoms.

What does an Arizona bark scorpion look like?

It is a relatively small, slender scorpion that is usually pale tan or yellowish brown. It has narrow pincers, a slender tail and a strong ability to climb rough vertical surfaces.

Where do Arizona bark scorpions live?

They live in desert, foothill, riparian and residential environments. They may shelter beneath rocks, wood, loose tree bark, landscaping materials, block walls and protected areas around buildings.

When are bark scorpions most active?

They are primarily nocturnal and are most often encountered during warm weather. Many reported stings occur at night during the summer months.

Do Arizona bark scorpions glow under blacklight?

Yes. Like other scorpions, their exoskeleton fluoresces under ultraviolet light, making them easier to locate after dark.

Can bark scorpions climb walls?

Yes. Arizona bark scorpions are excellent climbers and may climb trees, block walls, stucco and other textured surfaces.

What do Arizona bark scorpions eat?

They prey on crickets, cockroaches, beetles, spiders and other small animals. Reducing insects around a building can make the area less attractive to scorpions.

Do bark scorpions live inside houses?

They normally live outdoors but can enter buildings through gaps around doors, windows, utility lines and foundations. Indoors, they may hide in dark, protected locations such as garages, closets, stored items and shoes.

Do bark scorpions hibernate?

Their activity generally decreases during colder weather, and they may remain sheltered for extended periods. Activity increases again when temperatures become warmer.

How can I keep scorpions out of my house?

Seal cracks, install door sweeps, repair screens, remove debris and stored wood near the house, reduce insect prey and shake out shoes and clothing before use.