Winter Scorpions in Arizona: What to Know and What to Do
Arizona bark scorpions stay active in winter by moving indoors and clustering in warm, dark spaces — garage corners, attic edges, behind baseboards, and under appliances. Winter is the best time of year to treat for scorpions because they're concentrated in fewer hiding places and exterior treatments persist longer in cooler temperatures.
- Pest
- Arizona bark scorpion (Centruroides sculpturatus)
- Peak indoor window
- November – March
- Most active regions
- Gila Valley, Sierra Vista, low-desert outskirts
- Urgency
- High if children, elderly, or pets are in the home
Why now
Bark scorpions are ectotherms — they regulate temperature by moving, not metabolism. When overnight lows drop below 50°F they migrate from outdoor harborage (rock piles, woodpiles, citrus root zones) into garages, attics, and wall voids where temperatures stay above freezing.
Prevention checklist
- Inspect with a UV blacklight at night — scorpions fluoresce bluish-green and are easy to find.
- Seal garage door corners with rodent-grade door sweeps; gaps of 1/8" are passable.
- Caulk around plumbing, gas, and electrical penetrations through exterior walls.
- Move firewood, decorative rock, and citrus deadfall at least 20 ft from foundation.
- Vacuum baseboard corners weekly in known-active rooms; dispose of the bag outdoors.
When to call us
- You've found more than one scorpion indoors in the past month.
- Anyone in the home has been stung this season.
- You're seeing scorpions in second-story or attic spaces — they're climbing inside walls.
- Children under 6 or pets under 20 lb live in the home.
What Hydra does on a winter visit
Hydra's winter scorpion visit combines a targeted interior crack-and-crevice treatment (baseboards, plumbing penetrations, garage seams), dust application in attic and wall voids where active, exterior perimeter spray, and granular bait treatment around the foundation. Year-round perimeter maintenance is the most effective long-term control strategy.
Common questions
Do scorpions hibernate in Arizona?
No — Arizona bark scorpions don't truly hibernate. They reduce activity below 50°F and concentrate in warm, dark indoor harborage. Winter is one of the best times to treat because they're stationary and concentrated.
Is winter a bad time to do scorpion pest control?
Winter is actually the best time. Cooler temperatures slow product breakdown, exterior treatments persist longer, and scorpions are clustered in known hiding places where targeted dust and crack-and-crevice work is most effective.
How do I find scorpions in my house at night?
Use a 365nm UV blacklight after dark — bark scorpions fluoresce bright bluish-green. Check baseboard corners, garage seams, attic perimeters, behind appliances, and under bath vanities. Wear closed-toe shoes.