If you live in the Phoenix metro area, you already know that bark scorpions are a year-round concern — but their activity level changes dramatically with the seasons. Understanding that cycle is the key to staying ahead of them. Bark scorpions (Centruroides sculpturatus) are cold-blooded, meaning their activity is directly tied to ambient temperature. They become sluggish when temperatures drop below 60 degrees Fahrenheit and essentially dormant below 50 degrees. In Phoenix, where winter lows rarely dip below the mid-40s and daytime highs often stay in the 60s and 70s, scorpions never fully hibernate — they simply slow down.

Activity begins picking up in late February and March as nighttime temperatures climb back into the 60s. By April and May, scorpions are actively hunting and reproducing. June through September is peak season — warm nights, abundant prey insects, and the monsoon moisture that drives crickets and other food sources into the open all combine to push scorpion activity to its highest point of the year. This is when the majority of stings occur and when homeowners are most likely to find scorpions inside their homes. October brings a gradual slowdown, and by December and January, activity is at its lowest — though scorpions can still be found on warm winter nights.

The practical takeaway: your pest control schedule should match the scorpion calendar. Starting professional perimeter treatments in February or March — before peak season — gives the residual chemistry time to build up and eliminates the prey insects scorpions depend on. Waiting until you find one inside in July means you are already behind. Pest Control Bros provides year-round scorpion control across Maricopa, Chandler, Casa Grande, Tempe, Gilbert, and Mesa. No contracts, free inspections, and service timed to the Arizona scorpion season.