Summer in Phoenix means extreme heat, monsoon moisture, and a surge in pest activity that catches many homeowners off guard. The combination of temperatures that regularly exceed 110 degrees and the humidity spike from July monsoons creates ideal conditions for a long list of pests. Here are the six you are most likely to encounter. Bark scorpions peak from June through September, driven by warm nights, abundant prey, and the birth of new young in late spring. They are most active after dark and most likely to enter homes seeking cool, dark hiding spots during the day. Cockroaches — both the large American cockroach and the small German cockroach — surge during monsoon season as moisture drives them out of sewer systems and accelerates indoor reproduction.

Roof rats are year-round pests in Phoenix but become more visible in summer as they forage more aggressively to feed their young. They are most active at night and most often detected by sounds in the attic. Mosquitoes are almost entirely a monsoon-season pest in Phoenix — they cannot breed without standing water, and the monsoon rains create the breeding sites they need. Activity peaks in July, August, and September. Crickets surge in late summer and fall, attracted to exterior lights and driven indoors by cooling temperatures. They are a nuisance pest but also an important food source for scorpions — controlling crickets reduces scorpion activity. Black widow spiders are active year-round but most visible in summer when they build webs in garages, under outdoor furniture, and in block wall voids.

The most effective summer pest strategy is a pre-monsoon perimeter treatment applied in June, before the rains arrive and wash away your chemical barrier. This treatment addresses scorpions, cockroaches, crickets, and spiders simultaneously and creates a residual barrier that lasts through the peak of monsoon season. Pest Control Bros provides pre-monsoon and summer pest control across Maricopa, Chandler, Casa Grande, Tempe, Gilbert, and Mesa. Free inspections, no contracts, same-week service.