In Central Arizona, homeowners deal with pest activity in every season, not just the warmer months. The East Valley’s desert climate produces year-round pest activity that shifts by species and intensity throughout the year. For homeowners in Gilbert, Mesa, and Chandler, knowing what to expect each month helps with both preparation and response. Veterans Choice Pest Solutions serves the East Valley year-round, and the patterns described here reflect what we see consistently on local properties.
January and February
The coolest months of the year in the East Valley bring reduced pest activity but do not eliminate it. Roof rats remain active year-round regardless of temperature and are frequently discovered in attics during winter months when homeowners spend more time indoors and notice sounds of activity overhead. Scorpions slow down in cold weather but do not hibernate—they can be encountered on warm winter days and in heated interior spaces throughout the season. Spiders, including black widows, remain active in protected outdoor spaces and in garages and storage areas.
March and April
Pest activity accelerates sharply as temperatures rise in March and April. Scorpion activity increases significantly—this is when bark scorpions begin moving more aggressively and when interior encounters in East Valley homes start to climb. Ant activity picks up across multiple species, with trailing activity along foundations and interior baseboards becoming more noticeable. Termite swarm season begins in late March and continues through spring. Paper wasps become visible as queens emerge from winter shelter sites and begin building new nests under eaves and in exterior sheltered spaces.
May and June
May and June are among the most active pest months in the East Valley. Scorpion activity reaches high levels as temperatures climb and insects—the scorpion’s primary food source—become abundant. Cockroach activity increases as outdoor temperatures reach the range that American cockroaches and Turkestan cockroaches prefer. Roof rats are actively foraging, and roof rat complaints increase as citrus trees produce new fruit. Stinging insect colonies that began in March are growing rapidly, and yellow jacket nests that started small become more hazardous as worker populations increase.
July, August, and September—Monsoon Season
Monsoon season transforms pest activity across the board. The arrival of monsoon moisture triggers insect emergence, ant swarming flights, termite swarming, and scorpion displacement. Cockroach activity surges. Mosquitoes breed in the standing water that accumulates after storms. This is the most intense and diverse pest activity period of the year in the East Valley. Scorpion encounters inside homes peak during and immediately after monsoon storms as displaced scorpions move toward structures.
October and November
As temperatures moderate in fall, pest activity shifts rather than declining. Roof rats that have been foraging outdoors through summer begin moving more aggressively toward structures as outdoor food sources change. Scorpion activity remains elevated through October before declining in November as temperatures drop. Black widow spiders are highly active in fall—this is one of the peak periods for black widow encounters in garages and outdoor storage areas in the East Valley.
December
December brings the lowest overall pest activity of the year, but persistent species remain a concern. Roof rats are active in attics throughout winter. Scorpions in heated homes and in protected outdoor harborage remain present. Black widows and other spiders continue to occupy garages and storage areas regardless of outdoor temperature.
Year-Round Pest Management in the East Valley
The East Valley pest calendar makes clear that there is no true off-season for pest control in Gilbert, Mesa, and Chandler. A year-round protection program that accounts for the seasonal shifts in species activity provides the most consistent coverage. Contact Veterans Choice Pest Solutions for a free quote to put a plan in place that covers your home through every season.