Arizona pest season calendar
Arizona's heat shapes its pest calendar: termites swarm in summer, and wet weather drives ants and cockroaches indoors. These windows are keyed to University of Arizona Cooperative Extension research, not a marketing calendar.
| Pest | Peak window | What it means for you | Source |
|---|---|---|---|
| Subterranean termites | summer peak | Summer is peak termite season in Arizona. Inspect your home twice a year for mud tubes and shed wings, and keep substructural wood at least 12 inches above soil with openings sealed. | University of Arizona Cooperative Extension (Backyards and Beyond) |
| Mosquitoes | year-round, worst after wet weather | Mosquitoes are active year-round in Arizona and thrive after monsoon rains. Eliminate standing water after storms, even small containers, and use EPA-registered repellents outdoors. | University of Arizona (Community IPM) |
| Bark scorpions | most of the year, less active November through March | Bark scorpions are active when nighttime temperatures stay above about 70 degrees. During active months, do evening UV-light checks of bedrooms and bathrooms and keep door sweeps and weep holes sealed. | University of Arizona (Community IPM) |
| Ants | populations increase after wet weather | After heavy rains, ants are displaced from their habitats and move into homes for food and shelter. Seal entry points and remove food and water sources during wet periods. | University of Arizona (Community IPM) |
| Cockroaches | drawn indoors during extended wet spells | During extended wet spells, outdoor cockroaches such as sewer roaches and Turkestan roaches get displaced and move indoors. Address sewer drains and irrigation-box harborage near the structure. | University of Arizona (Community IPM) |
Windows are general guidance from the cited university extension and state sources, checked on 2026-08-13. Local weather and microclimate shift them, so treat these as planning ranges rather than exact dates.
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