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.

• Subterranean termites

  Peak window: 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.

  Source: University of Arizona Cooperative Extension (Backyards and Beyond)

• Mosquitoes

  Peak window: 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.

  Source: University of Arizona (Community IPM)

• Bark scorpions

  Peak window: 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.

  Source: University of Arizona (Community IPM)

• Ants

  Peak window: 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.

  Source: University of Arizona (Community IPM)

• Cockroaches

  Peak window: 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.

  Source: University of Arizona (Community IPM)

Windows are general guidance from the cited university extension and state sources, checked on August 13, 2026. Local weather and microclimate shift them, so treat these as planning ranges rather than exact dates.