Does fall rain bring out termites and other bugs in Arizona?

Arizona context

Hydra's termite work covers the Gila Valley and Greenlee County, Sierra Vista and Cochise County, and the White Mountains, and which termite flight you see depends partly on elevation. University of Arizona Extension says the arid-land subterranean termite swarms January to March below about 4,000 feet and in June and July above it, while the desert subterranean termite, the most common and by far the most destructive, flies after rain during the monsoon from July to September. Drywood termites fly on bright sunny days from June to August, not timed to rain. Arizona also keeps public termite records: licensed companies must file a termite action report with the state within 30 days after certain termite treatments and inspection reports (A.R.S. 3-3631), and you can search them by address on the Arizona Department of Agriculture's termite action report search.

What to check after a storm

• With a good flashlight, check the foundation wall at the soil line, cracks in concrete floors and spots where pipes come up through the slab for mud tubes
• Tap wood near any tube every few inches with a screwdriver. Damaged wood sounds hollow
• If you find termites or winged insects, collect a few in alcohol so they can be identified
• Make sure water drains away from the house and the stem wall
• Keep shrubs, trees and main irrigation lines at least 18 inches from the stem wall
• Leave about 4 inches between the soil line and the bottom of the stucco so the stem wall can be inspected
• Fix leaking pipes and faucets, and move firewood and scrap lumber away from outside walls
• Empty standing water from buckets, tires, pots and other containers every week
• Screen weep holes with coarse steel mesh and keep door sweeps tight to keep scorpions out

What rain means for termites

Subterranean termites get their name because they live in contact with soil as a source of moisture, University of Arizona Extension says. To reach wood above ground, they build tubes of soil, fecal matter and wood chips, and a mud tube on the outside stem wall is a good sign of activity.

A swarm is a flight of winged adults leaving the colony. During a swarm they may be attracted to lights, then they shed their wings and look for a place to start a new colony. University of Arizona Extension says usually fewer than 1% of swarmers survive to produce a colony.

University of Arizona Extension recommends checking the stem wall about twice a year: once in spring, especially after a wet winter, and again near the end of the monsoon season, when termites are most active.

Moisture around the house is the part you can control. The Arizona Department of Agriculture lists leaking pipes and faucets, sprinklers and bubblers that over-water foundation walls, wood debris and firewood against outer walls, built-in planters against outer walls, and wooden trellises or fences touching soil as risk factors. It says termites can get in through foundation cracks as narrow as 1/64 of an inch.

Other pests that show up after rain

Scorpions: University of Arizona Extension says bark scorpions move when irrigation or monsoon rain floods them out of their hiding places, and that homes near rivers and arroyos can see more scorpions during the monsoon because they may have been washed downstream.

American cockroaches: A University of Arizona entomologist says summer rain and construction can force American cockroaches out of sewers and into homes. Keeping drains covered can reduce the risk.

Mosquitoes: Mosquitoes lay eggs in standing water, and in Arizona they peak between June and October, the same University of Arizona entomologist says. They can grow from egg to adult in about 10 days, so check your yard for standing water every week.

Winged ants and termites: Both send out winged adults, called alates, which often leave their nests during the monsoon, University of Arizona Extension reports. Ants have two pairs of wings of unequal size and a pinched waist, while termites have four wings of equal size and a straight body.

Does Arizona law require a termite inspection when a home is sold?

No. The Arizona Department of Agriculture says state law sets standards for how Wood-Destroying Insect Inspection Reports (WDIIRs) are done but does not legally mandate a report for property sales. It says the requirement comes from lending institutions, and that banks and mortgage lenders frequently require one before closing.

Some loan programs do require one. VA says wood-destroying insect information is required for the entire state of Arizona on VA home loans. Ask your lender or real estate agent what your loan and purchase contract require.

When a report is done, state law controls who can do it. Under A.R.S. 3-3633, only an applicator certified in wood-destroying organism management, with at least five hours of instruction on these reports, may complete one. The report covers what was visible and accessible at the time of the inspection and is not a guarantee about termites after that date.

When professional service is warranted

If you find mud tubes, hollow wood or termites indoors, University of Arizona Extension says to consider a professional inspection, and it recommends an annual inspection by a pest management professional even if you don't have termites. The Arizona Department of Agriculture says all inspectors and pest management companies must be licensed by its Pest Management Division.

How Hydra handles it

Our Service Pros inspect for termites at every Hydra branch, from the Gila Valley and Greenlee County to Sierra Vista and the White Mountains, and we complete Arizona WDIIR reports for home sales. To talk it through, call or text your local office to reach an Office Pro, or ask for a free custom quote.

Frequently asked

Related on this site

Related questions

• What are termite mud tubes?
• When is termite season in Arizona?
• How do I know if I have subterranean termites?
• What is a WDIIR (termite inspection report) in Arizona?

References

• University of Arizona Cooperative Extension: Termite Control for Homeowners (AZ1356)
• University of Arizona Cooperative Extension: Monsoon brings some unwanted pests to life and forces others inside (Aug. 17, 2026)
• University of Arizona Cooperative Extension: Scorpions of the Desert Southwest United States (AZ1768)
• University of Arizona Cooperative Extension: Scorpions (Backyard Gardener #184)
• Arizona Department of Agriculture: Wood-Destroying Insect Inspection Reports (WDIIR)
• A.R.S. 3-3633: Wood-destroying insect inspection reports
• A.R.S. 3-3631: Termite action report form
• VA Home Loans: Local Requirements (wood-destroying insect information)
• Arizona Department of Agriculture: public termite action report (TARF) search