Mosquitoes
most searchedPeaks in May, Jun, Jul, Aug
Anywhere water stands: tires, gutters, birdbaths, buckets, planters, roof voids
Mountain & West · State guide
Pests in Arizona
Hot desert with a very short mild season. High elevation in northern Arizona behaves completely differently from the Phoenix basin. The single most-searched pest in Arizona is Mosquitoes. Below: what drives pressure here, when each pest peaks, and the prevention steps that matter most in this climate.
- 7
- pests tracked
- 7
- have a peak month
- 14
- guides linked
- 7b–11
- hardiness zone
[ 01 ] Most searched
The most-searched pest in Arizona
Based on Google search interest across 30 common household pests. Source: Organic Lesson, “The Most Troublesome Household Pests in Each State,” Google Trends analysis of 30 common household pests, reported by Pest Control Technology
Mosquitoes
- Looks like
- Small dark flies with long legs; females pierce skin to feed on blood
- Where you find it
- Anywhere water stands: tires, gutters, birdbaths, buckets, planters, roof voids
- Size
- 1/4 to 1/2 inch (6–13 mm)
- Health risk
- high
Mosquitoes transmit West Nile virus, eastern equine encephalitis and La Crosse encephalitis. Protect skin with repellent first, then treat the yard; spraying alone rarely clears an active yard.
Signs in the home
- Biting within minutes of being outdoors or near standing water
- Puddles that never drain after rain
- Egg rafts on the surface of standing water
- Birds or amphibians behaving unusually
[ 02 ] Local pressure
Pests that drive pressure in Arizona
Each bar shows twelve months of seasonal activity. Bars come from the same dataset as the pest activity index, so the months here always match the months there.
Scorpions
Peaks in Apr, May, Jun, Jul, Aug
Southwest homes: walls, attics, closets, shoes, landscape rock
Bees
Peaks in May, Jun
Fascia, eaves, decks and untreated wood (carpenter bees); wall voids, trees (honey bees)
Wasps & Yellow Jackets
Peaks in Jun, Jul, Aug, Sep
Eaves, sheds, playsets, wall voids, ground holes (yellow jackets)
Termites
Peaks in Apr, May, Jun
Foundations, crawl spaces, wooden structures in contact with soil
Spiders
Peaks in Jun, Jul, Aug, Sep
Basements, garages, corners, window frames, woodpiles
Lizards
Peaks in Apr, May, Jun, Jul, Aug, Sep
Porches, walls near lights, garages; indoors in warm states
Peak Active Low Dormant
[ 03 ] Climate
What Arizona's climate does to pest pressure
Mountain & West · zone 7b–11
Hot desert with a very short mild season. High elevation in northern Arizona behaves completely differently from the Phoenix basin.
Dry, high-altitude conditions where elevation changes the pest list over short distances.
Seasonal timing moves with local weather. A warm wet spring in Arizona can pull a spring species forward by a month, and a dry year can delay a fall species. Use the bars above as a planning window, not a forecast.
[ 04 ] Local mistake
The thing homeowners in Arizona get wrong
Scorpions get the attention, but termites do the most structural damage in Arizona, and they are active in soil that looks bone dry because they follow moisture underground. Never irrigate the foundation perimeter.
[ 05 ] Prevention
What to do in Arizona before the season starts
Ordered by how much they move the needle in this climate, not by how easy they are.
- 1
Keep irrigation spray heads aimed away from the foundation — wet soil against the slab is what feeds termites
- 2
Do not use consumer foggers in an enclosed patio; the pest moves out and the problem returns
- 3
In the Phoenix basin, window sealing on the ground floor matters more than anything else you can buy
[ 06 ] Questions
Arizona pest questions
What is the most common pest in Arizona?
Flies, ants and mosquitoes are the three most-searched household pests in the United States. In Arizona the top-searched pest is Mosquitoes. It is a search-interest ranking rather than a count of infestations, but it tracks what people are actually asking for help with.
What month are pests most active in Arizona?
It depends on the pest, and the month-by-month answer differs by climate zone. Arizona sits mostly in USDA hardiness zone 7b–11. Check the peak months on each pest card above, or use the full pest activity index for the year-long view. Seasonal timing always shifts with local weather, so treat the calendar as a planning aid rather than a forecast.
Can I treat pests in Arizona myself, or do I need a pro?
Most of the pests on this page are within reach of correct DIY if you identify the species first and use the method that matches it. Termites, bed bugs, wildlife in the attic and any infestation that spans several rooms are the honest exceptions. The pro threshold is usually about two weeks of correct method with no change, not about the size of the sighting.
Why do I get pests in Arizona even after treating?
In most repeat cases the treatment missed the source rather than failing. Water against the foundation, an unsealed gap that leads indoors, or a colony living inside a wall where a surface spray cannot reach it are the usual explanations. Identify where the pest is living before you buy anything for it.
Pro threshold
When to stop treating it yourself in Arizona
Two weeks of correct method with the right product and no change is the honest limit. Past that, a pro finds what you cannot see — and you should ask which product they are using and why, what the guarantee covers, and whether the price is per treatment or per year.
[ 07 ] Nearby
Other mountain & west states
Search-interest ranking: Organic Lesson, “The Most Troublesome Household Pests in Each State,” Google Trends analysis of 30 common household pests, reported by Pest Control Technology. Read the study summary. Zone ranges are USDA Plant Hardiness Zones. Monthly activity is this site's own dataset, also published on the pest activity index.