Why Crickets Invade Washington Homes & How to Keep Them Out

Every August, the same thing happens across the Kittitas Valley. Homeowners start hearing chirping near the garage door at dusk, spot dark shapes crossing the patio after dark, and wonder whether this year is somehow worse than the last. It isn’t luck or coincidence. It’s climate. Ellensburg’s semi-arid summers are unusually good at building large cricket populations outdoors, and then the September temperature drop gives every one of those crickets a reason to come inside.

We’ve been managing pest pressure across Central Washington since 2011, and the cricket season here follows a pattern that’s as predictable as the harvest. Understanding what drives it is the first step toward getting ahead of it.

Why Late Summer Is Cricket Season in Central Washington

The Kittitas Valley sits in the Central Basin, identified by the Western Regional Climate Center as the lowest and driest section of eastern Washington. July and August can pass four to six weeks without measurable rainfall, and that prolonged dry stretch doesn’t suppress cricket populations. It concentrates them outdoors, where they thrive through the heat before the seasonal shift arrives.

Cricket eggs hatch in spring, and nymphs work through several developmental stages before reaching adulthood. By midsummer, populations across Ellensburg are at peak maturity, with average highs sitting around 82°F. Then September arrives and drops that average closer to 71°F. Crickets respond the way most cold-blooded insects do: they start looking for somewhere warmer. Your foundation, your garage, your crawl space all qualify. Western Washington doesn’t see this dynamic the same way because summer moisture keeps populations more dispersed and the fall transition is less abrupt.

Which Crickets Are Getting Into Ellensburg Homes

Washington has several cricket species, but three account for the overwhelming majority of household encounters here: the house cricket, the field cricket, and the spider cricket (also called the camel cricket). WSU Extension’s PestSense program identifies house crickets and field crickets as the two primary home-invading species in the state.

• House cricket (Acheta domesticus): Yellowish-brown, about 3/4 inch long, and the source of the persistent chirping you hear at night. House crickets can survive indoors indefinitely, which means a small group in a wall void or basement can become a full infestation within weeks.
• Field cricket (Gryllus spp.): Black, slightly larger at up to one inch, and a strong flier. Field crickets don’t successfully reproduce indoors, but they arrive in high numbers during the fall migration and are difficult to clear out without treating the perimeter.
• Spider cricket / camel cricket: Humpbacked, silent, and drawn to damp, dark spaces like basements, crawl spaces, and utility rooms. They don’t chirp, so homeowners often discover them visually, sometimes finding dozens in a single room.

The Real Damage Crickets Do Inside Your Home

Most people write crickets off as a nuisance. The damage they do while inside is less obvious but more lasting. House crickets feed on wool, nylon, silk, cotton, linen, leather, and rubber, with a strong preference for garments stained by perspiration or food residue. Seasonal clothing packed away in closets and storage bins is most at risk. A cricket working through a stored sweater or leather bag won’t leave obvious tracks, and the damage often isn’t found until the item is pulled out months later.

Sleep disruption is the other complaint we hear consistently. Male crickets chirp at night while searching for mates, and a single cricket hiding behind an appliance or inside a wall void can produce enough noise to keep a household awake. In enclosed spaces like crawl spaces and garages, large die-offs create odor problems and attract secondary scavenger pests, extending the problem well past the initial infestation.

What Draws Crickets to Your Property Before They Come Inside

Indoor infestations don’t start indoors. Crickets spend weeks staging near the structure before they enter, and several common property conditions make your home more attractive than your neighbor’s.

Exterior Lighting
Bright white outdoor lights near doors and windows are among the strongest cricket attractors. Switching to yellow or amber bulbs and repositioning fixtures away from doorways reduces that pull significantly.

Foundation-Level Habitat
Wood piles, leaf litter, and overgrown vegetation stacked against the foundation give crickets a sheltered staging area just feet from the structure. During Ellensburg’s dry August, these spots retain moisture that crickets actively seek. Moving firewood several feet from the foundation and keeping vegetation trimmed back removes that habitat before the fall migration begins.

Food Sources Near the Structure
Pet food left outside overnight, accessible garbage, and open compost keep crickets foraging close to the building for weeks before temperatures drop. Eliminating those sources removes the incentive to congregate near your foundation in the first place.

Steps Homeowners Can Take to Reduce Cricket Pressure

Physical exclusion is the most reliable DIY defense, and it works best when done before late summer rather than after crickets are already active. WSU Extension specifically recommends ensuring windows are properly screened and door thresholds fit tightly with no gaps along the base. Foundation cracks and gaps around utility penetrations are the other common entry corridors worth sealing with caulk or weatherstripping before August.

Inside, the step most homeowners overlook is storage. Seasonal clothing, wool items, and stored fabrics packed in cardboard boxes are vulnerable; sealed plastic bins close that pathway entirely. Dehumidifying damp basements and crawl spaces also makes your home less hospitable to spider crickets. These measures meaningfully reduce pressure, but exclusion alone can slow the rate of entry. It can’t address the perimeter population driving it.

When DIY Prevention Isn’t Enough

WSU Extension recommends contacting a pest management professional for established indoor infestations and explicitly notes that outdoor pesticide applications aren’t a recommended approach for homeowner self-treatment. The more effective window is the weeks before the fall migration, when perimeter treatment and a preventative maintenance program can reduce the cricket population around your structure before the September temperature drop sends them searching for entry points. Reactive treatment after crickets are already inside is harder, slower, and more disruptive than addressing the problem at the perimeter.

Because Ellensburg’s cricket season follows a consistent annual pattern, it’s also manageable in a way that many pest problems aren’t. The timing is known. The entry points are identifiable. The attractants are manageable. If you’re already hearing crickets or want to get ahead of the peak, Prosite can help. Reach out to us at (509) 478-1925 to talk through your options.