Whittier Pest Activity Calendar: What to Watch Through the Year

Winter and cooler periods

Rodents may become more noticeable indoors when shelter and food inside buildings are attractive. Rain or irrigation can also shift ant and cockroach activity. This is a good time to inspect roof vents, garage gaps, door seals and stored-food areas rather than waiting for obvious infestation.

Spring transition

As temperatures rise, ant foraging and mosquito development can increase where moisture is available. Check irrigation, plant saucers, gutters and containers. Termite swarm timing depends on species and weather, so any indoor swarmers should be identified rather than dismissed as seasonal insects.

Warm summer conditions

Drywood termite swarmers can become noticeable during warm periods, while Argentine ants may shift indoors for water and food. Mosquito pressure can remain high around irrigated yards and containers. Cockroaches may also move between exterior harborage and buildings.

Late summer and fall

Termite swarms can continue depending on species and weather. Roof rats may exploit fruiting trees and roof access, and cooler nights later in the season can increase interest in indoor shelter. This is a practical time to inspect tree-to-roof contact and exclusion points.

Use evidence, not the calendar, to decide when to act

If you find termite pellets, mud tubes, rodent droppings, German cockroach nymphs, bed bug evidence or persistent mosquito breeding sources, do not wait for a “better season.” The calendar is a planning tool, not a diagnosis.

Start with the service directory or pest inspection page when you are unsure what the evidence means.