Termites in Washington

Termite Activity in Washington

Termites are active in almost all of the state of Washington, from Seattle to Spokane and from Olympia to Walla Walla, Washington. There are small portions in the northeast and northwest that are unlikely to have termite activity due to the climate.

What Types of Termites Are in Washington?

Subterranean termites are known to damage homes in Washington. The western drywood termite occasionally infests homes along the coast in Washington.

Dampwood termites also are common in Washington; however, dampwood termite are less likely to damage structures than subterranean and drywood termites.

Are Formosan Termites in Washington?

Formosan termites have not been identified in Washington.

When Do Termites Swarm in Washington?

Generally, termites swarm on a warm day after a rainfall. Swarms also may occur during the winter in heated buildings. The swarming habits of the most common species in Washington are described below.

• The western subterranean termite swarms during the day in the local rainy season in autumn, winter or early spring.

• The western drywood termite swarms in coastal Washington during the day in the summer.

• The Pacific dampwood termite typically swarms from August to October, just before dusk.

• The Nevada dampwood termite swarms around sunset in spring at higher elevations, and in summer and early fall in coastal areas.

More Information about Termites in Washington

According to Termite Infestation Probability Zones (TIP Zones), Washington is located in TIP Zone #3 (slight to moderate), which means there is some potential for damage by subterranean termites. Areas with lower probabilities for termite activity require fewer termite control measures to meet International Residential Code building standards for new homes than areas with more frequent activity.

In states like Washington where termites are active and widespread, it is essential to maintain an effective termite prevention and control program. If you own a home in Washington, talk to your termite control expert about methods to help protect your home from termite infestations and damage.