Olympia, Washington · Family-owned since 1963
Olympia Pest Control & Exterminator Services
You want the rain to be the only thing coming down the windows. No ant line under the sink in May, no spider webs across the porch in September, no mice behind the dryer once November sets in. Our Olympia office treats the pests South Sound homes get on a year-round schedule, and comes back as part of your plan if they return between visits.
- Plans from $39/mo plus a one-time setup fee
- Re-services included as needed between scheduled visits
- QualityPro certified, licensed in Washington
Request a Free Quote
You can also call us at 360-526-8004 or Book Instantly Here
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Same-day callback Monday to Friday for requests sent before 4pm.
What are you dealing with?
Pick the pest to see how our Olympia team handles it: what it looks like, why it shows up in South Sound homes and what treatment involves.
Rats & mice
Norway rats under decks and sheds, roof rats in attics, deer mice in garages and outbuildings.
Busiest: SeptemberOlympia rodent control →Ants
Odorous house ants along counters and sinks, carpenter ants in damp wood and stumps.
Calls run Mar to AugOlympia ant control →Spiders
Orb webs across windows and porches, and giant house spiders in tubs and on floors.
Peak calls: SeptemberOlympia spider control →Wasps & yellow jackets
Ground nests in lawns, paper wasps under eaves and yellow jackets in wall voids.
Peak calls: JulyOlympia wasp control →Also in Olympia: boxelder bugs, stink bugs, termites, bed bugs, cockroaches and fleas.
Why South Sound homes see the pests they do
Olympia is wet most of the year and dry for a short stretch in summer. NOAA’s 1991 to 2020 climate normals for Olympia Airport put annual rain at 50.62 inches, with November, December and January the wettest months and July and August the driest. The typical first fall freeze comes around October 14.
That calendar shows up in our calls. Ants and wasps run through the dry months, spiders peak as summer ends, and rats and mice stay on the schedule all year, with September as their busiest month.
It adds up. You wipe up the ants, you knock down the webs, you set a trap in the garage and wonder whether it worked.
With a plan, that is our job. Your technician treats ahead of each pest’s season, and if something gets through between visits, one call brings us back, included in your plan.
Common Olympia pest problems and what we do about them
These are the calls our Olympia office takes most. Each one starts with an inspection, because the right fix depends on what is actually there.
When rats move under the deck or into the attic
WSU says Washington has two main rats: the Norway rat, which nests under buildings, woodpiles and junk, and the roof rat, a climber that uses attics, walls and vine-covered fences. Olympia’s own rat control code asks residents to keep garbage covered and to store lumber and boxes at least 18 inches off the ground. We inspect, set traps and locked bait stations, and quote sealing for the gaps we find.
Rodent control in Olympia →When deer mice get into the garage or the shop
The Washington State Department of Health says deer mice live throughout the state and carry hantavirus, and that mice fit through openings a quarter of an inch wide. DOH advises airing out a space and soaking droppings with a bleach solution rather than sweeping them up. For a heavy infestation, DOH says to call a professional, which is where we come in.
Rodent control in Olympia →When ants trail along the counter in spring
WSU calls odorous house ants perhaps the most difficult ants in our area to discourage. They are tiny, nest shallow in soil and move often, and come indoors for sweets and dairy. Large black ants and sawdust point to carpenter ants instead, which need a different treatment.
Ant control in Olympia →When the big spiders show up in the bathtub
WSU says giant house spiders are common in homes west of the Cascades, that they outnumber hobo spiders around Puget Sound, and that their bite is not known to threaten people. They are seen most from mid-summer to early fall, when males wander. We sweep webs and egg sacs at each exterior visit and treat where spiders hide.
Spider control in Olympia →When yellow jackets nest in a wall or the lawn
WSU says yellow jackets frequently build nests in wall voids or attics, sometimes chew through into rooms, and get aggressive in late summer and fall. Thurston County’s own wasp fact sheet recommends a professional for underground nests and for nests that could let wasps into an attic or crawl space.
Wasp control in Olympia →When you need a termite or WDO inspection
Buying or selling a home in Thurston or Lewis County usually means a wood-destroying organism inspection. We inspect for termites, carpenter ants and other wood-destroying insects, write up what we find, and quote any treatment after the inspection.
Termite and WDO inspections →
Your Olympia team
We hear from Olympia homeowners every week who have tried the spray from the hardware store and are tired of doing it again. Interstate Pest Management has been family-owned since 1963, and our Olympia office on Eastside Street serves Thurston County and Lewis County with the same plans and the same technician training as our other four offices.
Our customers give us a 4.96 average across 8,394 Google reviews. We’re QualityPro certified and licensed by the Washington State Department of Agriculture, and five years of South Sound service records tell us when each pest shows up, so your visits land ahead of it.
Our re-service promise
If pests come back between your scheduled visits, so do we, and the visit is included in your plan.
Pest Control Pricing in Olympia
Every plan has one monthly price and a one-time setup fee for the first treatment. If pests come back between scheduled visits, so do we, and the visit is included in your plan.
All Seasons Pest Service
$39/mo
$260 one-time setup fee
Year-round coverage for the insects Olympia homes see most, including ants, spiders, wasps and boxelder bugs.
See the Pest planAll Seasons Pest & Rodent Service
$47/mo
$280 one-time setup fee
Everything in the Pest plan plus rats and mice, on one bill.
See the Pest & Rodent planAll Seasons Rodent Service
$39/mo
$280 one-time setup fee
Ongoing rat and mouse control for homes that need rodent coverage only.
See the Rodent planOne-time Rodent Service: no plan, $350 for the first visit, then $60 per follow-up.
Exclusion work is quoted separately and carries a 1-year warranty on materials.
How Olympia service works, in 3 steps
- 1
Book online or call
Tell us what you’re seeing and where. Our Olympia office sets up your first visit.
- 2
Inspection and first treatment
Your technician checks the foundation, eaves, garage, crawl space and attic access, finds where pests get in and what draws them, treats the problem and shows you what was done.
- 3
Scheduled visits, re-services included as needed
Visits follow the South Sound pest calendar below, landing before each pest’s busy months. Anything that shows up in between gets a return visit included in your plan.
Local Context: Olympia and the South Sound
In Olympia, September is spider month and rat month.
Interstate Pest Management records for new customers in Thurston, Lewis and Mason counties over the last five years show September as the busiest month for two pests at once. September brought 28% of the year’s new spider calls and 16% of new rat and mouse calls, more than any other month for either one.
The public sightings line up. iNaturalist records for Thurston and Lewis counties over the last five years put 82% of cross orbweaver sightings in August through October, the season when the big round webs fill porches and windows, and September is the top month for giant house spider sightings. The rodents are a different story: rats and mice show up in our calls every month of the year, and September is when the numbers jump.
The other pests keep their own calendar. Ant calls ran March through August (83% of the year), wasp and yellow jacket calls peaked in July at 28%, and boxelder bug calls came in two waves, March (29%) and October (35%), as the bugs leave their winter shelter and then look for it again.
Be ready before September. Start a plan now and your visits land ahead of the late-summer spider and rodent rush, with re-services included as needed between visits.
Book NowShare of each pest’s first-time calls by month. Source: Interstate Pest Management service records, first appointments of new customers with Thurston, Lewis and Mason County billing addresses over the last five years. Each row sums to about 100%.
What Thurston and Lewis County neighbors log most
iNaturalist is a public site where people post photos of the insects and spiders they find, and other users confirm the ID. Cross orbweavers top this list for Thurston and Lewis counties over the last five years, with 501 verifiable sightings. They are harmless garden spiders, and their webs are what most people mean by “spider season” around Olympia.
Brown marmorated stink bug sightings in the two counties peak in October, with 33% of the year’s sightings in that one month. That is when they look for a way into the house for the winter. Sealing gaps around windows, doors, vents and the foundation before October keeps most of them out.
| Insect or spider | Sightings | Peak month |
|---|---|---|
| Cross orbweavers | 501 | September |
| Stink bugs (all species) | 463 | October |
| Giant house spiders | 299 | September |
| Boxelder bugs | 279 | October |
| Brown marmorated stink bugs | 242 | October |
| Paper wasps | 154 | July |
| Yellow jackets | 145 | August |
| Carpenter ants | 98 | May |
What the state is watching in Thurston County
The Washington State Department of Agriculture treated 2,303 acres in Thurston and Skagit counties for spongy moth in May 2024, including the Steamboat Island area, after moths were found there in 2023. The treatment used Btk, which WSDA says affects only caterpillars. Spongy moth is a tree pest, and we don’t treat trees.
If you see a very large wasp, it is almost always a native yellow jacket or bald-faced hornet. WSDA declared the northern giant hornet eradicated from Washington at the end of 2024, and it was only ever found in Whatcom County. WSDA asks residents to report suspected invasive hornets at 1-800-443-6684. Emerald ash borer, a beetle that kills ash trees, was confirmed in Vancouver in August 2026. It has not been reported in Thurston or Lewis County.
What our customers say
4.96 average from 8,394 Google reviews
“Interstate Pest has been great, our tech has been fantastic working through our mice and bug issues. He is very knowledgeable and experienced about the pests and the treatments he is using. The prices are reasonable and the customer service has been great.”
“Scott is great! I’m a first time homeowner and feel peace of mind knowing my home is rodent and pest free!”
“The technician performed a great job! He was very friendly and professional! We have not had any spiders hanging around the exterior of the house or jn the house since we started our service!”
Serving Olympia, Thurston County and Lewis County
Same team, same plans and same re-service promise across Olympia, Lacey and Tumwater, out to Yelm, Tenino, Rochester, Rainier and south through Lewis County to Centralia, Chehalis, Toledo, Winlock and Napavine. Wooded lots and older neighborhoods around Olympia come with stumps, woodpiles and beauty bark beds, which WSU names among the places carpenter ants nest before they move into a house. Farm and rural properties in both counties bring barns, shops and feed storage, and those are where we look first for rodents.
ZIP codes we serve: 98501, 98502, 98503, 98506, 98512, 98513, 98516, 98576, 98579, 98589, 98597, 98522, 98531, 98532, 98565, 98570, 98582, 98591, 98593 and 98596. Not on the list? Call 360-526-8004 and we’ll confirm your address.
Olympia pest control questions
Still deciding? Our Olympia office answers the phone Monday to Friday, 8am to 5pm.
How much does pest control cost in Olympia?
The All Seasons Pest Service is $39/mo with a $260 one-time setup fee. The All Seasons Rodent Service is $39/mo with a $280 setup fee, and the All Seasons Pest & Rodent Service is $47/mo with a $280 setup fee. The One-time Rodent Service is $350 for the first visit, then $60 per follow-up. Exclusion work is quoted separately.
When is pest season in Olympia?
All year, with different pests in different months. In Interstate Pest Management records for new customers in Thurston, Lewis and Mason counties over the last five years, ant calls ran March through August, wasp and yellow jacket calls peaked in July, and spider and rodent calls both peaked in September.
Why are there so many spider webs in September?
Most of the big round webs are cross orbweavers, a harmless garden spider. iNaturalist records for Thurston and Lewis counties over the last five years put 82% of their sightings in August through October. WSU says giant house spiders are also seen most from mid-summer to early fall, when males wander indoors.
Are hobo spiders dangerous?
WSU says recent research has not shown the hobo spider to be harmful to people, and that giant house spiders, which are often mistaken for hobo spiders, outnumber them around Puget Sound. Western black widows are rare here: shiny black with a red hourglass underneath. Leave one alone and give us a call.
What if pests come back between visits?
Call us. Re-service between scheduled visits is included on every All Seasons plan.
How fast will someone get back to me?
Quote requests sent before 4pm, Monday to Friday, get a call back from our Olympia office the same day.
Where can I get a garden pest identified?
For plant and garden pests, the WSU Thurston County Master Gardener clinic answers questions by email at master@co.thurston.wa.us, with photos, and the WSU Lewis County Plant & Insect Clinic at 17 SW Cascade Ave. in Chehalis takes insect samples Monday to Thursday, 9am to 3pm. For anything in or on the house, send us a photo and we’ll tell you what it is.
Do you treat mosquitoes?
Mosquitoes are a rare request for us, and neither county has a mosquito control district. The Washington State Department of Health’s West Nile virus data shows no mosquito or animal detections in Thurston or Lewis County in 2025. Emptying standing water in buckets, gutters and plant saucers each week does the most good.
Is there anything you don’t treat?
Ticks, moles, voles, wildlife and tree pests like spongy moth and emerald ash borer are outside what we do. Call anyway and we’ll suggest where to start.
Call our Olympia office
Interstate Pest Management
1107 Eastside St SE Ste E
Olympia, WA 98501
Monday to Friday, 8am to 5pm
Washington State Department of Agriculture License #229
Take the fast lane to a pest-free home.
Picture a spring without an ant line, a September without webs on every window and a winter with a quiet garage. One call sets up the whole year, with plans from $39/mo plus a one-time setup fee.