The short version
Most termite problems in Gresham are western subterranean termites, and the usual fix is a liquid soil treatment or bait stations. Start with an inspection; $75–$250 is typical.
- Look for mud tubes, shed wings and hollow-sounding wood.
- Swarms usually show up in spring.
- The usual fix is a soil barrier or bait stations.
- An inspection typically costs $75–$250.
- Insurance usually doesn’t cover termite damage.
Homeowners, landlords and anyone buying or selling a house in Gresham, whether you've spotted something or just want to know what to watch for.
What to look for
Termites work quietly. A colony can feed inside a wall for years. Average winter lows near 36°F slow termites near the surface around Gresham, but they move deeper and keep feeding under heated homes. Spongy floors or bubbling paint usually mean long-running damage. So it's worth an inspection, even for one or two signs.
- 1Screwdriver sinks easily into sills or trim.
- 2Live pale insects inside a broken mud tube.
- 3Mud tubes running up foundation walls or piers.
- 4Winged swarmers indoors, especially in spring.
- 5Dry hexagonal pellets under window frames or eaves.
- 6Piles of identical shed wings on windowsills.
Why it’s worth acting soon
- Colonies grow and spread every year they go untreated.
- Damage hides behind drywall, flooring and trim.
- Homeowners insurance usually doesn’t cover termite damage.
- An active infestation can complicate a home sale.
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Termite activity through the year in Gresham
Spring
swarm seasons. Across Gresham, swarms often follow the first warm days and the first fall rain.
Summer
with highs around 80°F in Gresham, termites follow moisture, so watch AC drain lines, sprinkler zones and hose bibs.
Fall
with about 44 inches of rain a year in Gresham, make sure gutters and downspouts carry water well away from the foundation.
Winter
a good time to book an inspection in Gresham, before swarm season starts.
Treatment options and typical costs
Termite Inspection and WDI Report
$75–$250
The inspector checks the foundation, garage, attic and damp spots. Bring up anything you’ve noticed.
- Time
- 60–120 minutes
- Best for
- Every job, real estate closings, and yearly peace of mind
Bait Station System with Monitoring
$1,500–$3,500 install, plus $300–$500 per year
Ask how many stations they plan for your Gresham home, how often they'll check them, and what the annual fee covers.
- Time
- 2–4 hours to install; checked quarterly
- Best for
- Colony elimination, wells and slabs, homes near water
Annual Renewal and Monitoring
$150–$400 per year
Renewal fees are small next to a second full treatment. For Gresham homeowners, the visit usually includes a walk-around, a crawl space check, and a bait station service.
- Time
- 30–60 minutes per visit
- Best for
- Keeping a treated home protected after the initial job
Fumigation for Drywood Termites
$1,200–$4,000 (often $1–$4 per square foot)
Tenting is mainly for drywood termites. Most homes here never need it.
- Time
- 2–3 days including tenting and aeration
- Best for
- Widespread drywood termites throughout a structure
Prices are typical published ranges. Ask what’s included before you compare quotes.
In a basement, the wooden sill plate on top of the block wall is the first piece of wood termites reach.How treatment works on a typical Gresham home.
They also treat around piers and plumbing. Fix any moisture under the house too. Bait stations are the other main option. They're spaced every 10 to 20 feet. Termites carry the bait back to the colony. The stations are checked on a schedule, often every few months. With a crawl space, the crew treats soil outside and underneath.
Which termites live around Gresham.
It nests in soil and builds mud tubes to reach wood. It needs steady moisture. The termite you're most likely to meet in Gresham is the western subterranean termite.
Subterranean termites don't stop in winter; they just go deeper. A quiet season is a good time for a non-urgent inspection.When termites swarm here.
Across Gresham, western subterranean termites usually swarm in spring, and again in fall after the first good rain. A swarm outside means a colony is nearby. A swarm inside usually means it's in the house. Save a few in a bag, or snap a clear photo. Swarm season is when termites show themselves.
Where to look around your house.
Take a flashlight underneath. Check the piers, the sill plate and the floor joists. Standing water or a musty smell needs fixing either way. The same advice applies across the area, from Gresham out to Oregon City and Portland. A lot of houses around Gresham are built over crawl spaces, and that's usually where termites start.
A year of termites in Gresham.
- Winter: a good time to book an inspection in Gresham, before swarm season starts. - Spring and fall: swarm seasons. Across Gresham, swarms often follow the first warm days and the first fall rain. - Summer: with highs around 80°F in Gresham, termites follow moisture, so watch AC drain lines, sprinkler zones and hose bibs. - Fall: with about 44 inches of rain a year in Gresham, make sure gutters and downspouts carry water well away from the foundation.
What happens at an inspection.
The inspector walks the outside of the house first. They check the foundation, the soil line and nearby wood. Inside, they check the garage, baseboards, plumbing gaps and the attic. They'll also go into the crawl space. A moisture meter and a probe help them find hidden activity. Afterward, ask them to show you what they found. Photos help. Most inspections take an hour or two.
Termites or ants?
- Tunnels: termite galleries are packed with mud. Ant tunnels are clean and smooth. - Wings: termite wings are all the same length. Ant wings aren’t. - Waist: termites are thick through the middle. Ants are pinched. - Antennae: termite antennae are straight. Ant antennae bend like an elbow. - Debris: termites leave mud. Carpenter ants leave sawdust.
Getting ready for treatment day.
Clear a walking path along the exterior walls. Move boxes away from garage walls. Flag sprinkler heads and buried lines. Keep kids and pets inside while the Gresham crew applies the product, and ask how long to stay off treated soil. In Oregon, pacific dampwood swarms late summer or fall; western subterranean may swarm any time of year (Oregon State). Drill holes in slabs or patios get patched afterward. Prep is light for liquid treatments and bait stations.
Mulch and termites.
A dry gap along the house makes mud tubes easier to spot; in Gresham that means extending downspouts and pulling mulch back from the slab. Wood chips touching the siding trap the moisture termites are after. Pull mulch back from the foundation and keep the layer thin.
Questions to ask before you sign.
- What do I need to do before and after treatment? - Which termites did you find, and where? - What product or system will you use? - Is the whole foundation treated, or just one spot? - What does the warranty cover, and for how long? - What does the yearly renewal cost?
What affects the price
- Amount of drilling through concrete and patios.
- Liquid barrier versus bait station system.
- Linear feet of foundation to be treated.
- Wells, drains, or water features limiting chemical use.
- Number of bait stations required.
- Time of year and how booked up local companies are.
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What's your biggest concern about termites?
When to call for help
Lenders often ask for one. It's also the cheapest termite service. Carpenter ants leave clean tunnels and sawdust. Termites leave mud. Call if you see mud tubes, pellets or an indoor swarm. Hollow-sounding wood is another clue. Buying or selling? Get a wood-destroying insect (WDI) report either way.
What you can do yourself
Treating an active colony is harder. The product has to reach the whole colony. It also needs even coverage around the entire foundation. Store-bought sprays usually kill only the termites you see. Some of the work is yours. Pull mulch back from the foundation. Fix leaks and clear gutters. Keep firewood away from the house.
Termites in Gresham
About 44 inches of rain a year in Gresham is plenty for subterranean termites, especially on any side of the house kept damp by gutters or sprinklers. Termites are a steady, moderate risk in Oregon. Not every house gets them, but plenty do. With summer highs around 80°F, Gresham's mediterranean climate decides when local termites are busiest. A typical home in Gresham is worth around $445k, which puts a few hundred dollars for an inspection and prevention in perspective. Gresham has a mediterranean climate, and termites activity here tends to pick up spring swarm season (March-May), warmer earlier in the south. Across Gresham, most of the housing is suburban, so the usual entry points, moisture spots, and sheltered areas near the structure are what an inspection checks first. Across Gresham, take a minute to note where you have seen activity and when it appears, so the inspection is faster and the quote more accurate. A local provider who knows Gresham and Oregon can point out the specific conditions that matter most here before you commit to a plan.
Local research
Termites in Gresham, OR: what the public record shows
Before you compare quotes, it helps to know which termites actually live in Oregon, when they are busiest around Gresham, and what the state figures look like. Everything below links to the agency or university page it came from.
Termite species recorded in Oregon
- Western subterranean termite (Reticulitermes hesperus) — Oregon State: causes damage to structures in the Pacific Northwest and 'may swarm any time of year'. Utah State describes swarmers 3/8 inch long and workers 1/4–3/8 inch, pale c…
- Pacific dampwood termite (Zootermopsis angusticollis) — Oregon State: 'consumes and nests inside moist, water-damaged wood'; swarms 'during late summer or fall'. A moisture problem, not a soil problem, is the usual root cause.
When termites are busiest around Gresham
Pacific dampwood swarms late summer or fall; western subterranean may swarm any time of year (Oregon State).
Oregon State: both species 'cause damage to structures in the Pacific Northwest'; control 'is best left to professional pest controllers'.
Sources: University of Georgia Extension; University of Missouri Extension; Termites | Solve Pest Problems. Figures are quoted as the source prints them. How we check our sources
Simple ways to keep termites away
- Trim shrubs so foundation walls stay visible and dry.
- Keep six inches between soil and siding or wood.
- Caulk gaps around plumbing and utility penetrations.
- Keep mulch at least a foot from the foundation.
- Address wood-to-soil contact at steps, fences, and trellises.
- Paint or seal exposed exterior wood.
An inspection starts outside, with a flashlight along the foundation line where mud tubes show up first.Did you know?
Some African termite mounds stand more than 25 feet tall.
Across Gresham, a termite queen can keep laying eggs for 25 years or more.
Questions people ask
What is the difference between subterranean and drywood termites?
Subterranean termites live in soil and build mud tubes. Drywood termites live inside the wood and leave tiny pellets. Around Gresham, the subterranean kind causes most problems.
How long does termite treatment take?
A liquid barrier takes half a day to a day. Bait stations take a few hours to install. Fumigation takes two to three days.
How do I know if I have termites or flying ants?
Check the wings and the waist. Termite wings are all the same length. Ants have a pinched waist; termites don't. Save one in a bag for the inspector.
Will termites come back after treatment?
They can. Treatments wear down and new colonies move in. That's what yearly inspections and renewal plans are for.
How do I choose a termite company?
Make sure they're licensed in Oregon. Ask which termites they found and what product they'll use. Ask what the warranty covers. Compare the proposals, not just the totals.
Is termite prevention cheaper than repairing termite damage?
Across Gresham, termites are best caught early through inspection, because the damage is hidden inside wood until it is far along. Across Gresham, a professional inspection looks for mud tubes, damaged wood, and swarming activity, and treatment targets the soil and the colony rather than just the visible wood.
Are termites common in Oregon?
Around Gresham, the usual culprit is the western subterranean termite.
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Sources (10)
The facts in this article come from the public sources listed above. Every home is different, so ask the company you talk to about pricing and what’s included. Published by Termite Exterminator · Updated September 11, 2026 · How we write these guides