The short version
Most yard treatments in Seattle cost about $75–$200 per visit, or $350–$900 for a season. Removing standing water costs nothing and helps the most.
- A visit in Seattle usually costs $75–$200.
- A full season usually runs $350–$900.
- Removing standing water is free and helps most.
- Ask what happens if bites return between visits.
- Compare plans by visits and products, not just price.
Homeowners and renters in Seattle who want their yard back.
What to look for
Mosquitoes breed in standing water, even a bottle cap's worth. In summer heat, eggs become biting adults in about a week. Around Seattle, mosquito season runs from late May until the first frost. Often the source is a neighbor's yard or a storm drain.
- 1Rain barrels without screens or lids.
- 2Dogs testing positive for heartworm.
- 3Adults resting under deck boards or in ivy.
- 4Mosquitoes indoors resting on walls or in closets.
- 5Bites within minutes of stepping outside at dusk.
- 6A neighbor's pool turning green and untended.
Why it’s worth acting soon
- Each new generation is bigger than the last.
- Bites can spread West Nile virus.
- Itchy welts, especially for kids.
- Heartworm risk for dogs.
bite, to get protein for their eggsOnly female mosquitoesUS CDC in standing water, from a bottle cap to a pondMosquitoes breedUS EPA West Nile virus is the most common mosquito-borne disease in the U.S.Mosquito diseasesUS CDC 🧮
Estimate a season of mosquito control in Seattle
Adjust for your situation to see a ballpark range.
Estimated range
A rough guide only. Your quote depends on your yard and how many visits you need.
Treatment options and typical costs
Property Inspection for Breeding Sites
$0–$150 (often bundled with a first treatment)
Across Seattle, a good inspection sets expectations too: a yard that backs onto a wetland won't respond like a dry cul-de-sac, and the pro should tell you that up front.
- Time
- 30–60 minutes
- Best for
- Every yard; finds where mosquitoes actually breed
Source Reduction and Larviciding
$75–$150 per visit
Larvicide hits mosquitoes before they can fly, which is why pros in Seattle build every plan around it. Adult spraying is the follow-up, not the fix.
- Time
- 45–90 minutes
- Best for
- Yards with standing water, clogged gutters, ponds, or drains
Monitoring and Seasonal Plans
$50–$150 per follow-up visit; $350–$900 per season bundled
Across Seattle, a seasonal plan usually combines a barrier spray every 3–4 weeks with larvicide checks and a final fall visit. Paying per season often beats paying per visit.
- Time
- 15–30 minutes per check; season runs spring through first frost
- Best for
- Anyone who wants the yard usable all summer
Barrier (Residual) Yard Treatment
$75–$200 per visit; $350–$900 per season
A barrier treatment coats the undersides of leaves, shrubs, and shaded surfaces where adult mosquitoes rest during the day around your Seattle home. Adults that land there pick up a lethal dose.
- Time
- 20–45 minutes per visit, repeated every 3–4 weeks
- Best for
- Shaded yards with shrubs, ivy, and dense landscaping
Prices are typical published ranges. Ask what’s included before you compare quotes.
A treatment visit covers the shaded plants and beds where adults rest, along with any standing water that can't be drained.What mosquito control costs in Seattle.
- Barrier (Residual) Yard Treatment: $75–$200 per visit; $350–$900 per season - A typical home in Seattle is worth around $850k, and a season of treatment costs far less than most outdoor projects. With a short season around Seattle, most plans cover four or five visits. - Property Inspection for Breeding Sites: $0–$150 (often bundled with a first treatment) - Source Reduction and Larviciding: $75–$150 per visit - Monitoring and Seasonal Plans: $50–$150 per follow-up visit; $350–$900 per season bundled
Local mosquitoes conditions in Seattle.
Across Seattle, the area is mostly urban, so mosquitoes pressure can differ from one block to the next depending on how tight the entry points are and how much food, water, or shelter is close by. An inspection in Seattle usually starts outside and works inward, checking the foundation, gaps around doors and windows, and any moisture or clutter near the structure first. Knowing Seattle's seasonal timing lets you schedule treatment before the busy stretch rather than after it, which usually means faster service and a more accurate quote. A provider who works Seattle and Washington every day can point out the specific conditions that matter most here, and getting the scope, price, and follow-up terms in writing makes it easier to compare options. Seattle sits in a marine west coast climate, and that sets the pace for mosquito activity here: late spring through early fall; year-round in the deep south.
Mosquitoes that bite indoors usually slip in through gaps around doors or torn window screens.Which mosquitoes bite around Seattle.
They breed in storm drains. They're the main West Nile carriers. Floodwater mosquitoes hatch in big waves after heavy rain or snowmelt. They can travel a long way from where they hatch. House mosquitoes (Culex) bite from dusk into the night.
Mosquito season in Seattle.
The season is short, but numbers can spike after rain. West Nile cases usually peak in late summer.
A year of mosquitoes in Seattle.
- Winter: store containers upside down and plan for spring. - Spring: clean gutters and dump water as snow melts. - Summer: short but busy in Seattle. Watch for swarms after rain. - Fall: the first frost ends the season.
The weekly water walk.
- Tree holes: fill them with sand. - Gutters: clear leaves so water drains. - Saucers and pots: empty them or add sand. - Toys and buckets: store them upside down. - Tarps and covers: pull them tight so water runs off. - Birdbaths: change the water twice a week. - Pet bowls: refresh daily. - AC drip lines and downspouts: make sure water drains away.
Avoiding bites.
- Timing: tiger mosquitoes bite by day; house mosquitoes at dusk. - Repellent: DEET, picaridin, IR3535 or oil of lemon eucalyptus. - Clothing: long sleeves and pants help at dusk. - Fans: a patio fan keeps weak-flying mosquitoes away. - Screens: repair holes in window and door screens.
Low-cost ways to cut mosquitoes.
- Lights: yellow bug lights attract fewer insects to the porch. - Mosquito dunks: Bti tablets kill larvae in rain barrels and ponds. - Mosquito fish: they eat larvae in ornamental ponds. - Pumps and fountains: moving water breeds far fewer mosquitoes. - Trimming: thin out dense shrubs and tall grass.
Mosquito or look-alike?
- Mosquitoes: slim, long legs, and a needle-like mouth. - Crane flies: look like giant mosquitoes. They don’t bite. - Non-biting midges: swarm near water at dusk. Harmless, just annoying. - No-see-ums: tiny biting gnats near marshes. Screens need a finer mesh.
When a bite needs a doctor.
Most people infected with West Nile virus never feel sick. About one in five get a fever, headache or body aches. See a doctor for high fever, stiff neck or confusion. Spreading swelling or an infected-looking bite needs a check too. Most bites just itch for a few days.
Protecting your pets.
Talk to your vet about year-round prevention. Refresh pet water bowls daily, dump saucers after Seattle's summer storms, and keep animals inside until a yard treatment dries. Heartworm reaches dogs through mosquito bites, and cats can get it as well; Seattle's June–October season is long enough that most vets advise year-round prevention.
What a treatment visit looks like.
The tech walks the yard first. They dump or treat standing water. Larvicide goes in water you can't drain. Then they spray shady shrubs, where adults rest. Most plans repeat every three to four weeks. A visit usually takes 20 to 45 minutes.
Rain barrels and ponds.
- Pool covers: drain standing water after rain. - Barrels: cover openings with fine mesh. - Ponds: fish and moving water keep larvae down. - Bird baths: change the water every few days. - Gutters: clear them so water drains away. - Tarps: shake out any that hold rainwater.
Questions to ask before you sign.
- When can kids and pets go back outside? - What product will you spray? - How often will you come? - Do you treat standing water too? - What happens if bites come back between visits? - How do you protect bees and flowers?
Ways to keep the cost down.
- Book early. Spring sign-ups sometimes cost less. - Dump standing water every week. It’s free and works. - Trim dense shrubs so fewer adults can rest there. - Ask about a shorter plan for peak months only. - Compare what each plan includes, not just the price.
What affects the price
- Commercial or multi-unit property.
- Ponds, creeks, or wetland edges on the property.
- One-time visit versus a seasonal plan.
- Misting system installation and refills.
- Number of visits the local season needs.
- Amount of shade and dense vegetation.
- Lot size and total acreage treated.
- Synthetic versus botanical barrier products.
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What's your biggest concern about mosquito control costs?
When to call for help
early in the season, before the first big wave. Ponds, drains and dense shrubs are hard to handle yourself. Call if bites still keep you indoors. Dumping water should come first.
What you can do yourself
A pro adds larvicide for water you can't drain. They also spray where adults rest, every few weeks. The biggest win is free: dump standing water every week. Use repellent and run a fan on the patio.
Mosquitoes in Seattle
With about 38 inches of rain a year in Seattle, any container left out will hold water within days. Summer highs around 76°F in Seattle speed up the life cycle, and average humidity near 73% keeps adults active. In denser parts of Seattle, storm drains, catch basins and gutters are big breeding spots.
Local research
Mosquitoes in Seattle, WA: what the public record shows
Before you compare quotes, it helps to know which mosquitoes actually live in Washington, when they are busiest around Seattle, and what the state figures look like. Everything below links to the agency or university page it came from.
West Nile neuroinvasive disease cases, 2024
Neuroinvasive counts are the most reliable state comparison because nearly all severe cases are diagnosed and reported.
CDCWhen mosquitoes are busiest around Seattle
Washington DOH: detections from May (earliest) to October (latest). California reports its heaviest WNV activity in late summer; CDC peak is late August to early September.
Rules that apply in Washington
For context, nationally
- 1,808 — West Nile virus disease cases reported, 2024. CDC
- 1,347 (75% of cases); 173 deaths — West Nile neuroinvasive disease cases, 2024. CDC
Sources: CDC; Washington State Department of Health. Figures are quoted as the source prints them. How we check our sources
Simple ways to keep mosquitoes away
- Keep pools chlorinated and covered when unused.
- Flush tree holes or fill them with sand.
- Drop Bti dunks in water you cannot drain.
- Book barrier treatments before the season starts.
- Talk with neighbors about shared breeding sites.
When you compare quotes, look at the season total, how many visits it covers and what happens if the bites come back.Did you know?
Larvae are called wrigglers; pupae are tumblers
Over 3,500 mosquito species exist worldwide
Questions people ask
Why do mosquito quotes vary so much?
Companies use different products and visit on different schedules. Some include re-sprays. Compare what's included, not just the price.
How much does a single mosquito treatment cost?
Usually $75–$200 per visit. Bigger or shadier yards cost more.
Do companies charge extra for re-treatments between visits?
Some include a free re-spray within a set window. Others charge. Ask before you sign.
What does a seasonal mosquito plan cost?
Usually $350–$900 for the season. Around Seattle, the season runs from late May until the first frost, which sets how many visits you need.
How long does a mosquito treatment last?
A barrier spray usually lasts three to four weeks. Heavy rain can shorten that.
What does a mosquito inspection involve?
The tech walks the yard looking for standing water. They also check shady spots where adults rest. Gutters, saucers, tarps and low spots get checked first.
Do I need a seasonal plan or is one treatment enough?
One treatment helps for an event or a few weeks. Barrier sprays fade in three to four weeks. Steady relief takes repeat visits.
Should I worry about West Nile virus?
Across Seattle, yes, mosquitoes can transmit West Nile virus and other diseases, so control is about reducing both the nuisance and the risk. West Nile virus is the most common mosquito-borne disease in the U.S.
What do most homeowners do about yard mosquitoes?
Across Seattle, mosquito control works by removing standing water, treating the water that cannot be drained, and applying barrier treatments where adults rest. Across Seattle, because they keep breeding through the season, an ongoing plan usually works best.
When is mosquito season in Seattle?
It runs from late May until the first frost. Evening biters are usually house mosquitoes.
Do mosquitoes in Seattle carry West Nile?
They can. West Nile is found in every lower-48 state, Washington included. Cases usually peak in late summer. Repellent and dumping standing water are your best protection.
Nearby cities
Related guides
Sources (11)
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 Mosquito Exterminator · Updated September 11, 2026 · How we write these guides