The short version
Most yard treatments in San Mateo cost about $75–$200 per visit, or $350–$900 for a season. Removing standing water costs nothing and helps the most.
- A visit in San Mateo 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.
Anyone in San Mateo tired of mosquito bites at home.
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 San Mateo, mosquito season runs from about March into November. Often the source is a neighbor's yard or a storm drain.
- 1Mosquitoes indoors resting on walls or in closets.
- 2A neighbor's pool turning green and untended.
- 3Dogs testing positive for heartworm.
- 4Ornamental pond with no fish or pump.
- 5Swarms rising from shrubs when you brush past.
- 6Whining near your ears at night indoors.
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 San Mateo
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)
Expect a written or verbal summary of what was found on your San Mateo property, including problems on the neighbor's side of the fence. You cannot treat next door, but you can plan around it.
- Time
- 30–60 minutes
- Best for
- Every yard; finds where mosquitoes actually breed
Monitoring and Seasonal Plans
$50–$150 per follow-up visit; $350–$900 per season bundled
A good pro checks landing counts between visits. Numbers climbing early means a missed breeding site.
- Time
- 15–30 minutes per check; season runs spring through first frost
- Best for
- Anyone who wants the yard usable all summer
Misting Systems and In2Care-Style Stations
misting $2,000–$4,500 installed plus refills; stations $200–$500 per season
Stations suit small San Mateo lots, townhome yards, and properties where the owner would rather not have spray. They work slowly, so pair them with source reduction.
- Time
- Misting: half a day. Stations: under an hour.
- Best for
- Specific yards: heavy outdoor use or spray-averse owners
Barrier (Residual) Yard Treatment
$75–$200 per visit; $350–$900 per season
Crews should skip blooming plants and vegetable beds when spraying a San Mateo property to protect bees and food crops. A careful applicator treats resting cover, not the whole yard.
- 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.
Adult mosquitoes spend the day in shady, leafy beds like this one, so that's where a barrier treatment goes.What mosquito control costs in San Mateo.
- Monitoring and Seasonal Plans: $50–$150 per follow-up visit; $350–$900 per season bundled - Misting Systems and In2Care-Style Stations: misting $2,000–$4,500 installed plus refills; stations $200–$500 per season - Barrier (Residual) Yard Treatment: $75–$200 per visit; $350–$900 per season - A typical home in San Mateo is worth around $1,450k, and a season of treatment costs far less than most outdoor projects. With a season running from about March into November around San Mateo, most plans cover seven or eight visits. - Property Inspection for Breeding Sites: $0–$150 (often bundled with a first treatment)
Local mosquitoes conditions in San Mateo.
San Mateo sits in a mediterranean climate, and that sets the pace for mosquito activity here: late spring through early fall; year-round in the deep south. For San Mateo homes, 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 San Mateo usually starts outside and works inward, checking the foundation, gaps around doors and windows, and any moisture or clutter near the structure first. Knowing San Mateo'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 San Mateo and California 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.
Mosquitoes that bite indoors usually slip in through gaps around doors or torn window screens.Which mosquitoes bite around San Mateo.
They're black-and-white and bite by day. They breed in small containers. House mosquitoes (Culex) bite from dusk into the night. They breed in storm drains. They're the main West Nile carriers. Near the coast, salt-marsh mosquitoes can fly into San Mateo from miles away. Asian tiger mosquitoes are common around San Mateo.
Mosquito season in San Mateo.
That's a long season. Plan on regular visits. West Nile cases usually peak in late summer.
A year of mosquitoes in San Mateo.
- Fall: numbers stay high. Keep gutters clear of leaves. - Winter: a good time to fix drainage and low spots. - Spring: the first wave arrives early in San Mateo. Start treatments then. - Summer: with highs near 78°F in San Mateo, check water twice a week.
The weekly water walk.
- 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. - 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.
Avoiding bites.
- Screens: repair holes in window and door screens. - 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.
Low-cost ways to cut mosquitoes.
- Trimming: thin out dense shrubs and tall grass. - 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.
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.
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. Most people infected with West Nile virus never feel sick.
Protecting your pets.
Ask your vet about year-round heartworm prevention. Change pet water bowls daily. Keep pets inside while a yard spray dries. Dogs get heartworm from mosquito bites. Cats can too.
What a treatment visit looks like.
A visit usually takes 20 to 45 minutes. 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.
Rain barrels and ponds.
- Gutters: clear them so water drains away. - Tarps: shake out any that hold rainwater. - 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.
Questions to ask before you sign.
- What happens if bites come back between visits? - How do you protect bees and flowers? - When can kids and pets go back outside? - What product will you spray? - How often will you come? - Do you treat standing water too?
Ways to keep the cost down.
- Compare what each plan includes, not just the price. - 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.
What affects the price
- Ponds, creeks, or wetland edges on the property.
- One-time visit versus a seasonal plan.
- Local labor rates and licensing costs.
- Lot size and total acreage treated.
- Special-event timing and rush scheduling.
- Number of visits the local season needs.
- Gutter cleaning or drainage fixes bundled in.
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What's your biggest concern about mosquito control costs?
When to call for help
Call if bites still keep you indoors. Dumping water should come first. early in the season, before the first big wave. Ponds, drains and dense shrubs are hard to handle yourself.
What you can do yourself
The biggest win is free: dump standing water every week. Use repellent and run a fan on the patio. A pro adds larvicide for water you can't drain. They also spray where adults rest, every few weeks.
Mosquitoes in San Mateo
Summer highs around 78°F in San Mateo speed up the life cycle, and average humidity near 73% keeps adults active. In denser parts of San Mateo, storm drains, catch basins and gutters are big breeding spots. San Mateo only gets about 21 inches of rain a year, so local mosquitoes breed where people add water: sprinklers, pools, fountains and AC drips.
Local research
Mosquitoes in San Mateo, CA: what the public record shows
Before you compare quotes, it helps to know which mosquitoes actually live in California, when they are busiest around San Mateo, 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.
CDCMosquito species recorded in California
- Yellow fever mosquito (Aedes aegypti) — CDC lists Aedes aegypti as more likely than Ae. albopictus to spread dengue, Zika, and chikungunya; prefers human hosts and lives in and around homes. Tropical, subtropical, and…
When mosquitoes are busiest around San Mateo
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.
CDC lists California among states with limited local dengue spread from Aedes aegypti.
Rules that apply in California
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; California Department of Public Health / MVCAC; Potential Range of Aedes Mosquitoes. Figures are quoted as the source prints them. How we check our sources
Simple ways to keep mosquitoes away
- Rake leaf litter from shaded beds.
- Talk with neighbors about shared breeding sites.
- Replace corrugated downspout extensions with smooth pipe.
- Add fish or a pump to ornamental ponds.
- Check AC drip lines and sump pits.
- Drain kiddie pools when playtime ends.
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?
Tiger mosquitoes arrived in used tires in the 1980s
Mosquito means little fly in Spanish
Questions people ask
What does a seasonal mosquito plan cost?
Usually $350–$900 for the season. Around San Mateo, the season runs from about March into November, which sets how many visits you need.
Do companies charge extra for re-treatments between visits?
Others charge. Ask before you sign. Some include a free re-spray within a set window.
Does lot size really change the price that much?
Yes. More yard and more shrubs mean more product and more time.
Why do mosquito quotes vary so much?
Some include re-sprays. Compare what's included, not just the price. Companies use different products and visit on different schedules.
How do I choose a mosquito control company?
Ask what products they use and how often they visit. Ask what happens if bites come back. Check that they're licensed in California.
Is mosquito spraying safe for pets, kids, and bees?
Keep kids and pets inside until it dries. Ask them to avoid flowers. Applied by the label, it's considered low risk once dry.
Do I need a seasonal plan or is one treatment enough?
Barrier sprays fade in three to four weeks. Steady relief takes repeat visits. One treatment helps for an event or a few weeks.
Should I worry about West Nile virus?
For San Mateo homes, 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.
When is mosquito season in San Mateo?
It runs from about March into November. Daytime biters are tiger mosquitoes; evening biters are usually house mosquitoes.
Do mosquitoes in San Mateo carry West Nile?
Cases usually peak in late summer. Repellent and dumping standing water are your best protection. They can. West Nile is found in every lower-48 state, California included.
Nearby cities
Related guides
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 Mosquito Exterminator · Updated September 11, 2026 · How we write these guides