The short version
Around Irvine, mosquito season runs from about March into November. Treatment means removing water and treating what you can't drain. A barrier spray follows every few weeks.
- Dump standing water every week.
- Daytime biters are usually tiger mosquitoes.
- Barrier sprays last about three to four weeks.
- Larvicide handles water you can’t drain.
- Use repellent with DEET, picaridin or IR3535.
Anyone in Irvine tired of mosquito bites at home.
What to look for
In summer heat, eggs become biting adults in about a week. Mosquitoes breed in standing water, even a bottle cap's worth. Often the source is a neighbor's yard or a storm drain.
- 1Adults resting under deck boards or in ivy.
- 2A sump pit or crawl space holding water.
- 3Egg rafts floating on stagnant water.
- 4Welts on ankles and calves after yardwork.
- 5Whining near your ears at night indoors.
- 6Swarms rising from shrubs when you brush past.
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 📅
Mosquito activity through the year in Irvine
Spring
the first wave arrives early in Irvine. Start treatments then.
Summer
with highs near 83°F in Irvine, check water twice a week.
Fall
numbers stay high. Keep gutters clear of leaves.
Winter
a good time to fix drainage and low spots.
Treatment options and typical costs
Property Inspection for Breeding Sites
$0–$150 (often bundled with a first treatment)
Resting spots get a look as well: thick shrubs, ivy, the space under decks and shady fence lines around your Irvine home. Knowing where adults hide shows where barrier spray matters.
- Time
- 30–60 minutes
- Best for
- Every yard; finds where mosquitoes actually breed
Source Reduction and Larviciding
$75–$150 per visit
This visit often doubles as homeowner coaching, since most breeding sites on an Irvine lot can be eliminated by hand. A pro points them out so they stay gone.
- Time
- 45–90 minutes
- Best for
- Yards with standing water, clogged gutters, ponds, or drains
Barrier (Residual) Yard Treatment
$75–$200 per visit; $350–$900 per season
Most programs use a pyrethroid spray from a backpack mister. It fades over three to four weeks. Repeat visits keep the coverage up through the season.
- Time
- 20–45 minutes per visit, repeated every 3–4 weeks
- Best for
- Shaded yards with shrubs, ivy, and dense landscaping
Misting Systems and In2Care-Style Stations
misting $2,000–$4,500 installed plus refills; stations $200–$500 per season
Stations suit small Irvine 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
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.How mosquito treatment works in Irvine.
First, find and remove the water where they breed. Then spray where the adults rest. Across Irvine, the season runs from about March into November, so a plan usually starts in spring and runs to the end of the season. Larvicide handles water you can't drain, like ponds or drains. Barrier spray covers shady shrubs and leaves. Treatment has two parts.
Which mosquitoes bite around Irvine.
Near the coast, salt-marsh mosquitoes can fly into Irvine from miles away. Asian tiger mosquitoes are common around Irvine. They're black-and-white and bite by day. They breed in small containers. Yellow fever mosquitoes live around Irvine too. They also bite by day, often near or inside homes. House mosquitoes (Culex) bite from dusk into the night. They breed in storm drains. They're the main West Nile carriers.
Mosquitoes that bite indoors usually slip in through gaps around doors or torn window screens.Mosquito season in Irvine.
That's a long season. Plan on regular visits. West Nile cases usually peak in late summer.
A year of mosquitoes in Irvine.
- Spring: the first wave arrives early in Irvine. Start treatments then. - Summer: with highs near 83°F in Irvine, check water twice a week. - Fall: numbers stay high. Keep gutters clear of leaves. - Winter: a good time to fix drainage and low spots.
The weekly water walk.
- 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. - Tree holes: fill them with sand. - Gutters: clear leaves so water drains.
Avoiding bites.
- 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. - Timing: tiger mosquitoes bite by day; house mosquitoes at dusk. - Repellent: DEET, picaridin, IR3535 or oil of lemon eucalyptus.
Low-cost ways to cut mosquitoes.
- 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. - Lights: yellow bug lights attract fewer insects to the porch. - Mosquito dunks: Bti tablets kill larvae in rain barrels and ponds.
Mosquito or look-alike?
- Non-biting midges: swarm near water at dusk. Harmless, just annoying. - No-see-ums: tiny biting gnats near marshes. Screens need a finer mesh. - Mosquitoes: slim, long legs, and a needle-like mouth. - Crane flies: look like giant mosquitoes. They don’t bite.
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.
Heartworm reaches dogs through mosquito bites, and cats can get it as well; Irvine's June–October season is long enough that most vets advise year-round prevention. Talk to your vet about year-round prevention. Refresh pet water bowls daily; in dry Irvine a bowl or an irrigation puddle is often the only standing water on the block. Keep animals inside until a yard treatment dries.
What a treatment visit looks like.
Then they spray shady shrubs, where adults rest. Most plans repeat every three to four weeks. 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.
Rain barrels and ponds.
- 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. - Pool covers: drain standing water after rain. - Barrels: cover openings with fine mesh.
Questions to ask before you sign.
- 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? - When can kids and pets go back outside? - What product will you spray?
What affects the price
- One-time visit versus a seasonal plan.
- Lot size and total acreage treated.
- Misting system installation and refills.
- In2Care-style station count and servicing.
- Commercial or multi-unit property.
- Local labor rates and licensing costs.
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What's your biggest concern about mosquitoes?
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
They also spray where adults rest, every few weeks. A pro adds larvicide for water you can't drain. Use repellent and run a fan on the patio. The biggest win is free: dump standing water every week.
Mosquitoes in Irvine
Across Irvine, most of the housing is urban, so the usual entry points, moisture spots, and sheltered areas near the structure are what an inspection checks first. Across Irvine, 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 Irvine and California can point out the specific conditions that matter most here before you commit to a plan. Across Irvine, before you book, ask whether the inspection is included, what the treatment plan covers, how many visits to expect, and what the written quote includes. Across Irvine, getting the scope, the prep steps, and any follow-up terms in writing makes it much easier to compare providers fairly, and a good provider will walk you through each of these without pressure. Irvine only gets about 14 inches of rain a year, so local mosquitoes breed where people add water: sprinklers, pools, fountains and AC drips. Summer highs around 83°F in Irvine speed up the life cycle, and average humidity near 67% keeps adults active. In denser parts of Irvine, storm drains, catch basins and gutters are big breeding spots. Irvine has a mediterranean climate, and mosquitoes activity here tends to pick up late spring through early fall; year-round in the deep south.
Local research
Mosquitoes in Irvine, 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 Irvine, 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 Irvine
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
- Book barrier treatments before the season starts.
- Tighten lids on trash and recycling bins.
- Trim shrubs and ivy to reduce resting cover.
- Talk with neighbors about shared breeding sites.
- Empty plant saucers after every rain.
- Screen or lid every rain barrel.
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?
Over 3,500 mosquito species exist worldwide
Larvae are called wrigglers; pupae are tumblers
Questions people ask
What are In2Care stations and do they work?
Mosquitoes visit, then carry larvicide to other water. They work best against container breeders like tiger mosquitoes. They're small water traps.
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.
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.
Why are there so many mosquitoes in my yard specifically?
Usually there's water nearby, like a clogged gutter or tarp. Shady, damp plants give them a place to rest.
What is the difference between larvicide and barrier spray?
Barrier spray goes on leaves where adults rest. Most plans use both. It stops larvae from maturing.
When is mosquito season in Irvine?
It runs from about March into November. Daytime biters are tiger mosquitoes; evening biters are usually house mosquitoes.
Do mosquitoes in Irvine 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
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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