The short version
Around Los Angeles, 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.
Homeowners and renters in Los Angeles who want their yard back.
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.
- 1Tarps, toys, or tires holding rainwater.
- 2A sump pit or crawl space holding water.
- 3Being bitten in full daylight, not just evening.
- 4Bites within minutes of stepping outside at dusk.
- 5Adults resting under deck boards or in ivy.
- 6Mosquitoes indoors resting on walls or in closets.
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.
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Mosquito activity through the year in Los Angeles
Spring
the first wave arrives early in Los Angeles. Start treatments then.
Summer
with highs near 84°F in Los Angeles, 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)
An inspection in Los Angeles also gives you a realistic idea of how much a treatment can do on your lot. A wetland yard is a different job from a dry cul-de-sac.
- Time
- 30–60 minutes
- Best for
- Every yard; finds where mosquitoes actually breed
Misting Systems and In2Care-Style Stations
misting $2,000–$4,500 installed plus refills; stations $200–$500 per season
For a Los Angeles yard that hosts a lot of outdoor living, a fixed misting system releases insecticide from nozzles on a timer. It is the highest-cost option and needs regular refills.
- Time
- Misting: half a day. Stations: under an hour.
- Best for
- Specific yards: heavy outdoor use or spray-averse owners
Source Reduction and Larviciding
$75–$150 per visit
Storm drains, catch basins, and ornamental ponds around Los Angeles get slow-release larvicide briquets that keep working for about a month. Rain barrels and cisterns get screens or dunks.
- 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
Botanical or essential-oil products are an option. They wear off in about a week. Expect more frequent visits and a somewhat lower ceiling on results.
- 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.
Leaf-clogged gutters and downspouts hold water out of sight. Clearing them in fall means fewer places to breed in spring.How mosquito treatment works in Los Angeles.
For Los Angeles homes, 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. First, find and remove the water where they breed. Then spray where the adults rest.
Which mosquitoes bite around Los Angeles.
They breed in small containers. Yellow fever mosquitoes live around Los Angeles 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. Near the coast, salt-marsh mosquitoes can fly into Los Angeles from miles away. Asian tiger mosquitoes are common around Los Angeles. They're black-and-white and bite by day.
Mosquitoes that bite indoors usually slip in through gaps around doors or torn window screens.Mosquito season in Los Angeles.
That's a long season. Plan on regular visits. West Nile cases usually peak in late summer.
A year of mosquitoes in Los Angeles.
- 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 Los Angeles. Start treatments then. - Summer: with highs near 84°F in Los Angeles, 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?
What affects the price
- Lot size and total acreage treated.
- Gutter cleaning or drainage fixes bundled in.
- In2Care-style station count and servicing.
- Travel distance from the company's base.
- Ponds, creeks, or wetland edges on the property.
- One-time visit versus a seasonal plan.
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What's your biggest concern about mosquitoes?
When to call for help
Ponds, drains and dense shrubs are hard to handle yourself. early in the season, before the first big wave. Dumping water should come first. Call if bites still keep you indoors.
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 Los Angeles
For Los Angeles homes, 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. For Los Angeles homes, 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 Los Angeles and California can point out the specific conditions that matter most here before you commit to a plan. For Los Angeles homes, 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. For Los Angeles homes, 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. Los Angeles only gets about 15 inches of rain a year, so local mosquitoes breed where people add water: sprinklers, pools, fountains and AC drips. Summer highs around 84°F in Los Angeles speed up the life cycle, and average humidity near 71% keeps adults active. In denser parts of Los Angeles, storm drains, catch basins and gutters are big breeding spots. Los Angeles 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 Los Angeles, 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 Los Angeles, 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 Los Angeles
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
- Cover or drill drainage holes in tires.
- Clean gutters each spring and fall.
- Add fish or a pump to ornamental ponds.
- Dump and scrub birdbaths every week.
- Screen or lid every rain barrel.
- Repair torn window and door screens.
Renting? Shared courtyards, drains and landscaping are usually the property manager's to handle, so let them know.Did you know?
Mosquito means little fly in Spanish
Larvae are called wrigglers; pupae are tumblers
Questions people ask
Can mosquito control help with West Nile risk?
It can lower it by cutting the number of biting mosquitoes. Repellent and dumping standing water still matter most.
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.
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.
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.
What if the mosquitoes are coming from my neighbor's property?
Treat your own yard and talk to your neighbor. Your local mosquito control district or health department can also help. That's common.
When is mosquito season in Los Angeles?
It runs from about March into November. Daytime biters are tiger mosquitoes; evening biters are usually house mosquitoes.
Do mosquitoes in Los Angeles 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 (17)
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