The short version
Around Wilmington, mosquito season runs from about May through September. 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 Wilmington 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. Often the source is a neighbor's yard or a storm drain.
- 1A sump pit or crawl space holding water.
- 2Standing water in low spots a week after rain.
- 3Rain barrels without screens or lids.
- 4Welts on ankles and calves after yardwork.
- 5Bites getting worse after each wet spell.
- 6Dogs testing positive for heartworm.
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 Wilmington
Spring
dump water and clean gutters before May.
Summer
peak season in Wilmington, especially July and August.
Fall
activity fades with cooler nights.
Winter
fix drainage and store containers upside down.
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 Wilmington 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
Source Reduction and Larviciding
$75–$150 per visit
Larvicide hits mosquitoes before they can fly, which is why pros in Wilmington 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
Misting Systems and In2Care-Style Stations
misting $2,000–$4,500 installed plus refills; stations $200–$500 per season
Expect a site walk before any install. Nozzle and station placement depend on the lot. Ask for the refill and service costs up front.
- 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.
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 Wilmington.
Barrier spray covers shady shrubs and leaves. Larvicide handles water you can't drain, like ponds or drains. Around Wilmington, the season runs from about May through September, so a plan usually starts in spring and runs to the end of the season. Then spray where the adults rest. First, find and remove the water where they breed. Treatment has two parts.
Which mosquitoes bite around Wilmington.
They're the main West Nile carriers. They breed in storm drains. House mosquitoes (Culex) bite from dusk into the night. They breed in small containers. They're black-and-white and bite by day. Asian tiger mosquitoes are common around Wilmington.
Mosquitoes that bite indoors usually slip in through gaps around doors or torn window screens.Mosquito season in Wilmington.
Numbers usually peak in July and August. West Nile cases usually peak in late summer.
A year of mosquitoes in Wilmington.
- Winter: fix drainage and store containers upside down. - Fall: activity fades with cooler nights. - Summer: peak season in Wilmington, especially July and August. - Spring: dump water and clean gutters before May.
The weekly water walk.
- Tree holes: fill them with sand. - AC drip lines and downspouts: make sure water drains away. - Pet bowls: refresh daily. - Birdbaths: change the water twice a week. - Tarps and covers: pull them tight so water runs off. - Toys and buckets: store them upside down. - Saucers and pots: empty them or add sand. - Gutters: clear leaves so water drains.
Avoiding bites.
- Timing: tiger mosquitoes bite by day; house mosquitoes at dusk. - Screens: repair holes in window and door screens. - Fans: a patio fan keeps weak-flying mosquitoes away. - Clothing: long sleeves and pants help at dusk. - Repellent: DEET, picaridin, IR3535 or oil of lemon eucalyptus.
Low-cost ways to cut mosquitoes.
- Lights: yellow bug lights attract fewer insects to the porch. - Trimming: thin out dense shrubs and tall grass. - Pumps and fountains: moving water breeds far fewer mosquitoes. - Mosquito fish: they eat larvae in ornamental ponds. - Mosquito dunks: Bti tablets kill larvae in rain barrels and ponds.
Mosquito or look-alike?
- Mosquitoes: slim, long legs, and a needle-like mouth. - No-see-ums: tiny biting gnats near marshes. Screens need a finer mesh. - Non-biting midges: swarm near water at dusk. Harmless, just annoying. - Crane flies: look like giant mosquitoes. They don’t bite.
When a bite needs a doctor.
Spreading swelling or an infected-looking bite needs a check too. See a doctor for high fever, stiff neck or confusion. About one in five get a fever, headache or body aches. Most people infected with West Nile virus never feel sick. Most bites just itch for a few days.
Protecting your pets.
Refresh pet water bowls daily, dump saucers after Wilmington's summer storms, and keep animals inside until a yard treatment dries. Talk to your vet about year-round prevention. Heartworm reaches dogs through mosquito bites, and cats can get it as well; in Wilmington the main exposure runs July through September.
What a treatment visit looks like.
Most plans repeat every three to four weeks. Then they spray shady shrubs, where adults rest. Larvicide goes in water you can't drain. They dump or treat standing water. The tech walks the yard first. A visit usually takes 20 to 45 minutes.
Rain barrels and ponds.
- Pool covers: drain standing water after rain. - Tarps: shake out any that hold rainwater. - Gutters: clear them so water drains away. - Bird baths: change the water every few days. - Ponds: fish and moving water keep larvae down. - Barrels: cover openings with fine mesh.
Questions to ask before you sign.
- When can kids and pets go back outside? - How do you protect bees and flowers? - What happens if bites come back between visits? - Do you treat standing water too? - How often will you come? - What product will you spray?
What affects the price
- Gutter cleaning or drainage fixes bundled in.
- Re-treatment policy between scheduled visits.
- Number of visits the local season needs.
- Special-event timing and rush scheduling.
- In2Care-style station count and servicing.
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What's your biggest concern about mosquitoes?
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
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 Wilmington
With about 44 inches of rain a year in Wilmington, any container left out will hold water within days. Summer highs around 87°F in Wilmington speed up the life cycle, and average humidity near 69% keeps adults active. In denser parts of Wilmington, storm drains, catch basins and gutters are big breeding spots. Wilmington has a humid subtropical climate, and mosquitoes activity here tends to pick up late spring through early fall; year-round in the deep south. Around Wilmington, 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. Around Wilmington, 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 Wilmington and Delaware can point out the specific conditions that matter most here before you commit to a plan. Around Wilmington, 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. Around Wilmington, 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. Around Wilmington, a little preparation usually makes the visit more useful: clear access to the areas where you have seen activity, put away loose items, and note anything you have noticed recently. Around Wilmington, if you have photos or a rough timeline of when the problem started, share them, because those details help the provider confirm what is going on and give you a more accurate scope and price.
Local research
Mosquitoes in Wilmington, DE: what the public record shows
Before you compare quotes, it helps to know which mosquitoes actually live in Delaware, when they are busiest around Wilmington, 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 Wilmington
CDC: West Nile transmission June through October, peaking late August to early September. Illinois found its first positive mosquito batch of 2025 on May 9, so larval control should start in May.
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. 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.
- Wear DEET or picaridin repellent outdoors.
- Dump and scrub birdbaths every week.
- Fix low spots that hold water for days.
- Talk with neighbors about shared breeding sites.
- Store buckets, wheelbarrows, and toys upside down.
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
Only females bite; males sip nectar
Questions people ask
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.
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.
How long does a mosquito treatment last?
A barrier spray usually lasts three to four weeks. Heavy rain can shorten that.
Can I get rid of mosquitoes permanently?
Not completely. They fly in from nearby. Removing water and spraying resting spots cuts them down a lot.
Are misting systems worth it?
For a few homes, yes. They're costly to install and need refills. Most yards do fine with source removal and regular spraying.
What do most homeowners do about yard mosquitoes?
Around Wilmington, mosquito control works by removing standing water, treating the water that cannot be drained, and applying barrier treatments where adults rest. Around Wilmington, because they keep breeding through the season, an ongoing plan usually works best.
When is mosquito season in Wilmington?
It runs from about May through September. Daytime biters are tiger mosquitoes; evening biters are usually house mosquitoes.
Do mosquitoes in Wilmington carry West Nile?
They can. West Nile is found in every lower-48 state, Delaware included. Cases usually peak in late summer. Repellent and dumping standing water are your best protection.
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