When is mosquito season on Long Island?

Long Island's mosquito season runs from approximately late May through October, with peak activity in July and August. The first generation of mosquitoes emerges after warm spring rains and as temperatures consistently exceed 50°F. Activity peaks in midsummer when temperatures are highest and standing water from summer storms sustains continuous breeding. A second surge often occurs in late August after late-summer rains before cooler September temperatures reduce activity.

Does Long Island have West Nile virus mosquitoes?

Yes. Long Island has documented West Nile virus transmission in most years since the virus arrived in the New York area in 1999. The Culex pipiens mosquito, which breeds in stagnant organic-rich water including storm drains, clogged gutters, and standing containers, is the primary local vector. Nassau and Suffolk county vector control programs conduct annual surveillance and treatment on public lands, but private property mosquito control is the homeowner's responsibility.

What is the most effective way to reduce mosquitoes in my Long Island yard?

The most effective combination is eliminating all standing water breeding sources (cleaning gutters, emptying containers, treating ornamental water features with BTi larvicide) combined with professional barrier spray treatments on vegetation resting surfaces. Source elimination alone significantly reduces breeding, but adult mosquitoes flying in from adjacent properties and wetlands require barrier treatment to intercept. A professional seasonal program combining both approaches provides the greatest reduction.

Are professional mosquito treatments safe for children and pets?

Professional mosquito barrier spray treatments using permethrin are considered safe for people and pets once the treated surfaces have dried, which typically takes 30–60 minutes. Treatments should not be applied while people or pets are present in the treated area, and re-entry should be delayed until surfaces are dry. Pyrethrin-based and naturally derived products are also available. BTi larvicide is not harmful to mammals, birds, or beneficial insects including bees when used as directed.

Does Control Exterminating provide mosquito control on Long Island?

Yes. Control Exterminating provides seasonal mosquito control programs for Long Island residential properties in Nassau and Suffolk counties. Programs include barrier spray treatments applied every 3–4 weeks from May through September, larvicide application to standing water features, and elimination guidance for breeding sources. Call (212) 696-4164 to schedule service or discuss a seasonal program for your property.

What diseases do mosquitoes carry on Long Island?

The primary mosquito-borne disease concern on Long Island is West Nile virus, transmitted by the Culex pipiens species common throughout Nassau and Suffolk counties. Eastern Equine Encephalitis (EEE) has been documented in western Suffolk County near wetland areas, though human cases are rare. Mosquito-transmitted diseases that are concerns in other parts of the US (Zika, dengue, chikungunya) are not currently transmitted by local Long Island mosquitoes but can be brought from endemic regions by travelers.

Mosquito Control for Long Island Homes

Long Island summers mean mosquito season. Discover professional mosquito treatment options that protect your yard and outdoor living spaces throughout the warm months.

Long Island's combination of suburban landscaping, coastal wetlands, golf courses, and wooded residential neighborhoods creates some of the most productive mosquito habitat in the New York metro area. From the South Shore salt marshes to freshwater retention ponds in inland Nassau and Suffolk communities, mosquito populations can be substantial from late May through October. For Long Island homeowners, mosquito control is not just about comfort during backyard gatherings — it is a genuine public health concern, given Long Island's documented history with West Nile virus and the broader concern about mosquito-borne illness transmission.

Mosquito Species on Long Island

Long Island's mosquito population includes more than 60 documented species, but a handful are responsible for most nuisance and disease transmission:

Aedes vexans (inland floodwater mosquito): The most abundant nuisance mosquito in many Long Island communities following rain events. Females breed in temporary floodwater pools in lawns, woodland depressions, and poorly draining landscaping. Aggressive daytime and evening biters.
Culex pipiens (northern house mosquito): The primary vector of West Nile virus in the Northeast. Breeds in standing water with organic content — storm drains, bird baths, clogged gutters, containers, and low-lying areas with stagnant water. Active from dusk through dawn, biting at night.
Ochlerotatus canadensis and O. japonicus: Container breeders and woodland species that appear in suburban landscaping. Aedes japonicus is a recent invasive with documented presence throughout Long Island.

Nassau and Suffolk counties maintain mosquito control programs through the Nassau County Department of Public Works and the Suffolk County Vector Control, which conduct surveillance and apply larvicides and adulticides to public lands. However, private residential properties are the responsibility of homeowners.

West Nile Virus on Long Island

West Nile virus is transmitted by infected Culex pipiens mosquitoes. Long Island has documented human cases of West Nile infection in most years since the virus was first identified in Queens in 1999. Most infected individuals experience mild or no symptoms, but a small percentage develop serious neurological illness. Nassau and Suffolk counties conduct annual mosquito surveillance with sentinel chicken flocks and trap collections to monitor West Nile activity levels throughout the season.

Homeowners can reduce their personal risk by eliminating standing water that supports Culex pipiens breeding, applying EPA-registered repellents when outdoors during peak mosquito hours (dusk through dawn), and maintaining window and door screens in good repair.

Eliminating Breeding Sources on Long Island Properties

The most effective mosquito reduction measure on any Long Island property is eliminating standing water breeding sources:

Clean gutters of leaf debris at least twice per season — clogged gutters are major Culex mosquito production sites
Dump and refill bird baths at least twice per week — mosquito eggs hatch within 7–10 days of water stagnation
Store or overturn any containers that collect rainwater (pots, tarps, buckets, children's toys)
Treat ornamental ponds with BTi (Bacillus thuringiensis israelensis) mosquito dunks — these kill mosquito larvae without harming fish, birds, or beneficial insects
Grade landscaping to prevent water pooling in lawn depressions after rain
Clean and chlorinate swimming pools regularly; cover when not in use for extended periods

Professional Mosquito Treatment for Long Island Yards

For Long Island homeowners with large properties, wooded landscaping, or properties adjacent to wetlands or drainage corridors, professional mosquito treatment programs provide substantially greater reduction in adult mosquito populations than source elimination alone. Professional treatments include:

Barrier spray treatments: Application of a residual insecticide (permethrin-based or natural pyrethrin) to the resting surfaces of vegetation — undersides of leaves, shrub bases, and shaded areas where mosquitoes rest during the day. Treatment typically lasts 2–4 weeks and is applied every 3–4 weeks during the season (May–October).
BTi larvicide treatments: Application of BTi granules or dunks to standing water that cannot be eliminated — retention ponds, ditches, woodland pools. BTi is a naturally occurring bacterium that selectively kills mosquito larvae without impacting other wildlife.
Seasonal programs: Monthly or every-three-week scheduled service from late May through late September covers the full mosquito season on Long Island.

Why Choose Control Exterminating?

Control Exterminating has served New York City since 1973 — over 53 years of experience treating every pest NYC throws at us. Our licensed technicians know how pests move through NYC's dense housing stock, aging infrastructure, and commercial corridors. Whether it's German cockroaches spreading between apartment units, Norway rats exploiting the sewer system, or bed bugs hitchhiking through a mid-rise building, we've seen it all and eliminated it all. Call us at (212) 696-4164 or book online for fast, discreet service across all 5 boroughs, Nassau, Suffolk, and Westchester.