When Does Mosquito Season Start on Long Island?
Learn exactly when to expect mosquito activity in Suffolk and Nassau County — and why 2025 season could be worse than usual.
By MosquitoInfo.com Editorial Team · Pestify Pest Control, Port Jefferson Station, NY
When Does Mosquito Season Start on Long Island?
Long Island homeowners often ask us: when exactly should I start worrying about mosquitoes? The honest answer is earlier than most people think.
The Timeline: Month by Month
April (Late Month)
As soil temperatures exceed 50°F, overwintered mosquito eggs begin to hatch. The first species to emerge are typically floodwater mosquitoes (Aedes vexans), which breed rapidly in temporary pools left by spring rains. If April has been unusually wet — which is common on Long Island — you may see your first biting mosquitoes before May.
May
Mosquito activity ramps up significantly. The Asian tiger mosquito (Aedes albopictus), now the dominant residential species in both Suffolk and Nassau counties, becomes active and begins breeding in any container holding water. This is the ideal time to schedule your first barrier treatment — before populations establish.
June–August (Peak Season)
This is war. Multiple species are simultaneously active, breeding cycles are accelerating, and warm humid nights make outdoor evenings difficult without protection. The northern house mosquito (Culex pipiens) peaks in August and is the primary vector of West Nile Virus on Long Island.
September–October
Activity begins declining but remains significant, especially during warm falls. Deer tick activity actually increases in fall, so this period calls for both mosquito and tick vigilance.
November–March
Adult mosquitoes die off as temperatures drop below 50°F. Eggs and larvae overwinter in protected sites, waiting for spring conditions.
Why 2025 Could Be a Challenging Season
Several factors point toward elevated mosquito pressure this season:
- •Above-average spring rainfall across Long Island has created abundant standing water breeding sites
- •Mild winter temperatures meant higher egg survival rates
- •Aedes albopictus range expansion continues — this aggressive daytime biter is now present across virtually every Long Island neighborhood
The Right Time to Treat
The optimal first treatment window is early May, before peak populations establish. Think of it like crabgrass pre-emergent for your lawn — you want to get ahead of the problem, not chase it.
Waiting until you're actively being bitten means populations are already well-established and harder to knock down with a single treatment.
What You Can Do Right Now
1. Walk your property and empty any containers holding water — even bottle caps
2. Clean your gutters — clogged gutters are among the top mosquito breeding sites on Long Island
3. Add Bti dunks to any permanent water features
4. Schedule a barrier treatment before Memorial Day weekend
Ready to Protect Your Long Island Property?
Get a free estimate from Pestify — your local Long Island mosquito and tick specialists.
Frequently Asked Questions
When should I schedule my first mosquito treatment on Long Island?
Early May is ideal — before peak populations establish. The goal is to treat before the season, not after you're already being bitten heavily.
What temperature do mosquitoes become active?
Mosquitoes become active when temperatures consistently exceed 50°F. On Long Island, this typically occurs in late April. The Asian tiger mosquito is active at even lower temperatures than most species.
Does Long Island have a longer mosquito season than other areas?
Yes. Long Island's coastal climate, abundance of wetlands, and high humidity extend the season at both ends compared to inland New York. Activity can start in April and continue through mid-October.
Free Mosquito Estimate
Long Island specialists · No obligation