Long Island Pest Calendar: What to Watch for Every Season

Your Year-Round Pest Calendar for Long Island and Queens

Pest activity on Long Island follows predictable seasonal patterns — but many homeowners are caught off guard because they're not watching for the right pests at the right times. This month-by-month guide helps homeowners across Nassau County, Suffolk County, and Queens stay one step ahead.

January – February: The Quiet Season (Mostly)

The coldest months bring reduced pest activity outdoors, but indoor pests are still very much a concern. Mice and rats that entered in fall are established and active all winter, reproducing in wall voids, attics, and basements. German cockroaches maintain and grow their populations indoors regardless of outdoor temperatures. Pantry pests continue to develop in stored foods.

Action item: Check attics, basements, and kitchen cabinets for signs of rodent or pantry pest activity. This is also a good time to schedule a structural inspection before spring pest season begins.

March – April: Spring Awakening

March is the start of active pest season across Long Island. Several critical events happen:

Termite swarms begin in March through May — the most visible sign of established termite colonies. Winged reproductive termites emerge near windows and light sources. If you see a swarm inside your home, call immediately.

Carpenter ants become active — scout workers appear in kitchens and bathrooms, often indicating a colony in moist structural wood.

Overwintering stink bugs in wall voids become active and often end up inside living spaces as they attempt to exit.

Mice that overwintered become more active as temperatures rise.

Tick season begins — blacklegged ticks (deer ticks) are active whenever temperatures exceed 35°F. In Nassau and Suffolk County, March and April are prime tick exposure months during spring gardening.

Action item: Schedule a spring perimeter treatment, inspect weatherstripping, and watch for termite swarmers. Check pets for ticks after every outdoor excursion.

May – June: Peak Ant and Bee Season

Ants are at their highest activity in May and June. Pavement ant and carpenter ant colonies are foraging aggressively. This is the number-one pest complaint season across Nassau and Suffolk County.

Yellow jackets and paper wasps begin building new nests. Queens emerging from overwintering are highly vulnerable in spring — nests destroyed now prevent the 4,000-worker colonies of August.

Mosquitoes become active by mid-May in coastal and water-adjacent areas.

Fleas and ticks reach peak activity as temperatures warm.

Action item: This is the best time to treat small wasp nests before they grow large. Start flea/tick prevention for pets. Consider a mosquito barrier program.

July – August: Heat, Humidity, and Cockroach Season

Summer is peak cockroach season — particularly for German cockroaches in Nassau County multi-family buildings and Queens apartment buildings. Heat and humidity drive cockroach reproduction to maximum rates.

Yellow jackets reach peak colony size in August — colonies of 4,000–5,000 workers. Avoid ground disturbance in areas where yellow jackets may be nesting.

Bed bugs spread more actively in summer as travel increases and people move between homes more frequently.

Mosquito and tick pressure remains high throughout summer.

Action item: Be vigilant about food storage. Address any cockroach or ant activity before it compounds in the heat. Be alert for yellow jacket nests if mowing or doing yard work in Suffolk County.

September – October: The Fall Invasion

September through October is the second busiest pest season of the year across Long Island.

Mice begin pressing indoors as temperatures drop below 50°F. October is the single highest-volume month for rodent service calls across Nassau and Suffolk County.

Stink bugs aggregate on south-facing walls and enter through any gap they can find.

Overwintering insects (lady beetles, box elder bugs, cluster flies) seek entry into wall voids and attics.

Spiders reach maturity and are commonly found indoors during their fall mate-seeking dispersal.

Action item: This is the most important time for pest exclusion work. Seal all entry points before mice are established for winter. Schedule a fall perimeter treatment.

November – December: Battening Down

Outdoor pest activity drops significantly. Rodents are now fully established in winter harborage, carpenter ants enter dormancy, and most overwintering insects are settled in wall voids.

Action item: If you haven't scheduled fall exclusion work yet, do it before hard winter sets in. Monitor for signs of rodent activity indoors throughout the winter.

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Quest Pest Control provides year-round pest control services across Nassau County, Suffolk County, and Queens. Whether it's a spring termite swarm, a summer cockroach problem, or a fall mouse invasion, we're ready to respond — same day or next day in most cases. Searching for pest control near me on Long Island? Contact us anytime.