Mosquitoes are active in New York City from April through October. During this time, mosquitoes look to lay their eggs in slow-moving or standing water.

Diseases Spread by Mosquitoes

Most mosquitoes you see in the city do not carry disease. Only a few mosquitos species in New York City may carry and spread West Nile virus.

Diseases spread by mosquitoes in areas outside the city include:

Learn more about how New York City monitors the mosquito population.


Daily Tips

Avoid mosquitoes in the city by following these tips:

  • Limit outdoor activity in the evening, especially at dusk and dawn. That’s when the mosquitoes that spread West Nile virus are most active.
  • Use an EPA-approved insect repellent containing DEET, picaridin, IR3535 or oil of lemon eucalyptus.
  • Wear protective clothing outside, especially during the evening. Mosquitoes that carry West Nile virus are most active at night and dawn. During the day, avoid dark-colored clothing.
  • Do not wear colognes, perfumes and scented body lotions.
  • Avoid shaded, bushy areas where mosquitoes rest during the day.

Protect Your Home

Mosquitoes lay their eggs in slow-moving and standing water. To make your home less inviting, be sure to:

  • Remove standing water on your property. Remove water from:
    • Tires
    • Cans
    • Clogged gutters
    • Unused pools and pool covers
  • Change the water in bird baths at least every three or four days.
  • Keep property clean and free of trash, which can collect water.
  • Remind and help neighbors to eliminate mosquito breeding sites on their property.
  • Use window screens and repair or replace those that have tears or holes.

You can report chronic standing water in private or public locations online or by calling 311. You can report water in the street caused by a street defect or a clogged catch basin online or by calling 311.

Pesticide Use

Treat water that can’t be removed with larvicide, a product that kills young mosquitoes. Use larvicides with the active ingredient Bti. You can find products at your local hardware store. Larvicides should be used only as directed by the manufacturer.

Never use foggers or bug bombs inside the home to control insects. You should also avoid using aerosol pesticides.


Before you travel, visit the CDC Traveler’s Health website to find out what mosquito-related diseases are active in your destination.

If you are visiting areas with a high risk of mosquito-borne illness:

  • Place mosquito nets over beds and children’s carriages.
  • Wear insect repellent when spending time outdoors. Be sure to wear repellent during the daylight hours and at night to prevent mosquitoes from biting.
  • Do not leave windows open. When possible, use an air conditioner. If an air conditioner is unavailable, make sure to use window screens.

Your Guide to Safe and Healthy Travel (PDF)
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Additional Resources