Mosquito season in New York County, NY: when it starts and ends
Mosquito months in New York County
In a normal year mosquito season in New York County, NY starts around April 4 and ends around November 9, about 31 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in New York County, and when
- Start tipping out standing water weekly by March 21.
- Book any yard treatment for early April, ahead of the July peak.
- Repellent can go away after November 9.
- 38 West Nile cases since 2016: you should wear EPA-registered repellent at dusk June to August, and check NY spray notices.
New York County against the rest of NY
New York County has the 1st longest season of 62 NY counties, at 218 days against 218 in New York County and 125 in Franklin County. Its mean temperature is 55.8°F.
- Bronx County: April 6 to November 9 (216 days, 17 WNV)
- Kings County: April 7 to November 9 (216 days, 65 WNV)
West Nile in New York County
From 1999 to 2025, CDC ArboNET counted 77 human West Nile cases in New York County (63 neuroinvasive) across 23 years. The worst was 2012 with 9; the latest was 2025.
More: how the dates are worked out · reading the West Nile counts.