Mosquito season in Richmond County, NY: when it starts and ends
Mosquito months in Richmond County
In a normal year mosquito season in Richmond County, NY starts around April 7 and ends around November 6, about 31 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Richmond County, and when
- Start tipping out standing water weekly by March 24.
- Book any yard treatment for early April, ahead of the July peak.
- Repellent can go away after November 6.
- 31 West Nile cases since 2016: you should wear EPA-registered repellent at dusk June to August, and check NY spray notices.
Richmond County against the rest of NY
Richmond County has the 5th longest season of 62 NY counties, at 214 days against 218 in New York County and 125 in Franklin County. Its mean temperature is 55.3°F.
- Kings County: April 7 to November 9 (216 days, 65 WNV)
- Nassau County: April 7 to November 8 (215 days, 113 WNV)
- Queens County: April 10 to November 7 (211 days, 82 WNV)
- Suffolk County: April 18 to November 1 (197 days, 79 WNV)
West Nile in Richmond County
From 1999 to 2025, CDC ArboNET counted 95 human West Nile cases in Richmond County (72 neuroinvasive) across 23 years. The worst was 2022 with 10; the latest was 2025.
More: how the dates are worked out · reading the West Nile counts.