Mosquito season in Rockland County, NY: when it starts and ends
Mosquito months in Rockland County
In a normal year mosquito season in Rockland County, NY starts around April 20 and ends around October 23, about 27 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Rockland County, and when
- Start tipping out standing water weekly by April 6.
- Book any yard treatment for mid April, ahead of the July peak.
- Repellent can go away after October 23.
- 6 West Nile cases since 2016 (last 2025): you should use repellent at dusk July to August, more so if over 60.
Rockland County against the rest of NY
Rockland County has the 9th longest season of 62 NY counties, at 186 days against 218 in New York County and 125 in Franklin County. Its mean temperature is 50.3°F.
- Suffolk County: April 18 to November 1 (197 days, 79 WNV)
- Westchester County: April 19 to October 24 (188 days, 42 WNV)
- Putnam County: April 19 to October 21 (184 days, 0 WNV)
- Orange County: April 20 to October 20 (183 days, 0 WNV)
West Nile in Rockland County
From 1999 to 2025, CDC ArboNET counted 9 human West Nile cases in Rockland County (7 neuroinvasive) across 8 years. The worst was 2023 with 2; the latest was 2025.
Background: reading the West Nile counts; how the dates are worked out.