Mosquito season in Washington County, NY: when it starts and ends
Mosquito months in Washington County
In a normal year mosquito season in Washington County, NY starts around May 5 and ends around October 7, about 22 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Washington County, and when
- Start tipping out standing water weekly by April 21.
- Book any yard treatment for early May, ahead of the July peak.
- Repellent can go away after October 7.
- 1 West Nile case since 2016 (last 2018): you should use repellent at dusk July to July, more so if over 60.
Washington County against the rest of NY
Washington County has the 54th longest season of 62 NY counties, at 155 days against 218 in New York County and 125 in Franklin County. Its mean temperature is 45.7°F.
- Wyoming County: May 5 to October 9 (157 days, 2 WNV)
- Lewis County: May 4 to October 7 (156 days, 0 WNV)
- Otsego County: May 6 to October 6 (154 days, 0 WNV)
- Allegany County: May 8 to October 9 (154 days, 0 WNV)
West Nile in Washington County
From 1999 to 2025, CDC ArboNET counted 2 human West Nile cases in Washington County (2 neuroinvasive) across 2 years. The worst was 2018 with 1; the latest was 2018.
Background: when the season starts across the US; how the dates are worked out.