Mosquito season in Chenango County, NY: when it starts and ends
Mosquito months in Chenango County
In a normal year mosquito season in Chenango County, NY starts around May 1 and ends around October 11, about 23 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Chenango County, and when
- Start tipping out standing water weekly by April 17.
- Book any yard treatment for early May, ahead of the July peak.
- Repellent can go away after October 11.
- No West Nile cases since 2016, so bites in Chenango County are a nuisance; check window screens.
Chenango County against the rest of NY
Chenango County has the 40th longest season of 62 NY counties, at 163 days against 218 in New York County and 125 in Franklin County. Its mean temperature is 45.9°F.
- Oswego County: May 2 to October 14 (164 days, 2 WNV)
- Warren County: April 30 to October 10 (163 days, 0 WNV)
- Steuben County: May 1 to October 11 (163 days, 1 WNV)
- Clinton County: May 1 to October 10 (162 days, 2 WNV)
West Nile in Chenango County
From 1999 to 2025, CDC ArboNET counted 1 human West Nile case in Chenango County (1 neuroinvasive) across 1 year. The worst was 2010 with 1; the latest was 2010.
Background: when mosquitoes go away for the winter; how the dates are worked out.