Mosquito season in Oswego County, NY: when it starts and ends
Mosquito months in Oswego County
In a normal year mosquito season in Oswego County, NY starts around May 2 and ends around October 14, about 23 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Oswego County, and when
- Start tipping out standing water weekly by April 18.
- Book any yard treatment for early May, ahead of the July peak.
- Repellent can go away after October 14.
- 2 West Nile cases since 2016 (last 2017): you should use repellent at dusk July, more so if over 60.
Oswego County against the rest of NY
Oswego County has the 38th longest season of 62 NY counties, at 164 days against 218 in New York County and 125 in Franklin County. Its mean temperature is 45.9°F.
- Schoharie County: April 30 to October 12 (165 days, 0 WNV)
- Tompkins County: May 1 to October 12 (164 days, 1 WNV)
- Warren County: April 30 to October 10 (163 days, 0 WNV)
- Chenango County: May 1 to October 11 (163 days, 0 WNV)
West Nile in Oswego County
From 1999 to 2025, CDC ArboNET counted 5 human West Nile cases in Oswego County (5 neuroinvasive) across 5 years. The worst was 2017 with 1; the latest was 2017.
More: how the dates are worked out · when the season starts across the US.