Mosquito season in Warren County, NY: when it starts and ends

Mosquito months in Warren County

In a normal year mosquito season in Warren County, NY starts around April 30 and ends around October 10, about 23 weeks.

1. Jan
2. Feb
3. Mar
4. Apr
5. May
6. Jun
7. Jul
8. Aug
9. Sep
10. Oct
11. Nov
12. Dec

What to do in Warren County, and when

• Start tipping out standing water weekly by April 16.
• Book any yard treatment for late April, ahead of the July peak.
• Repellent can go away after October 10.
• No West Nile cases since 2016, so bites in Warren County are a nuisance; check window screens.

Warren County against the rest of NY

Warren County has the 39th longest season of 62 NY counties, at 163 days against 218 in New York County and 125 in Franklin County. Its mean temperature is 45.5°F.

• Tompkins County: May 1 to October 12 (164 days, 1 WNV)
• Oswego County: May 2 to October 14 (164 days, 2 WNV)
• Chenango County: May 1 to October 11 (163 days, 0 WNV)
• Steuben County: May 1 to October 11 (163 days, 1 WNV)

West Nile in Warren County

From 1999 to 2025, CDC ArboNET counted 2 human West Nile cases in Warren County (0 neuroinvasive) across 2 years. The worst was 2014 with 1; the latest was 2014.

See how the dates are worked out, and when mosquitoes go away for the winter.