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

Mosquito months in Schenectady County

In a normal year mosquito season in Schenectady County, NY starts around April 26 and ends around October 12, about 24 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 Schenectady County, and when

• Start tipping out standing water weekly by April 12.
• Book any yard treatment for late April, ahead of the July peak.
• Repellent can go away after October 12.
• 3 West Nile cases since 2016 (last 2025): you should use repellent at dusk July to July, more so if over 60.

Schenectady County against the rest of NY

Schenectady County has the 28th longest season of 62 NY counties, at 169 days against 218 in New York County and 125 in Franklin County. Its mean temperature is 46.8°F.

• Seneca County: April 28 to October 16 (171 days, 0 WNV)
• Chemung County: April 27 to October 14 (170 days, 1 WNV)
• Montgomery County: April 27 to October 13 (169 days, 0 WNV)
• Broome County: April 28 to October 14 (169 days, 3 WNV)

West Nile in Schenectady County

From 1999 to 2025, CDC ArboNET counted 6 human West Nile cases in Schenectady County (4 neuroinvasive) across 4 years. The worst was 2002 with 3; the latest was 2025.

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