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

Mosquito months in Tioga County

In a normal year mosquito season in Tioga County, NY starts around May 2 and ends around October 11, 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 Tioga 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 11.
• 1 West Nile case since 2016 (last 2018): you should use repellent at dusk July, more so if over 60.

Tioga County against the rest of NY

Tioga County has the 45th longest season of 62 NY counties, at 162 days against 218 in New York County and 125 in Franklin County. Its mean temperature is 45.9°F.

• Jefferson County: May 2 to October 11 (162 days, 1 WNV)
• Schuyler County: May 2 to October 11 (162 days, 0 WNV)
• Sullivan County: May 2 to October 10 (161 days, 2 WNV)
• St. Lawrence County: May 2 to October 9 (160 days, 3 WNV)

West Nile in Tioga County

From 1999 to 2025, CDC ArboNET counted 1 human West Nile case in Tioga County (1 neuroinvasive) across 1 year. The worst was 2018 with 1; the latest was 2018.

Background: when the season starts across the US; how the dates are worked out.