Mosquito season in Tompkins County, NY: when it starts and ends
Mosquito months in Tompkins County
In a normal year mosquito season in Tompkins County, NY starts around May 1 and ends around October 12, about 23 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Tompkins 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 12.
- 1 West Nile case since 2016 (last 2024): you should use repellent at dusk July, more so if over 60.
Tompkins County against the rest of NY
Tompkins County has the 37th longest season of 62 NY counties, at 164 days against 218 in New York County and 125 in Franklin County. Its mean temperature is 46.2°F.
- Wayne County: April 30 to October 14 (167 days, 1 WNV)
- Schoharie County: April 30 to October 12 (165 days, 0 WNV)
- Oswego County: May 2 to October 14 (164 days, 2 WNV)
- Warren County: April 30 to October 10 (163 days, 0 WNV)
West Nile in Tompkins County
From 1999 to 2025, CDC ArboNET counted 3 human West Nile cases in Tompkins County (3 neuroinvasive) across 3 years. The worst was 2024 with 1; the latest was 2024.
Background: when mosquitoes go away for the winter; how the dates are worked out.