Mosquito season in Erie County, NY: when it starts and ends
Mosquito months in Erie County
In a normal year mosquito season in Erie County, NY starts around April 30 and ends around October 15, about 24 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Erie 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 15.
- 12 West Nile cases since 2016: you should wear EPA-registered repellent at dusk July, and check NY spray notices.
Erie County against the rest of NY
Erie County has the 32nd 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.
- Broome County: April 28 to October 14 (169 days, 3 WNV)
- Oneida County: April 28 to October 14 (169 days, 1 WNV)
- Albany County: April 27 to October 12 (168 days, 4 WNV)
- Rensselaer County: April 29 to October 12 (167 days, 1 WNV)
West Nile in Erie County
From 1999 to 2025, CDC ArboNET counted 36 human West Nile cases in Erie County (24 neuroinvasive) across 8 years. The worst was 2012 with 12; the latest was 2025.
Background: reading the West Nile counts; how the dates are worked out.