Mosquito season in McKean County, PA: when it starts and ends
Mosquito months in McKean County
In a normal year mosquito season in McKean County, PA starts around May 3 and ends around October 10, about 23 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in McKean County, and when
- Start tipping out standing water weekly by April 19.
- Book any yard treatment for early May, ahead of the July peak.
- Repellent can go away after October 10.
- No West Nile cases since 2016, so bites in McKean County are a nuisance; check window screens.
McKean County against the rest of PA
McKean County has the 60th longest season of 67 PA counties, at 160 days against 222 in Philadelphia County and 154 in Clinton County. Its mean temperature is 45.7°F.
- Cambria County: May 4 to October 12 (161 days, 4 WNV)
- Elk County: May 3 to October 10 (160 days, 0 WNV)
- Wayne County: May 3 to October 10 (160 days, 0 WNV)
- Susquehanna County: May 3 to October 9 (159 days, 0 WNV)
West Nile in McKean County
From 1999 to 2025, CDC ArboNET counted 1 human West Nile case in McKean County (1 neuroinvasive) across 1 year. The worst was 2012 with 1; the latest was 2012.
Background: when mosquitoes go away for the winter; how the dates are worked out.