Mosquito season in Warren County, PA: when it starts and ends
Mosquito months in Warren County
In a normal year mosquito season in Warren County, PA starts around May 8 and ends around October 11, about 22 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Warren County, and when
- Start tipping out standing water weekly by April 24.
- Book any yard treatment for early May, ahead of the July peak.
- Repellent can go away after October 11.
- No West Nile cases since 2016, so bites in Warren County are a nuisance; check window screens.
Warren County against the rest of PA
Warren County has the 66th longest season of 67 PA counties, at 156 days against 222 in Philadelphia County and 154 in Clinton County. Its mean temperature is 45.9°F.
- Potter County: May 3 to October 8 (158 days, 1 WNV)
- Fayette County: May 5 to October 10 (158 days, 3 WNV)
- Clinton County: May 7 to October 8 (154 days, 2 WNV)
West Nile in Warren County
CDC ArboNET lists no human West Nile cases for Warren County from 1999 to 2025, though virus turned up in birds, mosquitoes or horses in 9 of those years.
More: how the dates are worked out · when mosquitoes go away for the winter.