Mosquito season in Clarion County, PA: when it starts and ends
Mosquito months in Clarion County
In a normal year mosquito season in Clarion County, PA starts around April 29 and ends around October 14, about 24 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Clarion County, and when
- Start tipping out standing water weekly by April 15.
- Book any yard treatment for late April, ahead of the July peak.
- Repellent can go away after October 14.
- No West Nile cases since 2016, so bites in Clarion County are a nuisance; check window screens.
Clarion County against the rest of PA
Clarion County has the 51st longest season of 67 PA counties, at 168 days against 222 in Philadelphia County and 154 in Clinton County. Its mean temperature is 47.4°F.
- Carbon County: April 25 to October 14 (172 days, 1 WNV)
- Cameron County: April 27 to October 14 (170 days, 0 WNV)
- Pike County: April 29 to October 14 (168 days, 0 WNV)
- Somerset County: April 30 to October 12 (165 days, 2 WNV)
West Nile in Clarion County
CDC ArboNET lists no human West Nile cases for Clarion County from 1999 to 2025, though virus turned up in birds, mosquitoes or horses in 7 of those years.
See how the dates are worked out, and when the season starts across the US.