Mosquito season in Elk County, PA: when it starts and ends
Mosquito months in Elk County
In a normal year mosquito season in Elk 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 Elk 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 Elk County are a nuisance; check window screens.
Elk County against the rest of PA
Elk County has the 59th longest season of 67 PA counties, at 160 days against 222 in Philadelphia County and 154 in Clinton County. Its mean temperature is 45.8°F.
- Mercer County: May 3 to October 13 (163 days, 0 WNV)
- Cambria County: May 4 to October 12 (161 days, 4 WNV)
- McKean County: May 3 to October 10 (160 days, 0 WNV)
- Wayne County: May 3 to October 10 (160 days, 0 WNV)
West Nile in Elk County
From 1999 to 2025, CDC ArboNET counted 4 human West Nile cases in Elk County (1 neuroinvasive) across 1 year. The worst was 2003 with 4; the latest was 2003.
Background: when the season starts across the US; how the dates are worked out.