Mosquito season in Schuylkill County, PA: when it starts and ends
Mosquito months in Schuylkill County
In a normal year mosquito season in Schuylkill County, PA starts around April 17 and ends around October 21, about 27 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Schuylkill County, and when
- Start tipping out standing water weekly by April 3.
- Book any yard treatment for mid April, ahead of the July peak.
- Repellent can go away after October 21.
- 4 West Nile cases since 2016 (last 2025): you should use repellent at dusk July to August, more so if over 60.
Schuylkill County against the rest of PA
Schuylkill County has the 32nd longest season of 67 PA counties, at 187 days against 222 in Philadelphia County and 154 in Clinton County. Its mean temperature is 50.3°F.
- Montour County: April 17 to October 21 (187 days, 1 WNV)
- Northumberland County: April 17 to October 21 (187 days, 4 WNV)
- Lackawanna County: April 18 to October 21 (186 days, 4 WNV)
- Lycoming County: April 19 to October 20 (184 days, 1 WNV)
West Nile in Schuylkill County
From 1999 to 2025, CDC ArboNET counted 5 human West Nile cases in Schuylkill County (1 neuroinvasive) across 4 years. The worst was 2018 with 2; the latest was 2025.
See how the dates are worked out, and reading the West Nile counts.