Mosquito season in Perry County, PA: when it starts and ends
Mosquito months in Perry County
In a normal year mosquito season in Perry County, PA starts around April 14 and ends around October 26, about 28 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Perry County, and when
- Start tipping out standing water weekly by March 31.
- Book any yard treatment for mid April, ahead of the July peak.
- Repellent can go away after October 26.
- 1 West Nile case since 2016 (last 2024): you should use repellent at dusk July to August, more so if over 60.
Perry County against the rest of PA
Perry County has the 20th longest season of 67 PA counties, at 195 days against 222 in Philadelphia County and 154 in Clinton County. Its mean temperature is 51.8°F.
- Lehigh County: April 13 to October 25 (195 days, 13 WNV)
- Huntingdon County: April 14 to October 26 (195 days, 1 WNV)
- Snyder County: April 14 to October 23 (193 days, 0 WNV)
- Union County: April 15 to October 23 (191 days, 1 WNV)
West Nile in Perry County
From 1999 to 2025, CDC ArboNET counted 3 human West Nile cases in Perry County (1 neuroinvasive) across 3 years. The worst was 2024 with 1; the latest was 2024.
More: how the dates are worked out · when the season starts across the US.