Mosquito season in Montour County, PA: when it starts and ends
Mosquito months in Montour County
In a normal year mosquito season in Montour 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 Montour 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.
- 1 West Nile case since 2016 (last 2018): you should use repellent at dusk July to August, more so if over 60.
Montour County against the rest of PA
Montour County has the 30th longest season of 67 PA counties, at 187 days against 222 in Philadelphia County and 154 in Clinton County. Its mean temperature is 50.4°F.
- Erie County: April 22 to October 27 (188 days, 1 WNV)
- Bedford County: April 16 to October 20 (187 days, 1 WNV)
- Northumberland County: April 17 to October 21 (187 days, 4 WNV)
- Schuylkill County: April 17 to October 21 (187 days, 4 WNV)
West Nile in Montour County
From 1999 to 2025, CDC ArboNET counted 1 human West Nile case in Montour County (1 neuroinvasive) across 1 year. The worst was 2018 with 1; the latest was 2018.
Background: when the season starts across the US; how the dates are worked out.