Mosquito season in Northampton County, PA: when it starts and ends
Mosquito months in Northampton County
In a normal year mosquito season in Northampton County, PA starts around April 13 and ends around October 26, about 28 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Northampton County, and when
- Start tipping out standing water weekly by March 30.
- Book any yard treatment for mid April, ahead of the July peak.
- Repellent can go away after October 26.
- 4 West Nile cases since 2016 (last 2023): you should use repellent at dusk July to August, more so if over 60.
Northampton County against the rest of PA
Northampton County has the 17th longest season of 67 PA counties, at 196 days against 222 in Philadelphia County and 154 in Clinton County. Its mean temperature is 52.1°F.
- Cumberland County: April 13 to October 26 (196 days, 8 WNV)
- Juniata County: April 13 to October 26 (196 days, 0 WNV)
- Lehigh County: April 13 to October 25 (195 days, 13 WNV)
- Huntingdon County: April 14 to October 26 (195 days, 1 WNV)
West Nile in Northampton County
From 1999 to 2025, CDC ArboNET counted 8 human West Nile cases in Northampton County (5 neuroinvasive) across 6 years. The worst was 2003 with 3; the latest was 2023.
Background: reading the West Nile counts; how the dates are worked out.