Mosquito season in Lawrence County, PA: when it starts and ends
Mosquito months in Lawrence County
In a normal year mosquito season in Lawrence County, PA starts around April 20 and ends around October 25, about 27 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Lawrence County, and when
- Start tipping out standing water weekly by April 6.
- Book any yard treatment for mid April, ahead of the July peak.
- Repellent can go away after October 25.
- 2 West Nile cases since 2016 (last 2025): you should use repellent at dusk July to August, more so if over 60.
Lawrence County against the rest of PA
Lawrence County has the 27th longest season of 67 PA counties, at 188 days against 222 in Philadelphia County and 154 in Clinton County. Its mean temperature is 50.9°F.
- Blair County: April 17 to October 21 (188 days, 1 WNV)
- Dauphin County: April 18 to October 23 (188 days, 8 WNV)
- Erie County: April 22 to October 27 (188 days, 1 WNV)
- Bedford County: April 16 to October 20 (187 days, 1 WNV)
West Nile in Lawrence County
From 1999 to 2025, CDC ArboNET counted 7 human West Nile cases in Lawrence County (4 neuroinvasive) across 5 years. The worst was 2003 with 3; the latest was 2025.
More: how the dates are worked out · when mosquitoes go away for the winter.