Mosquito season in Monroe County, PA: when it starts and ends
Mosquito months in Monroe County
In a normal year mosquito season in Monroe County, PA starts around April 24 and ends around October 14, about 25 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Monroe County, and when
- Start tipping out standing water weekly by April 10.
- Book any yard treatment for late April, ahead of the July peak.
- Repellent can go away after October 14.
- 3 West Nile cases since 2016 (last 2020): you should use repellent at dusk July to July, more so if over 60.
Monroe County against the rest of PA
Monroe County has the 47th longest season of 67 PA counties, at 173 days against 222 in Philadelphia County and 154 in Clinton County. Its mean temperature is 47.9°F.
- Indiana County: April 27 to October 19 (175 days, 1 WNV)
- Butler County: April 26 to October 17 (174 days, 1 WNV)
- Jefferson County: April 25 to October 14 (173 days, 0 WNV)
- Carbon County: April 25 to October 14 (172 days, 1 WNV)
West Nile in Monroe County
From 1999 to 2025, CDC ArboNET counted 7 human West Nile cases in Monroe County (3 neuroinvasive) across 5 years. The worst was 2018 with 2; the latest was 2020.
More: how the dates are worked out · when the season starts across the US.