Mosquito season in Indiana County, PA: when it starts and ends
Mosquito months in Indiana County
In a normal year mosquito season in Indiana County, PA starts around April 27 and ends around October 19, about 25 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Indiana County, and when
- Start tipping out standing water weekly by April 13.
- Book any yard treatment for late April, ahead of the July peak.
- Repellent can go away after October 19.
- 1 West Nile case since 2016 (last 2016): you should use repellent at dusk July to July, more so if over 60.
Indiana County against the rest of PA
Indiana County has the 45th longest season of 67 PA counties, at 175 days against 222 in Philadelphia County and 154 in Clinton County. Its mean temperature is 49.2°F.
- Bradford County: April 24 to October 17 (176 days, 0 WNV)
- Clearfield County: April 23 to October 15 (175 days, 0 WNV)
- Butler County: April 26 to October 17 (174 days, 1 WNV)
- Monroe County: April 24 to October 14 (173 days, 3 WNV)
West Nile in Indiana County
From 1999 to 2025, CDC ArboNET counted 1 human West Nile case in Indiana County (0 neuroinvasive) across 1 year. The worst was 2016 with 1; the latest was 2016.
Background: when the season starts across the US; how the dates are worked out.