Mosquito season in Perry County, IN: when it starts and ends
Mosquito months in Perry County
In a normal year mosquito season in Perry County, IN starts around March 31 and ends around November 4, about 31 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Perry County, and when
- Start tipping out standing water weekly by March 17.
- Book any yard treatment for late March, ahead of the July peak.
- Repellent can go away after November 4.
- 1 West Nile case since 2016 (last 2023): you should use repellent at dusk June to August, more so if over 60.
Perry County against the rest of IN
Perry County has the 10th longest season of 92 IN counties, at 218 days against 231 in Floyd County and 177 in Steuben County. Its mean temperature is 56.7°F.
- Dubois County: March 31 to November 4 (218 days, 1 WNV)
- Jefferson County: March 31 to November 4 (218 days, 2 WNV)
- Greene County: March 31 to November 3 (217 days, 1 WNV)
- Knox County: April 1 to November 3 (216 days, 0 WNV)
West Nile in Perry County
From 1999 to 2025, CDC ArboNET counted 2 human West Nile cases in Perry County (2 neuroinvasive) across 2 years. The worst was 2023 with 1; the latest was 2023.
More: how the dates are worked out · when the season starts across the US.