Mosquito season in Monroe County, IN: when it starts and ends
Mosquito months in Monroe County
In a normal year mosquito season in Monroe County, IN starts around April 5 and ends around October 29, about 29 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 March 22.
- Book any yard treatment for early April, ahead of the July peak.
- Repellent can go away after October 29.
- 1 West Nile case since 2016 (last 2023): you should use repellent at dusk June to August, more so if over 60.
Monroe County against the rest of IN
Monroe County has the 28th longest season of 92 IN counties, at 206 days against 231 in Floyd County and 177 in Steuben County. Its mean temperature is 53.3°F.
- Pike County: April 7 to October 31 (207 days, 0 WNV)
- Jackson County: April 5 to October 28 (206 days, 0 WNV)
- Jennings County: April 8 to October 31 (206 days, 1 WNV)
- Lawrence County: April 7 to October 29 (205 days, 0 WNV)
West Nile in Monroe County
From 1999 to 2025, CDC ArboNET counted 4 human West Nile cases in Monroe County (1 neuroinvasive) across 3 years. The worst was 2012 with 2; the latest was 2023.
Background: when the season starts across the US; how the dates are worked out.