Mosquito season in Howard County, IN: when it starts and ends
Mosquito months in Howard County
In a normal year mosquito season in Howard County, IN starts around April 15 and ends around October 23, about 27 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Howard County, and when
- Start tipping out standing water weekly by April 1.
- Book any yard treatment for mid April, ahead of the July peak.
- Repellent can go away after October 23.
- 5 West Nile cases since 2016 (last 2025): you should use repellent at dusk June to August, more so if over 60.
Howard County against the rest of IN
Howard County has the 64th longest season of 92 IN counties, at 191 days against 231 in Floyd County and 177 in Steuben County. Its mean temperature is 50.6°F.
- Montgomery County: April 14 to October 23 (191 days, 0 WNV)
- Henry County: April 15 to October 23 (191 days, 0 WNV)
- Newton County: April 15 to October 22 (191 days, 0 WNV)
- White County: April 15 to October 23 (191 days, 1 WNV)
West Nile in Howard County
From 1999 to 2025, CDC ArboNET counted 9 human West Nile cases in Howard County (6 neuroinvasive) across 5 years. The worst was 2025 with 4; the latest was 2025.
Background: reading the West Nile counts; how the dates are worked out.