Mosquito season in Wabash County, IL: when it starts and ends
Mosquito months in Wabash County
In a normal year mosquito season in Wabash County, IL starts around March 28 and ends around November 4, about 32 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Wabash County, and when
- Start tipping out standing water weekly by March 14.
- 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 2025): you should use repellent at dusk June to August, more so if over 60.
Wabash County against the rest of IL
Wabash County has the 11th longest season of 102 IL counties, at 221 days against 232 in Pulaski County and 174 in Boone County. Its mean temperature is 56.3°F.
- Wayne County: March 27 to November 5 (223 days, 1 WNV)
- Franklin County: March 27 to November 4 (222 days, 8 WNV)
- Perry County: March 28 to November 2 (219 days, 0 WNV)
- Clinton County: March 30 to November 3 (219 days, 2 WNV)
West Nile in Wabash County
From 1999 to 2025, CDC ArboNET counted 5 human West Nile cases in Wabash County (3 neuroinvasive) across 5 years. The worst was 2025 with 1; the latest was 2025.
Background: when the season starts across the US; how the dates are worked out.