Mosquito season in Moultrie County, IL: when it starts and ends
Mosquito months in Moultrie County
In a normal year mosquito season in Moultrie County, IL starts around April 6 and ends around October 28, about 29 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Moultrie County, and when
- Start tipping out standing water weekly by March 23.
- Book any yard treatment for early April, ahead of the July peak.
- Repellent can go away after October 28.
- No West Nile cases since 2016, so bites in Moultrie County are a nuisance; check window screens.
Moultrie County against the rest of IL
Moultrie County has the 46th longest season of 102 IL counties, at 205 days against 232 in Pulaski County and 174 in Boone County. Its mean temperature is 53°F.
- Hardin County: April 6 to October 29 (206 days, 0 WNV)
- Macon County: April 6 to October 28 (205 days, 4 WNV)
- Adams County: April 6 to October 27 (204 days, 4 WNV)
- Greene County: April 7 to October 28 (204 days, 0 WNV)
West Nile in Moultrie County
From 1999 to 2025, CDC ArboNET counted 5 human West Nile cases in Moultrie County (5 neuroinvasive) across 3 years. The worst was 2006 with 3; the latest was 2013.
Background: when mosquitoes go away for the winter; how the dates are worked out.