Mosquito season in Macon County, IL: when it starts and ends
Mosquito months in Macon County
In a normal year mosquito season in Macon 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 Macon 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.
- 4 West Nile cases since 2016 (last 2024): you should use repellent at dusk June to August, more so if over 60.
Macon County against the rest of IL
Macon County has the 45th 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.
- Calhoun County: April 6 to October 29 (206 days, 0 WNV)
- Hardin County: April 6 to October 29 (206 days, 0 WNV)
- Moultrie County: April 6 to October 28 (205 days, 0 WNV)
- Adams County: April 6 to October 27 (204 days, 4 WNV)
West Nile in Macon County
From 1999 to 2025, CDC ArboNET counted 17 human West Nile cases in Macon County (10 neuroinvasive) across 8 years. The worst was 2002 with 9; the latest was 2024.
More: how the dates are worked out · reading the West Nile counts.