Mosquito season in Kankakee County, IL: when it starts and ends
Mosquito months in Kankakee County
In a normal year mosquito season in Kankakee County, IL starts around April 14 and ends around October 25, about 28 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Kankakee County, and when
- Start tipping out standing water weekly by March 31.
- Book any yard treatment for mid April, ahead of the July peak.
- Repellent can go away after October 25.
- 4 West Nile cases since 2016 (last 2019): you should use repellent at dusk June to August, more so if over 60.
Kankakee County against the rest of IL
Kankakee County has the 72nd longest season of 102 IL counties, at 194 days against 232 in Pulaski County and 174 in Boone County. Its mean temperature is 51.2°F.
- Fulton County: April 11 to October 25 (196 days, 1 WNV)
- Piatt County: April 11 to October 23 (195 days, 0 WNV)
- Ford County: April 13 to October 23 (193 days, 1 WNV)
- McDonough County: April 13 to October 23 (193 days, 1 WNV)
West Nile in Kankakee County
From 1999 to 2025, CDC ArboNET counted 14 human West Nile cases in Kankakee County (11 neuroinvasive) across 9 years. The worst was 2012 with 3; the latest was 2019.
More: how the dates are worked out · reading the West Nile counts.