Mosquito season in Livingston County, IL: when it starts and ends
Mosquito months in Livingston County
In a normal year mosquito season in Livingston County, IL starts around April 11 and ends around October 25, about 28 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Livingston County, and when
- Start tipping out standing water weekly by March 28.
- Book any yard treatment for mid April, ahead of the July peak.
- Repellent can go away after October 25.
- No West Nile cases since 2016, so bites in Livingston County are a nuisance; check window screens.
Livingston County against the rest of IL
Livingston County has the 68th longest season of 102 IL counties, at 197 days against 232 in Pulaski County and 174 in Boone County. Its mean temperature is 51.5°F.
- Schuyler County: April 10 to October 25 (198 days, 0 WNV)
- Edgar County: April 11 to October 25 (197 days, 2 WNV)
- Putnam County: April 11 to October 25 (197 days, 0 WNV)
- Fulton County: April 11 to October 25 (196 days, 1 WNV)
West Nile in Livingston County
From 1999 to 2025, CDC ArboNET counted 3 human West Nile cases in Livingston County (1 neuroinvasive) across 2 years. The worst was 2015 with 2; the latest was 2015.
More: how the dates are worked out · when mosquitoes go away for the winter.