Mosquito season in Schuyler County, IL: when it starts and ends
Mosquito months in Schuyler County
In a normal year mosquito season in Schuyler County, IL starts around April 10 and ends around October 25, about 28 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Schuyler County, and when
- Start tipping out standing water weekly by March 27.
- Book any yard treatment for early April, ahead of the July peak.
- Repellent can go away after October 25.
- No West Nile cases since 2016, so bites in Schuyler County are a nuisance; check window screens.
Schuyler County against the rest of IL
Schuyler County has the 66th longest season of 102 IL counties, at 198 days against 232 in Pulaski County and 174 in Boone County. Its mean temperature is 51.7°F.
- De Witt County: April 9 to October 24 (198 days, 0 WNV)
- Henderson County: April 10 to October 25 (198 days, 0 WNV)
- Edgar County: April 11 to October 25 (197 days, 2 WNV)
- Livingston County: April 11 to October 25 (197 days, 0 WNV)
West Nile in Schuyler County
From 1999 to 2025, CDC ArboNET counted 1 human West Nile case in Schuyler County (1 neuroinvasive) across 1 year. The worst was 2005 with 1; the latest was 2005.
Background: when mosquitoes go away for the winter; how the dates are worked out.