Mosquito season in Christian County, IL: when it starts and ends
Mosquito months in Christian County
In a normal year mosquito season in Christian County, IL starts around April 5 and ends around October 29, about 30 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Christian County, and when
- Start tipping out standing water weekly by March 22.
- Book any yard treatment for early April, ahead of the July peak.
- Repellent can go away after October 29.
- No West Nile cases since 2016, so bites in Christian County are a nuisance; check window screens.
Christian County against the rest of IL
Christian County has the 40th longest season of 102 IL counties, at 207 days against 232 in Pulaski County and 174 in Boone County. Its mean temperature is 53.5°F.
- Clark County: April 5 to October 30 (208 days, 0 WNV)
- Macoupin County: April 4 to October 29 (207 days, 3 WNV)
- Shelby County: April 5 to October 29 (207 days, 0 WNV)
- Jersey County: April 5 to October 28 (206 days, 1 WNV)
West Nile in Christian County
From 1999 to 2025, CDC ArboNET counted 2 human West Nile cases in Christian County (2 neuroinvasive) across 2 years. The worst was 2006 with 1; the latest was 2006.
See how the dates are worked out, and when mosquitoes go away for the winter.