Mosquito season in Crawford County, IL: when it starts and ends
Mosquito months in Crawford County
In a normal year mosquito season in Crawford County, IL starts around April 4 and ends around October 30, about 30 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Crawford County, and when
- Start tipping out standing water weekly by March 21.
- Book any yard treatment for early April, ahead of the July peak.
- Repellent can go away after October 30.
- No West Nile cases since 2016, so bites in Crawford County are a nuisance; check window screens.
Crawford County against the rest of IL
Crawford County has the 35th longest season of 102 IL counties, at 209 days against 232 in Pulaski County and 174 in Boone County. Its mean temperature is 54.1°F.
- Fayette County: April 2 to October 30 (210 days, 0 WNV)
- Richland County: April 3 to October 31 (210 days, 1 WNV)
- White County: April 3 to October 28 (208 days, 0 WNV)
- Pike County: April 4 to October 30 (208 days, 0 WNV)
West Nile in Crawford County
From 1999 to 2025, CDC ArboNET counted 8 human West Nile cases in Crawford County (5 neuroinvasive) across 5 years. The worst was 2002 with 3; the latest was 2014.
More: how the dates are worked out · when the season starts across the US.