Mosquito season in Lawrence County, IL: when it starts and ends
Mosquito months in Lawrence County
In a normal year mosquito season in Lawrence County, IL starts around April 2 and ends around November 1, about 31 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Lawrence County, and when
- Start tipping out standing water weekly by March 19.
- Book any yard treatment for early April, ahead of the July peak.
- Repellent can go away after November 1.
- No West Nile cases since 2016, so bites in Lawrence County are a nuisance; check window screens.
Lawrence County against the rest of IL
Lawrence County has the 21st longest season of 102 IL counties, at 214 days against 232 in Pulaski County and 174 in Boone County. Its mean temperature is 54.9°F.
- Bond County: March 31 to November 2 (215 days, 1 WNV)
- Randolph County: April 1 to November 1 (214 days, 1 WNV)
- Montgomery County: April 2 to November 2 (214 days, 0 WNV)
- St. Clair County: March 31 to October 30 (213 days, 18 WNV)
West Nile in Lawrence County
CDC ArboNET lists no human West Nile cases for Lawrence County from 1999 to 2025, though virus turned up in birds, mosquitoes or horses in 5 of those years.
Background: when mosquitoes go away for the winter; how the dates are worked out.