Mosquito season in Pope County, IL: when it starts and ends
Mosquito months in Pope County
In a normal year mosquito season in Pope County, IL starts around April 2 and ends around October 31, about 30 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Pope 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 October 31.
- No West Nile cases since 2016, so bites in Pope County are a nuisance; check window screens.
Pope County against the rest of IL
Pope County has the 28th longest season of 102 IL counties, at 212 days against 232 in Pulaski County and 174 in Boone County. Its mean temperature is 56.4°F.
- Jefferson County: April 2 to October 31 (212 days, 1 WNV)
- Johnson County: April 2 to October 31 (212 days, 0 WNV)
- Coles County: April 3 to October 31 (211 days, 4 WNV)
- Cumberland County: April 3 to October 31 (211 days, 0 WNV)
West Nile in Pope County
CDC ArboNET lists no human West Nile cases for Pope County from 1999 to 2025, though virus turned up in birds, mosquitoes or horses in 4 of those years.
Background: when the season starts across the US; how the dates are worked out.