Mosquito season in Edwards County, IL: when it starts and ends
Mosquito months in Edwards County
In a normal year mosquito season in Edwards County, IL starts around March 27 and ends around November 5, about 32 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Edwards County, and when
- Start tipping out standing water weekly by March 13.
- Book any yard treatment for late March, ahead of the July peak.
- Repellent can go away after November 5.
- 1 West Nile case since 2016 (last 2018): you should use repellent at dusk June to September, more so if over 60.
Edwards County against the rest of IL
Edwards County has the 7th longest season of 102 IL counties, at 223 days against 232 in Pulaski County and 174 in Boone County. Its mean temperature is 56.6°F.
- Union County: March 29 to November 8 (224 days, 0 WNV)
- Alexander County: March 26 to November 4 (223 days, 0 WNV)
- Massac County: March 27 to November 5 (223 days, 4 WNV)
- Wayne County: March 27 to November 5 (223 days, 1 WNV)
West Nile in Edwards County
From 1999 to 2025, CDC ArboNET counted 1 human West Nile case in Edwards County (0 neuroinvasive) across 1 year. The worst was 2018 with 1; the latest was 2018.
Background: when the season starts across the US; how the dates are worked out.