Mosquito season in Simpson County, KY: when it starts and ends
Mosquito months in Simpson County
In a normal year mosquito season in Simpson County, KY starts around March 26 and ends around November 9, about 33 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Simpson County, and when
- Start tipping out standing water weekly by March 12.
- Book any yard treatment for late March, ahead of the July peak.
- Repellent can go away after November 9.
- No West Nile cases since 2016, so bites in Simpson County are a nuisance; check window screens.
Simpson County against the rest of KY
Simpson County has the 18th longest season of 120 KY counties, at 228 days against 249 in Lyon County and 180 in Shelby County. Its mean temperature is 58.1°F.
- McCracken County: March 24 to November 7 (228 days, 9 WNV)
- Metcalfe County: March 25 to November 8 (228 days, 1 WNV)
- Daviess County: March 24 to November 6 (226 days, 6 WNV)
- Todd County: March 25 to November 6 (226 days, 0 WNV)
West Nile in Simpson County
From 1999 to 2025, CDC ArboNET counted 2 human West Nile cases in Simpson County (1 neuroinvasive) across 1 year. The worst was 2002 with 2; the latest was 2002.
See how the dates are worked out, and when the season starts across the US.