Mosquito season in Madison County, KY: when it starts and ends
Mosquito months in Madison County
In a normal year mosquito season in Madison County, KY starts around April 3 and ends around November 1, about 30 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Madison County, and when
- Start tipping out standing water weekly by March 20.
- Book any yard treatment for early April, ahead of the July peak.
- Repellent can go away after November 1.
- 1 West Nile case since 2016 (last 2025): you should use repellent at dusk June to August, more so if over 60.
Madison County against the rest of KY
Madison County has the 60th longest season of 120 KY counties, at 212 days against 249 in Lyon County and 180 in Shelby County. Its mean temperature is 55.9°F.
- Larue County: April 4 to November 3 (213 days, 0 WNV)
- Wayne County: April 4 to November 3 (213 days, 1 WNV)
- Marshall County: March 31 to October 28 (211 days, 0 WNV)
- Butler County: April 2 to October 30 (211 days, 0 WNV)
West Nile in Madison County
From 1999 to 2025, CDC ArboNET counted 2 human West Nile cases in Madison County (1 neuroinvasive) across 2 years. The worst was 2025 with 1; the latest was 2025.
More: how the dates are worked out · when the season starts across the US.