Mosquito season in Johnson County, KY: when it starts and ends
Mosquito months in Johnson County
In a normal year mosquito season in Johnson County, KY starts around April 5 and ends around October 31, about 30 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Johnson County, and when
- Start tipping out standing water weekly by March 22.
- 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 Johnson County are a nuisance; check window screens.
Johnson County against the rest of KY
Johnson County has the 82nd longest season of 120 KY counties, at 209 days against 249 in Lyon County and 180 in Shelby County. Its mean temperature is 54.8°F.
- Bourbon County: April 5 to October 31 (209 days, 0 WNV)
- Greenup County: April 5 to October 31 (209 days, 1 WNV)
- Kenton County: April 5 to October 31 (209 days, 8 WNV)
- Knox County: April 6 to November 1 (209 days, 0 WNV)
West Nile in Johnson County
CDC ArboNET lists no human West Nile cases for Johnson County from 1999 to 2025, though virus turned up in birds, mosquitoes or horses in 3 of those years.
More: how the dates are worked out · when the season starts across the US.