Mosquito season in Madison County, TN: when it starts and ends
Mosquito months in Madison County
In a normal year mosquito season in Madison County, TN starts around March 22 and ends around November 7, about 33 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 8.
- Book any yard treatment for late March, ahead of the July peak.
- Repellent can go away after November 7.
- 1 West Nile case since 2016 (last 2025): you should use repellent at dusk June to September, more so if over 60.
Madison County against the rest of TN
Madison County has the 27th longest season of 95 TN counties, at 230 days against 252 in Hamilton County and 186 in Carter County. Its mean temperature is 59.9°F.
- Cocke County: March 24 to November 10 (231 days, 0 WNV)
- Jefferson County: March 22 to November 7 (230 days, 2 WNV)
- Obion County: March 22 to November 7 (230 days, 1 WNV)
- McNairy County: March 24 to November 9 (230 days, 0 WNV)
West Nile in Madison County
From 1999 to 2025, CDC ArboNET counted 6 human West Nile cases in Madison County (4 neuroinvasive) across 4 years. The worst was 2002 with 3; the latest was 2025.
See how the dates are worked out, and when the season starts across the US.