Mosquito season in Carter County, TN: when it starts and ends
Mosquito months in Carter County
In a normal year mosquito season in Carter County, TN starts around April 20 and ends around October 23, about 27 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Carter County, and when
- Start tipping out standing water weekly by April 6.
- Book any yard treatment for mid April, ahead of the July peak.
- Repellent can go away after October 23.
- No West Nile cases since 2016, so bites in Carter County are a nuisance; check window screens.
Carter County against the rest of TN
Carter County has the 95th longest season of 95 TN counties, at 186 days against 252 in Hamilton County and 186 in Carter County. Its mean temperature is 51.8°F.
- Grainger County: April 11 to October 27 (199 days, 0 WNV)
- Johnson County: April 12 to October 24 (195 days, 0 WNV)
West Nile in Carter County
From 1999 to 2025, CDC ArboNET counted 5 human West Nile cases in Carter County (4 neuroinvasive) across 4 years. The worst was 2011 with 2; the latest was 2012.
More: how the dates are worked out · when the season starts across the US.