Mosquito season in Smith County, TN: when it starts and ends
Mosquito months in Smith County
In a normal year mosquito season in Smith County, TN starts around March 30 and ends around November 8, about 32 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Smith County, and when
- Start tipping out standing water weekly by March 16.
- Book any yard treatment for late March, ahead of the July peak.
- Repellent can go away after November 8.
- No West Nile cases since 2016, so bites in Smith County are a nuisance; check window screens.
Smith County against the rest of TN
Smith County has the 49th longest season of 95 TN counties, at 223 days against 252 in Hamilton County and 186 in Carter County. Its mean temperature is 58.5°F.
- Rutherford County: March 28 to November 7 (224 days, 3 WNV)
- Robertson County: March 28 to November 6 (223 days, 0 WNV)
- Hamblen County: March 29 to November 6 (222 days, 1 WNV)
- Marion County: March 29 to November 6 (222 days, 0 WNV)
West Nile in Smith County
CDC ArboNET lists no human West Nile cases for Smith County from 1999 to 2025, though virus turned up in birds, mosquitoes or horses in 3 of those years.
Background: when the season starts across the US; how the dates are worked out.