Mosquito season in Marion County, TN: when it starts and ends
Mosquito months in Marion County
In a normal year mosquito season in Marion County, TN starts around March 29 and ends around November 6, about 32 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Marion County, and when
- Start tipping out standing water weekly by March 15.
- Book any yard treatment for late March, ahead of the July peak.
- Repellent can go away after November 6.
- No West Nile cases since 2016, so bites in Marion County are a nuisance; check window screens.
Marion County against the rest of TN
Marion County has the 51st longest season of 95 TN counties, at 222 days against 252 in Hamilton County and 186 in Carter County. Its mean temperature is 56°F.
- Smith County: March 30 to November 8 (223 days, 0 WNV)
- Hamblen County: March 29 to November 6 (222 days, 1 WNV)
- Rhea County: March 30 to November 7 (222 days, 0 WNV)
- Cheatham County: March 29 to November 5 (221 days, 0 WNV)
West Nile in Marion County
From 1999 to 2025, CDC ArboNET counted 1 human West Nile case in Marion County (0 neuroinvasive) across 1 year. The worst was 2008 with 1; the latest was 2008.
See how the dates are worked out, and when mosquitoes go away for the winter.