Mosquito season in Chester County, TN: when it starts and ends
Mosquito months in Chester County
In a normal year mosquito season in Chester County, TN starts around March 30 and ends around November 4, about 31 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Chester 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 4.
- No West Nile cases since 2016, so bites in Chester County are a nuisance; check window screens.
Chester County against the rest of TN
Chester County has the 57th longest season of 95 TN counties, at 219 days against 252 in Hamilton County and 186 in Carter County. Its mean temperature is 58.5°F.
- Knox County: March 31 to November 6 (220 days, 4 WNV)
- Bledsoe County: March 29 to November 3 (219 days, 0 WNV)
- Hickman County: March 31 to November 4 (218 days, 0 WNV)
- Trousdale County: March 31 to November 4 (218 days, 1 WNV)
West Nile in Chester County
From 1999 to 2025, CDC ArboNET counted 1 human West Nile case in Chester County (1 neuroinvasive) across 1 year. The worst was 2012 with 1; the latest was 2012.
More: how the dates are worked out · when mosquitoes go away for the winter.