Mosquito season in Polk County, TN: when it starts and ends
Mosquito months in Polk County
In a normal year mosquito season in Polk County, TN starts around March 26 and ends around November 8, about 32 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Polk County, and when
- Start tipping out standing water weekly by March 12.
- 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 Polk County are a nuisance; check window screens.
Polk County against the rest of TN
Polk County has the 37th longest season of 95 TN counties, at 227 days against 252 in Hamilton County and 186 in Carter County. Its mean temperature is 59.2°F.
- Bradley County: March 26 to November 8 (227 days, 0 WNV)
- Meigs County: March 26 to November 8 (227 days, 1 WNV)
- Wilson County: March 26 to November 8 (227 days, 1 WNV)
- Gibson County: March 25 to November 6 (226 days, 1 WNV)
West Nile in Polk County
CDC ArboNET lists no human West Nile cases for Polk County from 1999 to 2025, though virus turned up in birds, mosquitoes or horses in 3 of those years.
Background: when mosquitoes go away for the winter; how the dates are worked out.