Mosquito season in Carroll County, TN: when it starts and ends
Mosquito months in Carroll County
In a normal year mosquito season in Carroll County, TN starts around March 21 and ends around November 9, about 33 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Carroll County, and when
- Start tipping out standing water weekly by March 7.
- Book any yard treatment for late March, ahead of the July peak.
- Repellent can go away after November 9.
- 1 West Nile case since 2016 (last 2025): you should use repellent at dusk June to September, more so if over 60.
Carroll County against the rest of TN
Carroll County has the 18th longest season of 95 TN counties, at 233 days against 252 in Hamilton County and 186 in Carter County. Its mean temperature is 59.1°F.
- Davidson County: March 20 to November 9 (234 days, 11 WNV)
- Decatur County: March 20 to November 8 (233 days, 0 WNV)
- Hardeman County: March 21 to November 9 (233 days, 0 WNV)
- Williamson County: March 22 to November 10 (233 days, 1 WNV)
West Nile in Carroll County
From 1999 to 2025, CDC ArboNET counted 1 human West Nile case in Carroll County (1 neuroinvasive) across 1 year. The worst was 2025 with 1; the latest was 2025.
Background: when the season starts across the US; how the dates are worked out.