Mosquito season in Sequatchie County, TN: when it starts and ends

Mosquito months in Sequatchie County

In a normal year mosquito season in Sequatchie County, TN starts around March 12 and ends around November 15, about 35 weeks.

1. Jan
2. Feb
3. Mar
4. Apr
5. May
6. Jun
7. Jul
8. Aug
9. Sep
10. Oct
11. Nov
12. Dec

What to do in Sequatchie County, and when

• Start tipping out standing water weekly by February 26.
• Book any yard treatment for mid March, ahead of the July peak.
• Repellent can go away after November 15.
• No West Nile cases since 2016, so bites in Sequatchie County are a nuisance; check window screens.

Sequatchie County against the rest of TN

Sequatchie County has the 2nd longest season of 95 TN counties, at 248 days against 252 in Hamilton County and 186 in Carter County. Its mean temperature is 59.1°F.

• Hamilton County: March 11 to November 18 (252 days, 6 WNV)
• Shelby County: March 15 to November 17 (247 days, 47 WNV)
• Haywood County: March 16 to November 17 (246 days, 0 WNV)

West Nile in Sequatchie County

CDC ArboNET lists no human West Nile cases for Sequatchie 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.