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

Mosquito months in Morgan County

In a normal year mosquito season in Morgan County, TN starts around April 5 and ends around October 27, about 29 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 Morgan County, and when

• Start tipping out standing water weekly by March 22.
• Book any yard treatment for early April, ahead of the July peak.
• Repellent can go away after October 27.
• No West Nile cases since 2016, so bites in Morgan County are a nuisance; check window screens.

Morgan County against the rest of TN

Morgan County has the 88th longest season of 95 TN counties, at 205 days against 252 in Hamilton County and 186 in Carter County. Its mean temperature is 55.7°F.

• Unicoi County: April 7 to October 31 (207 days, 0 WNV)
• Grundy County: April 7 to October 30 (206 days, 0 WNV)
• Jackson County: April 8 to October 30 (205 days, 0 WNV)
• Van Buren County: April 8 to October 29 (204 days, 0 WNV)

West Nile in Morgan County

From 1999 to 2025, CDC ArboNET counted 1 human West Nile case in Morgan County (1 neuroinvasive) across 1 year. The worst was 2009 with 1; the latest was 2009.

Background: when mosquitoes go away for the winter; how the dates are worked out.