Mosquito season in Union County, TN: when it starts and ends
Mosquito months in Union County
In a normal year mosquito season in Union County, TN starts around April 7 and ends around November 3, about 30 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Union County, and when
- Start tipping out standing water weekly by March 24.
- Book any yard treatment for early April, ahead of the July peak.
- Repellent can go away after November 3.
- No West Nile cases since 2016, so bites in Union County are a nuisance; check window screens.
Union County against the rest of TN
Union County has the 82nd longest season of 95 TN counties, at 210 days against 252 in Hamilton County and 186 in Carter County. Its mean temperature is 55.6°F.
- DeKalb County: April 4 to November 1 (211 days, 0 WNV)
- Anderson County: April 7 to November 3 (210 days, 0 WNV)
- Greene County: April 6 to November 1 (209 days, 0 WNV)
- Washington County: April 7 to November 1 (208 days, 3 WNV)
West Nile in Union County
CDC ArboNET lists no human West Nile cases for Union County from 1999 to 2025, though virus turned up in birds, mosquitoes or horses in 3 of those years.
See how the dates are worked out, and when the season starts across the US.