Mosquito season in Swain County, NC: when it starts and ends
Mosquito months in Swain County
In a normal year mosquito season in Swain County, NC starts around April 23 and ends around October 16, about 25 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Swain County, and when
- Start tipping out standing water weekly by April 9.
- Book any yard treatment for late April, ahead of the July peak.
- Repellent can go away after October 16.
- No West Nile cases since 2016, so bites in Swain County are a nuisance; check window screens.
Swain County against the rest of NC
Swain County has the 99th longest season of 100 NC counties, at 176 days against 292 in Carteret County and 176 in Ashe County. Its mean temperature is 48.6°F.
- Avery County: April 16 to October 20 (187 days, 0 WNV)
- Watauga County: April 16 to October 19 (186 days, 0 WNV)
- Ashe County: April 25 to October 18 (176 days, 1 WNV)
West Nile in Swain County
CDC ArboNET lists no human West Nile cases for Swain County from 1999 to 2025, though virus turned up in birds, mosquitoes or horses in 1 of those years.
Background: when the season starts across the US; how the dates are worked out.