Mosquito season in Mercer County, WV: when it starts and ends
Mosquito months in Mercer County
In a normal year mosquito season in Mercer County, WV starts around April 16 and ends around October 19, about 27 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Mercer County, and when
- Start tipping out standing water weekly by April 2.
- Book any yard treatment for mid April, ahead of the July peak.
- Repellent can go away after October 19.
- No West Nile cases since 2016, so bites in Mercer County are a nuisance; check window screens.
Mercer County against the rest of WV
Mercer County has the 43rd longest season of 55 WV counties, at 186 days against 224 in Cabell County and 162 in Randolph County. Its mean temperature is 52.1°F.
- Roane County: April 19 to October 26 (190 days, 0 WNV)
- Pendleton County: April 18 to October 23 (188 days, 0 WNV)
- Tyler County: April 20 to October 23 (186 days, 0 WNV)
- Preston County: April 18 to October 20 (184 days, 0 WNV)
West Nile in Mercer County
CDC ArboNET lists no human West Nile cases for Mercer County from 1999 to 2025, though virus turned up in birds, mosquitoes or horses in 5 of those years.
See how the dates are worked out, and when the season starts across the US.