Mosquito season in Grant County, WV: when it starts and ends
Mosquito months in Grant County
In a normal year mosquito season in Grant County, WV starts around April 13 and ends around October 23, about 28 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Grant County, and when
- Start tipping out standing water weekly by March 30.
- Book any yard treatment for mid April, ahead of the July peak.
- Repellent can go away after October 23.
- No West Nile cases since 2016, so bites in Grant County are a nuisance; check window screens.
Grant County against the rest of WV
Grant County has the 31st longest season of 55 WV counties, at 194 days against 224 in Cabell County and 162 in Randolph County. Its mean temperature is 51.5°F.
- Lewis County: April 15 to October 28 (196 days, 0 WNV)
- Doddridge County: April 15 to October 27 (195 days, 0 WNV)
- Upshur County: April 14 to October 25 (194 days, 0 WNV)
- Calhoun County: April 15 to October 26 (194 days, 0 WNV)
West Nile in Grant County
CDC ArboNET lists no human West Nile cases for Grant County from 1999 to 2025, though virus turned up in birds, mosquitoes or horses in 3 of those years.
Background: when the season starts across the US; how the dates are worked out.