Mosquito season in Marshall County, WV: when it starts and ends
Mosquito months in Marshall County
In a normal year mosquito season in Marshall County, WV starts around April 15 and ends around October 26, about 28 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Marshall County, and when
- Start tipping out standing water weekly by April 1.
- Book any yard treatment for mid April, ahead of the July peak.
- Repellent can go away after October 26.
- No West Nile cases since 2016, so bites in Marshall County are a nuisance; check window screens.
Marshall County against the rest of WV
Marshall County has the 34th longest season of 55 WV counties, at 194 days against 224 in Cabell County and 162 in Randolph County. Its mean temperature is 52.2°F.
- Upshur County: April 14 to October 25 (194 days, 0 WNV)
- Calhoun County: April 15 to October 26 (194 days, 0 WNV)
- Ritchie County: April 15 to October 26 (194 days, 0 WNV)
- Hancock County: April 14 to October 24 (193 days, 0 WNV)
West Nile in Marshall County
CDC ArboNET lists no human West Nile cases for Marshall 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.