Mosquito season in Marion County, WV: when it starts and ends
Mosquito months in Marion County
In a normal year mosquito season in Marion County, WV starts around April 8 and ends around October 26, about 29 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Marion County, and when
- Start tipping out standing water weekly by March 25.
- Book any yard treatment for early April, ahead of the July peak.
- Repellent can go away after October 26.
- No West Nile cases since 2016, so bites in Marion County are a nuisance; check window screens.
Marion County against the rest of WV
Marion County has the 18th longest season of 55 WV counties, at 202 days against 224 in Cabell County and 162 in Randolph County. Its mean temperature is 52.6°F.
- Jackson County: April 10 to October 31 (204 days, 0 WNV)
- Monongalia County: April 10 to October 30 (203 days, 1 WNV)
- Fayette County: April 8 to October 26 (201 days, 0 WNV)
- Harrison County: April 10 to October 28 (201 days, 1 WNV)
West Nile in Marion County
CDC ArboNET lists no human West Nile cases for Marion County from 1999 to 2025, though virus turned up in birds, mosquitoes or horses in 2 of those years.
More: how the dates are worked out · when the season starts across the US.