Mosquito season in Monongalia County, WV: when it starts and ends
Mosquito months in Monongalia County
In a normal year mosquito season in Monongalia County, WV starts around April 10 and ends around October 30, about 29 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Monongalia County, and when
- Start tipping out standing water weekly by March 27.
- Book any yard treatment for early April, ahead of the July peak.
- Repellent can go away after October 30.
- 1 West Nile case since 2016 (last 2023): you should use repellent at dusk June to August, more so if over 60.
Monongalia County against the rest of WV
Monongalia County has the 17th longest season of 55 WV counties, at 203 days against 224 in Cabell County and 162 in Randolph County. Its mean temperature is 53.4°F.
- Lincoln County: April 9 to October 30 (204 days, 0 WNV)
- Jackson County: April 10 to October 31 (204 days, 0 WNV)
- Marion County: April 8 to October 26 (202 days, 0 WNV)
- Fayette County: April 8 to October 26 (201 days, 0 WNV)
West Nile in Monongalia County
From 1999 to 2025, CDC ArboNET counted 2 human West Nile cases in Monongalia County (2 neuroinvasive) across 2 years. The worst was 2023 with 1; the latest was 2023.
See how the dates are worked out, and when mosquitoes go away for the winter.