Mosquito season in Gallia County, OH: when it starts and ends
Mosquito months in Gallia County
In a normal year mosquito season in Gallia County, OH starts around April 4 and ends around October 30, about 30 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Gallia County, and when
- Start tipping out standing water weekly by March 21.
- Book any yard treatment for early April, ahead of the July peak.
- Repellent can go away after October 30.
- No West Nile cases since 2016, so bites in Gallia County are a nuisance; check window screens.
Gallia County against the rest of OH
Gallia County has the 1st longest season of 88 OH counties, at 209 days against 209 in Gallia County and 177 in Ashtabula County. Its mean temperature is 54.1°F.
- Pickaway County: April 5 to October 31 (209 days, 1 WNV)
- Greene County: April 5 to October 30 (208 days, 1 WNV)
West Nile in Gallia County
CDC ArboNET lists no human West Nile cases for Gallia County from 1999 to 2025, though virus turned up in birds, mosquitoes or horses in 4 of those years.
More: how the dates are worked out · when the season starts across the US.