Mosquito season in Adams County, OH: when it starts and ends
Mosquito months in Adams County
In a normal year mosquito season in Adams County, OH starts around April 20 and ends around October 21, about 26 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Adams County, and when
- Start tipping out standing water weekly by April 6.
- Book any yard treatment for mid April, ahead of the July peak.
- Repellent can go away after October 21.
- No West Nile cases since 2016, so bites in Adams County are a nuisance; check window screens.
Adams County against the rest of OH
Adams County has the 76th longest season of 88 OH counties, at 184 days against 209 in Gallia County and 177 in Ashtabula County. Its mean temperature is 53.2°F.
- Carroll County: April 20 to October 22 (185 days, 0 WNV)
- Columbiana County: April 20 to October 22 (185 days, 3 WNV)
- Brown County: April 20 to October 21 (184 days, 0 WNV)
- Summit County: April 20 to October 21 (184 days, 7 WNV)
West Nile in Adams County
From 1999 to 2025, CDC ArboNET counted 2 human West Nile cases in Adams County (2 neuroinvasive) across 2 years. The worst was 2004 with 1; the latest was 2004.
See how the dates are worked out, and when the season starts across the US.