Mosquito season in Geauga County, OH: when it starts and ends
Mosquito months in Geauga County
In a normal year mosquito season in Geauga County, OH starts around April 24 and ends around October 18, about 25 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Geauga County, and when
- Start tipping out standing water weekly by April 10.
- Book any yard treatment for late April, ahead of the July peak.
- Repellent can go away after October 18.
- No West Nile cases since 2016, so bites in Geauga County are a nuisance; check window screens.
Geauga County against the rest of OH
Geauga County has the 87th longest season of 88 OH counties, at 177 days against 209 in Gallia County and 177 in Ashtabula County. Its mean temperature is 48.4°F.
- Knox County: April 21 to October 17 (179 days, 0 WNV)
- Portage County: April 22 to October 18 (179 days, 3 WNV)
- Ashtabula County: April 25 to October 19 (177 days, 3 WNV)
West Nile in Geauga County
From 1999 to 2025, CDC ArboNET counted 5 human West Nile cases in Geauga County (2 neuroinvasive) across 3 years. The worst was 2002 with 3; the latest was 2007.
More: how the dates are worked out · when the season starts across the US.