Mosquito season in Ashtabula County, OH: when it starts and ends
Mosquito months in Ashtabula County
In a normal year mosquito season in Ashtabula County, OH starts around April 25 and ends around October 19, about 25 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Ashtabula County, and when
- Start tipping out standing water weekly by April 11.
- Book any yard treatment for late April, ahead of the July peak.
- Repellent can go away after October 19.
- 3 West Nile cases since 2016 (last 2024): you should use repellent at dusk July, more so if over 60.
Ashtabula County against the rest of OH
Ashtabula County has the 88th 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.
- Portage County: April 22 to October 18 (179 days, 3 WNV)
- Geauga County: April 24 to October 18 (177 days, 0 WNV)
West Nile in Ashtabula County
From 1999 to 2025, CDC ArboNET counted 8 human West Nile cases in Ashtabula County (7 neuroinvasive) across 4 years. The worst was 2002 with 3; the latest was 2024.
More: how the dates are worked out · when mosquitoes go away for the winter.