Mosquito season in Erie County, OH: when it starts and ends
Mosquito months in Erie County
In a normal year mosquito season in Erie County, OH starts around April 18 and ends around October 27, about 27 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Erie County, and when
- Start tipping out standing water weekly by April 4.
- Book any yard treatment for mid April, ahead of the July peak.
- Repellent can go away after October 27.
- 1 West Nile case since 2016 (last 2018): you should use repellent at dusk June to August, more so if over 60.
Erie County against the rest of OH
Erie County has the 48th longest season of 88 OH counties, at 192 days against 209 in Gallia County and 177 in Ashtabula County. Its mean temperature is 51.3°F.
- Lucas County: April 16 to October 25 (192 days, 11 WNV)
- Van Wert County: April 16 to October 24 (192 days, 1 WNV)
- Madison County: April 14 to October 22 (191 days, 0 WNV)
- Hardin County: April 16 to October 24 (191 days, 2 WNV)
West Nile in Erie County
From 1999 to 2025, CDC ArboNET counted 4 human West Nile cases in Erie County (4 neuroinvasive) across 3 years. The worst was 2002 with 2; the latest was 2018.
See how the dates are worked out, and when mosquitoes go away for the winter.