Mosquito season in Logan County, OH: when it starts and ends
Mosquito months in Logan County
In a normal year mosquito season in Logan County, OH starts around April 16 and ends around October 23, about 27 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Logan County, and when
- Start tipping out standing water weekly by April 2.
- Book any yard treatment for mid April, ahead of the July peak.
- Repellent can go away after October 23.
- 2 West Nile cases since 2016 (last 2025): you should use repellent at dusk July to August, more so if over 60.
Logan County against the rest of OH
Logan County has the 53rd longest season of 88 OH counties, at 190 days against 209 in Gallia County and 177 in Ashtabula County. Its mean temperature is 50.8°F.
- Shelby County: April 16 to October 24 (191 days, 0 WNV)
- Ottawa County: April 17 to October 26 (191 days, 1 WNV)
- Marion County: April 16 to October 23 (190 days, 3 WNV)
- Richland County: April 16 to October 23 (190 days, 2 WNV)
West Nile in Logan County
From 1999 to 2025, CDC ArboNET counted 4 human West Nile cases in Logan County (3 neuroinvasive) across 4 years. The worst was 2025 with 1; the latest was 2025.
More: how the dates are worked out · when mosquitoes go away for the winter.