Mosquito season in Lawrence County, OH: when it starts and ends
Mosquito months in Lawrence County
In a normal year mosquito season in Lawrence County, OH starts around April 18 and ends around October 25, about 27 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Lawrence 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 25.
- No West Nile cases since 2016, so bites in Lawrence County are a nuisance; check window screens.
Lawrence County against the rest of OH
Lawrence County has the 57th longest season of 88 OH counties, at 190 days against 209 in Gallia County and 177 in Ashtabula County. Its mean temperature is 53.8°F.
- Richland County: April 16 to October 23 (190 days, 2 WNV)
- Seneca County: April 17 to October 24 (190 days, 0 WNV)
- Wood County: April 18 to October 24 (190 days, 1 WNV)
- Jefferson County: April 18 to October 24 (189 days, 1 WNV)
West Nile in Lawrence County
From 1999 to 2025, CDC ArboNET counted 1 human West Nile case in Lawrence County (1 neuroinvasive) across 1 year. The worst was 2002 with 1; the latest was 2002.
Background: when mosquitoes go away for the winter; how the dates are worked out.