Mosquito season in Morgan County, OH: when it starts and ends
Mosquito months in Morgan County
In a normal year mosquito season in Morgan County, OH starts around April 15 and ends around October 26, about 28 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Morgan County, and when
- Start tipping out standing water weekly by April 1.
- Book any yard treatment for mid April, ahead of the July peak.
- Repellent can go away after October 26.
- No West Nile cases since 2016, so bites in Morgan County are a nuisance; check window screens.
Morgan County against the rest of OH
Morgan County has the 35th longest season of 88 OH counties, at 194 days against 209 in Gallia County and 177 in Ashtabula County. Its mean temperature is 52.3°F.
- Stark County: April 14 to October 25 (194 days, 12 WNV)
- Guernsey County: April 15 to October 26 (194 days, 1 WNV)
- Allen County: April 15 to October 25 (193 days, 1 WNV)
- Mercer County: April 15 to October 25 (193 days, 2 WNV)
West Nile in Morgan County
From 1999 to 2025, CDC ArboNET counted 1 human West Nile case in Morgan County (1 neuroinvasive) across 1 year. The worst was 2003 with 1; the latest was 2003.
Background: when the season starts across the US; how the dates are worked out.