Mosquito season in Monroe County, OH: when it starts and ends
Mosquito months in Monroe County
In a normal year mosquito season in Monroe County, OH starts around April 13 and ends around October 25, about 28 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Monroe County, and when
- Start tipping out standing water weekly by March 30.
- 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 Monroe County are a nuisance; check window screens.
Monroe County against the rest of OH
Monroe County has the 29th longest season of 88 OH counties, at 195 days against 209 in Gallia County and 177 in Ashtabula County. Its mean temperature is 51.6°F.
- Lake County: April 18 to November 1 (197 days, 5 WNV)
- Meigs County: April 13 to October 26 (196 days, 1 WNV)
- Preble County: April 13 to October 24 (194 days, 1 WNV)
- Vinton County: April 13 to October 24 (194 days, 0 WNV)
West Nile in Monroe County
CDC ArboNET lists no human West Nile cases for Monroe County from 1999 to 2025, though virus turned up in birds, mosquitoes or horses in 3 of those years.
More: how the dates are worked out · when the season starts across the US.