Mosquito season in Morrow County, OH: when it starts and ends
Mosquito months in Morrow County
In a normal year mosquito season in Morrow County, OH starts around April 18 and ends around October 20, about 26 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Morrow 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 20.
- No West Nile cases since 2016, so bites in Morrow County are a nuisance; check window screens.
Morrow County against the rest of OH
Morrow County has the 72nd longest season of 88 OH counties, at 185 days against 209 in Gallia County and 177 in Ashtabula County. Its mean temperature is 49.6°F.
- Tuscarawas County: April 21 to October 24 (186 days, 1 WNV)
- Ashland County: April 18 to October 21 (185 days, 0 WNV)
- Wayne County: April 18 to October 20 (185 days, 4 WNV)
- Carroll County: April 20 to October 22 (185 days, 0 WNV)
West Nile in Morrow County
CDC ArboNET lists no human West Nile cases for Morrow County from 1999 to 2025, though virus turned up in birds, mosquitoes or horses in 5 of those years.
See how the dates are worked out, and when the season starts across the US.