Mosquito season in Medina County, OH: when it starts and ends
Mosquito months in Medina County
In a normal year mosquito season in Medina County, OH starts around April 21 and ends around October 19, about 26 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Medina County, and when
- Start tipping out standing water weekly by April 7.
- Book any yard treatment for late April, ahead of the July peak.
- Repellent can go away after October 19.
- 4 West Nile cases since 2016 (last 2025): you should use repellent at dusk July to July, more so if over 60.
Medina County against the rest of OH
Medina County has the 83rd longest season of 88 OH counties, at 181 days against 209 in Gallia County and 177 in Ashtabula County. Its mean temperature is 48.9°F.
- Williams County: April 21 to October 20 (182 days, 1 WNV)
- Fulton County: April 21 to October 19 (181 days, 3 WNV)
- Trumbull County: April 22 to October 19 (180 days, 6 WNV)
- Knox County: April 21 to October 17 (179 days, 0 WNV)
West Nile in Medina County
From 1999 to 2025, CDC ArboNET counted 7 human West Nile cases in Medina County (6 neuroinvasive) across 5 years. The worst was 2002 with 3; the latest was 2025.
See how the dates are worked out, and reading the West Nile counts.