Mosquito season in Holmes County, OH: when it starts and ends
Mosquito months in Holmes County
In a normal year mosquito season in Holmes County, OH starts around April 21 and ends around October 21, about 26 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Holmes 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 21.
- 3 West Nile cases since 2016 (last 2019): you should use repellent at dusk July to August, more so if over 60.
Holmes County against the rest of OH
Holmes County has the 80th longest season of 88 OH counties, at 183 days against 209 in Gallia County and 177 in Ashtabula County. Its mean temperature is 50.2°F.
- Summit County: April 20 to October 21 (184 days, 7 WNV)
- Mahoning County: April 20 to October 20 (183 days, 3 WNV)
- Williams County: April 21 to October 20 (182 days, 1 WNV)
- Fulton County: April 21 to October 19 (181 days, 3 WNV)
West Nile in Holmes County
From 1999 to 2025, CDC ArboNET counted 10 human West Nile cases in Holmes County (8 neuroinvasive) across 5 years. The worst was 2003 with 3; the latest was 2019.
More: how the dates are worked out · when the season starts across the US.