Mosquito season in Guernsey County, OH: when it starts and ends
Mosquito months in Guernsey County
In a normal year mosquito season in Guernsey 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 Guernsey 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.
- 1 West Nile case since 2016 (last 2018): you should use repellent at dusk June to August, more so if over 60.
Guernsey County against the rest of OH
Guernsey County has the 34th longest season of 88 OH counties, at 194 days against 209 in Gallia County and 177 in Ashtabula County. Its mean temperature is 52.6°F.
- Auglaize County: April 14 to October 25 (194 days, 4 WNV)
- Stark County: April 14 to October 25 (194 days, 12 WNV)
- Morgan County: April 15 to October 26 (194 days, 0 WNV)
- Allen County: April 15 to October 25 (193 days, 1 WNV)
West Nile in Guernsey County
From 1999 to 2025, CDC ArboNET counted 2 human West Nile cases in Guernsey County (2 neuroinvasive) across 2 years. The worst was 2018 with 1; the latest was 2018.
Background: when the season starts across the US; how the dates are worked out.