Mosquito season in Preble County, OH: when it starts and ends
Mosquito months in Preble County
In a normal year mosquito season in Preble County, OH starts around April 13 and ends around October 24, about 28 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Preble 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 24.
- 1 West Nile case since 2016 (last 2018): you should use repellent at dusk June to August, more so if over 60.
Preble County against the rest of OH
Preble County has the 30th longest season of 88 OH counties, at 194 days against 209 in Gallia County and 177 in Ashtabula County. Its mean temperature is 51.2°F.
- Meigs County: April 13 to October 26 (196 days, 1 WNV)
- Monroe County: April 13 to October 25 (195 days, 0 WNV)
- Vinton County: April 13 to October 24 (194 days, 0 WNV)
- Auglaize County: April 14 to October 25 (194 days, 4 WNV)
West Nile in Preble County
From 1999 to 2025, CDC ArboNET counted 6 human West Nile cases in Preble County (5 neuroinvasive) across 4 years. The worst was 2003 with 3; the latest was 2018.
Background: when the season starts across the US; how the dates are worked out.