Mosquito season in Athens County, OH: when it starts and ends

Mosquito months in Athens County

In a normal year mosquito season in Athens County, OH starts around April 11 and ends around October 26, about 28 weeks.

1. Jan
2. Feb
3. Mar
4. Apr
5. May
6. Jun
7. Jul
8. Aug
9. Sep
10. Oct
11. Nov
12. Dec

What to do in Athens County, and when

• Start tipping out standing water weekly by March 28.
• 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 2016): you should use repellent at dusk July to August, more so if over 60.

Athens County against the rest of OH

Athens County has the 20th longest season of 88 OH counties, at 198 days against 209 in Gallia County and 177 in Ashtabula County. Its mean temperature is 52.2°F.

• Jackson County: April 9 to October 24 (198 days, 0 WNV)
• Union County: April 10 to October 26 (198 days, 0 WNV)
• Darke County: April 11 to October 25 (198 days, 1 WNV)
• Highland County: April 12 to October 27 (198 days, 1 WNV)

West Nile in Athens County

From 1999 to 2025, CDC ArboNET counted 2 human West Nile cases in Athens County (2 neuroinvasive) across 2 years. The worst was 2016 with 1; the latest was 2016.

See how the dates are worked out, and when mosquitoes go away for the winter.