Mosquito season in Trumbull County, OH: when it starts and ends
Mosquito months in Trumbull County
In a normal year mosquito season in Trumbull County, OH starts around April 22 and ends around October 19, about 26 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Trumbull County, and when
- Start tipping out standing water weekly by April 8.
- Book any yard treatment for late April, ahead of the July peak.
- Repellent can go away after October 19.
- 6 West Nile cases since 2016 (last 2025): you should use repellent at dusk July to July, more so if over 60.
Trumbull County against the rest of OH
Trumbull County has the 84th longest season of 88 OH counties, at 180 days against 209 in Gallia County and 177 in Ashtabula County. Its mean temperature is 49.2°F.
- Fulton County: April 21 to October 19 (181 days, 3 WNV)
- Medina County: April 21 to October 19 (181 days, 4 WNV)
- Knox County: April 21 to October 17 (179 days, 0 WNV)
- Portage County: April 22 to October 18 (179 days, 3 WNV)
West Nile in Trumbull County
From 1999 to 2025, CDC ArboNET counted 16 human West Nile cases in Trumbull County (13 neuroinvasive) across 9 years. The worst was 2018 with 4; the latest was 2025.
More: how the dates are worked out · reading the West Nile counts.