Mosquito season in Wayne County, IA: when it starts and ends
Mosquito months in Wayne County
In a normal year mosquito season in Wayne County, IA starts around April 16 and ends around October 20, about 27 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Wayne County, and when
- Start tipping out standing water weekly by April 2.
- Book any yard treatment for mid April, ahead of the July peak.
- Repellent can go away after October 20.
- 2 West Nile cases since 2016 (last 2023): you should use repellent at dusk June to August, more so if over 60.
Wayne County against the rest of IA
Wayne County has the 22nd longest season of 99 IA counties, at 188 days against 198 in Des Moines County and 160 in Worth County. Its mean temperature is 49.8°F.
- Louisa County: April 15 to October 20 (188 days, 0 WNV)
- Pottawattamie County: April 16 to October 21 (188 days, 18 WNV)
- Cedar County: April 16 to October 20 (187 days, 2 WNV)
- Ringgold County: April 16 to October 20 (187 days, 0 WNV)
West Nile in Wayne County
From 1999 to 2025, CDC ArboNET counted 2 human West Nile cases in Wayne County (0 neuroinvasive) across 2 years. The worst was 2023 with 1; the latest was 2023.
More: how the dates are worked out · when mosquitoes go away for the winter.