Mosquito season in Mitchell County, IA: when it starts and ends
Mosquito months in Mitchell County
In a normal year mosquito season in Mitchell County, IA starts around April 26 and ends around October 11, about 24 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Mitchell County, and when
- Start tipping out standing water weekly by April 12.
- Book any yard treatment for late April, ahead of the July peak.
- Repellent can go away after October 11.
- 1 West Nile case since 2016 (last 2018): you should use repellent at dusk July to July, more so if over 60.
Mitchell County against the rest of IA
Mitchell County has the 90th longest season of 99 IA counties, at 168 days against 198 in Des Moines County and 160 in Worth County. Its mean temperature is 45.2°F.
- Cerro Gordo County: April 25 to October 11 (169 days, 0 WNV)
- Hancock County: April 26 to October 12 (169 days, 1 WNV)
- Winnebago County: April 26 to October 11 (168 days, 0 WNV)
- Allamakee County: April 27 to October 12 (168 days, 1 WNV)
West Nile in Mitchell County
From 1999 to 2025, CDC ArboNET counted 1 human West Nile case in Mitchell County (0 neuroinvasive) across 1 year. The worst was 2018 with 1; the latest was 2018.
Background: when mosquitoes go away for the winter; how the dates are worked out.