Mosquito season in Cherokee County, IA: when it starts and ends
Mosquito months in Cherokee County
In a normal year mosquito season in Cherokee County, IA starts around April 24 and ends around October 14, about 25 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Cherokee County, and when
- Start tipping out standing water weekly by April 10.
- Book any yard treatment for late April, ahead of the July peak.
- Repellent can go away after October 14.
- 3 West Nile cases since 2016 (last 2025): you should use repellent at dusk July to August, more so if over 60.
Cherokee County against the rest of IA
Cherokee County has the 80th longest season of 99 IA counties, at 173 days against 198 in Des Moines County and 160 in Worth County. Its mean temperature is 46.8°F.
- Clay County: April 23 to October 13 (173 days, 0 WNV)
- Webster County: April 23 to October 14 (173 days, 1 WNV)
- Lucas County: April 26 to October 16 (173 days, 1 WNV)
- Delaware County: April 24 to October 13 (172 days, 0 WNV)
West Nile in Cherokee County
From 1999 to 2025, CDC ArboNET counted 9 human West Nile cases in Cherokee County (3 neuroinvasive) across 5 years. The worst was 2025 with 3; the latest was 2025.
See how the dates are worked out, and when mosquitoes go away for the winter.