Mosquito season in Chickasaw County, IA: when it starts and ends
Mosquito months in Chickasaw County
In a normal year mosquito season in Chickasaw County, IA starts around April 27 and ends around October 10, about 24 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Chickasaw County, and when
- Start tipping out standing water weekly by April 13.
- Book any yard treatment for late April, ahead of the July peak.
- Repellent can go away after October 10.
- 2 West Nile cases since 2016 (last 2024): you should use repellent at dusk July to July, more so if over 60.
Chickasaw County against the rest of IA
Chickasaw County has the 95th longest season of 99 IA counties, at 166 days against 198 in Des Moines County and 160 in Worth County. Its mean temperature is 44.7°F.
- Clayton County: April 27 to October 11 (167 days, 0 WNV)
- Fayette County: April 27 to October 11 (167 days, 1 WNV)
- Emmet County: April 27 to October 10 (166 days, 2 WNV)
- Osceola County: April 28 to October 11 (166 days, 2 WNV)
West Nile in Chickasaw County
From 1999 to 2025, CDC ArboNET counted 5 human West Nile cases in Chickasaw County (3 neuroinvasive) across 5 years. The worst was 2024 with 1; the latest was 2024.
More: how the dates are worked out · when mosquitoes go away for the winter.