Mosquito season in Floyd County, IA: when it starts and ends
Mosquito months in Floyd County
In a normal year mosquito season in Floyd County, IA starts around April 22 and ends around October 14, about 25 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Floyd 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 14.
- 1 West Nile case since 2016 (last 2018): you should use repellent at dusk July to July, more so if over 60.
Floyd County against the rest of IA
Floyd County has the 73rd longest season of 99 IA counties, at 174 days against 198 in Des Moines County and 160 in Worth County. Its mean temperature is 46.4°F.
- Hardin County: April 23 to October 15 (175 days, 2 WNV)
- Humboldt County: April 23 to October 15 (175 days, 3 WNV)
- Bremer County: April 23 to October 14 (174 days, 4 WNV)
- Franklin County: April 23 to October 15 (174 days, 1 WNV)
West Nile in Floyd County
From 1999 to 2025, CDC ArboNET counted 5 human West Nile cases in Floyd County (3 neuroinvasive) across 4 years. The worst was 2003 with 2; the latest was 2018.
More: how the dates are worked out · when mosquitoes go away for the winter.