Mosquito season in Kossuth County, IA: when it starts and ends
Mosquito months in Kossuth County
In a normal year mosquito season in Kossuth County, IA starts around April 26 and ends around October 12, about 24 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Kossuth 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 12.
- 3 West Nile cases since 2016 (last 2025): you should use repellent at dusk July to July, more so if over 60.
Kossuth County against the rest of IA
Kossuth County has the 87th longest season of 99 IA counties, at 170 days against 198 in Des Moines County and 160 in Worth County. Its mean temperature is 45.4°F.
- Benton County: April 25 to October 12 (170 days, 0 WNV)
- Lyon County: April 25 to October 12 (170 days, 19 WNV)
- Cerro Gordo County: April 25 to October 11 (169 days, 0 WNV)
- Hancock County: April 26 to October 12 (169 days, 1 WNV)
West Nile in Kossuth County
From 1999 to 2025, CDC ArboNET counted 7 human West Nile cases in Kossuth County (4 neuroinvasive) across 6 years. The worst was 2025 with 2; the latest was 2025.
See how the dates are worked out, and when the season starts across the US.