Mosquito season in Howard County, IA: when it starts and ends
Mosquito months in Howard County
In a normal year mosquito season in Howard County, IA starts around April 29 and ends around October 10, about 23 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Howard County, and when
- Start tipping out standing water weekly by April 15.
- Book any yard treatment for late April, ahead of the July peak.
- Repellent can go away after October 10.
- No West Nile cases since 2016, so bites in Howard County are a nuisance; check window screens.
Howard County against the rest of IA
Howard County has the 98th longest season of 99 IA counties, at 164 days against 198 in Des Moines County and 160 in Worth County. Its mean temperature is 45°F.
- Emmet County: April 27 to October 10 (166 days, 2 WNV)
- Osceola County: April 28 to October 11 (166 days, 2 WNV)
- Worth County: April 30 to October 7 (160 days, 0 WNV)
West Nile in Howard County
CDC ArboNET lists no human West Nile cases for Howard County from 1999 to 2025, though virus turned up in birds, mosquitoes or horses in 7 of those years.
More: how the dates are worked out · when the season starts across the US.