Mosquito season in Jackson County, IA: when it starts and ends
Mosquito months in Jackson County
In a normal year mosquito season in Jackson County, IA starts around April 21 and ends around October 17, about 26 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Jackson County, and when
- Start tipping out standing water weekly by April 7.
- Book any yard treatment for late April, ahead of the July peak.
- Repellent can go away after October 17.
- No West Nile cases since 2016, so bites in Jackson County are a nuisance; check window screens.
Jackson County against the rest of IA
Jackson County has the 49th longest season of 99 IA counties, at 179 days against 198 in Des Moines County and 160 in Worth County. Its mean temperature is 48°F.
- Monona County: April 20 to October 17 (180 days, 2 WNV)
- Marshall County: April 20 to October 16 (179 days, 1 WNV)
- Madison County: April 20 to October 15 (178 days, 0 WNV)
- Woodbury County: April 20 to October 15 (178 days, 18 WNV)
West Nile in Jackson County
From 1999 to 2025, CDC ArboNET counted 3 human West Nile cases in Jackson County (2 neuroinvasive) across 3 years. The worst was 2007 with 1; the latest was 2007.
Background: when the season starts across the US; how the dates are worked out.