Mosquito season in Pocahontas County, IA: when it starts and ends
Mosquito months in Pocahontas County
In a normal year mosquito season in Pocahontas County, IA starts around April 22 and ends around October 15, about 25 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Pocahontas 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 15.
- 2 West Nile cases since 2016 (last 2025): you should use repellent at dusk June to August, more so if over 60.
Pocahontas County against the rest of IA
Pocahontas County has the 64th longest season of 99 IA counties, at 176 days against 198 in Des Moines County and 160 in Worth County. Its mean temperature is 46.9°F.
- Butler County: April 22 to October 15 (176 days, 1 WNV)
- Grundy County: April 22 to October 15 (176 days, 2 WNV)
- Crawford County: April 23 to October 16 (176 days, 2 WNV)
- Poweshiek County: April 23 to October 16 (176 days, 2 WNV)
West Nile in Pocahontas County
From 1999 to 2025, CDC ArboNET counted 5 human West Nile cases in Pocahontas County (3 neuroinvasive) across 4 years. The worst was 2005 with 2; the latest was 2025.
See how the dates are worked out, and when mosquitoes go away for the winter.