Mosquito season in Wright County, IA: when it starts and ends
Mosquito months in Wright County
In a normal year mosquito season in Wright County, IA starts around April 22 and ends around October 16, about 25 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Wright 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 16.
- 1 West Nile case since 2016 (last 2025): you should use repellent at dusk June to August, more so if over 60.
Wright County against the rest of IA
Wright County has the 59th longest season of 99 IA counties, at 177 days against 198 in Des Moines County and 160 in Worth County. Its mean temperature is 47°F.
- Calhoun County: April 22 to October 16 (177 days, 2 WNV)
- Winneshiek County: April 22 to October 16 (177 days, 0 WNV)
- Sioux County: April 21 to October 14 (176 days, 32 WNV)
- Buena Vista County: April 22 to October 15 (176 days, 2 WNV)
West Nile in Wright County
From 1999 to 2025, CDC ArboNET counted 4 human West Nile cases in Wright County (4 neuroinvasive) across 3 years. The worst was 2002 with 2; the latest was 2025.
More: how the dates are worked out · when the season starts across the US.