Mosquito season in Houston County, MN: when it starts and ends
Mosquito months in Houston County
In a normal year mosquito season in Houston County, MN starts around April 27 and ends around October 12, about 24 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Houston County, and when
- Start tipping out standing water weekly by April 13.
- Book any yard treatment for late April, ahead of the July peak.
- Repellent can go away after October 12.
- 1 West Nile case since 2016 (last 2023): you should use repellent at dusk July to July, more so if over 60.
Houston County against the rest of MN
Houston County has the 11th longest season of 87 MN counties, at 168 days against 176 in Winona County and 118 in Cook County. Its mean temperature is 45.4°F.
- Watonwan County: April 26 to October 12 (169 days, 2 WNV)
- Brown County: April 26 to October 11 (168 days, 1 WNV)
- Dakota County: April 26 to October 11 (167 days, 26 WNV)
- Freeborn County: April 26 to October 11 (167 days, 1 WNV)
West Nile in Houston County
From 1999 to 2025, CDC ArboNET counted 1 human West Nile case in Houston County (1 neuroinvasive) across 1 year. The worst was 2023 with 1; the latest was 2023.
Background: when the season starts across the US; how the dates are worked out.