Mosquito season in Martin County, MN: when it starts and ends
Mosquito months in Martin County
In a normal year mosquito season in Martin County, MN starts around April 25 and ends around October 13, about 24 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Martin County, and when
- Start tipping out standing water weekly by April 11.
- Book any yard treatment for late April, ahead of the July peak.
- Repellent can go away after October 13.
- 6 West Nile cases since 2016 (last 2025): you should use repellent at dusk July to August, more so if over 60.
Martin County against the rest of MN
Martin County has the 6th longest season of 87 MN counties, at 171 days against 176 in Winona County and 118 in Cook County. Its mean temperature is 45.8°F.
- Ramsey County: April 24 to October 13 (172 days, 20 WNV)
- Cottonwood County: April 25 to October 13 (171 days, 7 WNV)
- Rock County: April 25 to October 12 (170 days, 7 WNV)
- Hennepin County: April 25 to October 11 (169 days, 67 WNV)
West Nile in Martin County
From 1999 to 2025, CDC ArboNET counted 8 human West Nile cases in Martin County (4 neuroinvasive) across 6 years. The worst was 2023 with 2; the latest was 2025.
Background: reading the West Nile counts; how the dates are worked out.