Mosquito season in Yellow Medicine County, MN: when it starts and ends

Mosquito months in Yellow Medicine County

In a normal year mosquito season in Yellow Medicine County, MN starts around April 28 and ends around October 10, about 24 weeks.

1. Jan
2. Feb
3. Mar
4. Apr
5. May
6. Jun
7. Jul
8. Aug
9. Sep
10. Oct
11. Nov
12. Dec

What to do in Yellow Medicine County, and when

• Start tipping out standing water weekly by April 14.
• Book any yard treatment for late April, ahead of the July peak.
• Repellent can go away after October 10.
• 6 West Nile cases since 2016 (last 2025): you should use repellent at dusk July to July, more so if over 60.

Yellow Medicine County against the rest of MN

Yellow Medicine County has the 27th longest season of 87 MN counties, at 165 days against 176 in Winona County and 118 in Cook County. Its mean temperature is 44.4°F.

• Scott County: April 28 to October 10 (165 days, 13 WNV)
• Wabasha County: April 28 to October 10 (165 days, 1 WNV)
• Anoka County: April 28 to October 9 (164 days, 23 WNV)
• Big Stone County: April 28 to October 9 (164 days, 5 WNV)

West Nile in Yellow Medicine County

From 1999 to 2025, CDC ArboNET counted 19 human West Nile cases in Yellow Medicine County (9 neuroinvasive) across 12 years. The worst was 2012 with 6; the latest was 2025.

See how the dates are worked out, and reading the West Nile counts.