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

Mosquito months in Scott County

In a normal year mosquito season in Scott 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 Scott 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.
• 13 West Nile cases since 2016: you should wear EPA-registered repellent at dusk July to July, and check MN spray notices.

Scott County against the rest of MN

Scott County has the 25th longest season of 87 MN counties, at 165 days against 176 in Winona County and 118 in Cook County. Its mean temperature is 44.5°F.

• Isanti County: April 27 to October 9 (165 days, 1 WNV)
• McLeod County: April 27 to October 10 (165 days, 4 WNV)
• Wabasha County: April 28 to October 10 (165 days, 1 WNV)
• Yellow Medicine County: April 28 to October 10 (165 days, 6 WNV)

West Nile in Scott County

From 1999 to 2025, CDC ArboNET counted 23 human West Nile cases in Scott County (12 neuroinvasive) across 11 years. The worst was 2025 with 8; the latest was 2025.

More: how the dates are worked out · reading the West Nile counts.