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

Mosquito months in Carver County

In a normal year mosquito season in Carver County, MN starts around April 29 and ends around October 10, about 23 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 Carver County, and when

• Start tipping out standing water weekly by April 15.
• Book any yard treatment for late April, ahead of the July peak.
• Repellent can go away after October 10.
• 11 West Nile cases since 2016: you should wear EPA-registered repellent at dusk July to July, and check MN spray notices.

Carver County against the rest of MN

Carver County has the 35th longest season of 87 MN counties, at 164 days against 176 in Winona County and 118 in Cook County. Its mean temperature is 44.3°F.

• Swift County: April 28 to October 9 (164 days, 2 WNV)
• Wright County: April 28 to October 9 (164 days, 7 WNV)
• Rice County: April 29 to October 9 (164 days, 6 WNV)
• Lac qui Parle County: April 28 to October 8 (163 days, 3 WNV)

West Nile in Carver County

From 1999 to 2025, CDC ArboNET counted 20 human West Nile cases in Carver County (9 neuroinvasive) across 9 years. The worst was 2025 with 6; the latest was 2025.

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