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

Mosquito months in Traverse County

In a normal year mosquito season in Traverse County, MN starts around April 28 and ends around October 9, 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 Traverse 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 9.
• 7 West Nile cases since 2016 (last 2025): you should use repellent at dusk July to July, more so if over 60.

Traverse County against the rest of MN

Traverse County has the 38th longest season of 87 MN counties, at 163 days against 176 in Winona County and 118 in Cook County. Its mean temperature is 43.7°F.

• Rice County: April 29 to October 9 (164 days, 6 WNV)
• Lac qui Parle County: April 28 to October 8 (163 days, 3 WNV)
• Jackson County: April 29 to October 9 (163 days, 3 WNV)
• Nobles County: April 29 to October 9 (163 days, 3 WNV)

West Nile in Traverse County

From 1999 to 2025, CDC ArboNET counted 22 human West Nile cases in Traverse County (7 neuroinvasive) across 12 years. The worst was 2003 with 5; the latest was 2025.

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