Mosquito season in Sherburne County, MN: when it starts and ends
Mosquito months in Sherburne County
In a normal year mosquito season in Sherburne County, MN starts around April 29 and ends around October 8, about 23 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Sherburne 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 8.
- 5 West Nile cases since 2016 (last 2025): you should use repellent at dusk July to July, more so if over 60.
Sherburne County against the rest of MN
Sherburne County has the 42nd longest season of 87 MN counties, at 162 days against 176 in Winona County and 118 in Cook County. Its mean temperature is 43.6°F.
- Nobles County: April 29 to October 9 (163 days, 3 WNV)
- Goodhue County: April 29 to October 8 (162 days, 1 WNV)
- Mower County: April 30 to October 8 (161 days, 0 WNV)
- Renville County: April 30 to October 7 (161 days, 5 WNV)
West Nile in Sherburne County
From 1999 to 2025, CDC ArboNET counted 11 human West Nile cases in Sherburne County (5 neuroinvasive) across 7 years. The worst was 2003 with 3; the latest was 2025.
More: how the dates are worked out · reading the West Nile counts.