Mosquito season in Dunn County, ND: when it starts and ends
Mosquito months in Dunn County
In a normal year mosquito season in Dunn County, ND starts around May 9 and ends around September 30, about 21 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Dunn County, and when
- Start tipping out standing water weekly by April 25.
- Book any yard treatment for early May, ahead of the July peak.
- Repellent can go away after September 30.
- 3 West Nile cases since 2016 (last 2024): you should use repellent at dusk July, more so if over 60.
Dunn County against the rest of ND
Dunn County has the 42nd longest season of 53 ND counties, at 144 days against 160 in Sheridan County and 135 in Rolette County. Its mean temperature is 41.4°F.
- Pembina County: May 8 to September 29 (145 days, 2 WNV)
- Bowman County: May 9 to October 2 (145 days, 3 WNV)
- Grant County: May 11 to October 2 (144 days, 1 WNV)
- Renville County: May 9 to September 28 (142 days, 0 WNV)
West Nile in Dunn County
From 1999 to 2025, CDC ArboNET counted 23 human West Nile cases in Dunn County (6 neuroinvasive) across 7 years. The worst was 2003 with 13; the latest was 2024.
See how the dates are worked out, and when the season starts across the US.