Mosquito season in Barnes County, ND: when it starts and ends
Mosquito months in Barnes County
In a normal year mosquito season in Barnes County, ND starts around May 6 and ends around October 2, about 21 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Barnes County, and when
- Start tipping out standing water weekly by April 22.
- Book any yard treatment for early May, ahead of the July peak.
- Repellent can go away after October 2.
- 15 West Nile cases since 2016: you should wear EPA-registered repellent at dusk July, and check ND spray notices.
Barnes County against the rest of ND
Barnes County has the 22nd longest season of 53 ND counties, at 149 days against 160 in Sheridan County and 135 in Rolette County. Its mean temperature is 40.6°F.
- Golden Valley County: May 6 to October 3 (150 days, 2 WNV)
- McLean County: May 6 to October 3 (150 days, 15 WNV)
- Eddy County: May 6 to October 1 (149 days, 0 WNV)
- Grand Forks County: May 6 to October 1 (149 days, 17 WNV)
West Nile in Barnes County
From 1999 to 2025, CDC ArboNET counted 38 human West Nile cases in Barnes County (19 neuroinvasive) across 14 years. The worst was 2012 with 9; the latest was 2025.
Background: reading the West Nile counts; how the dates are worked out.