Mosquito season in Ward County, ND: when it starts and ends
Mosquito months in Ward County
In a normal year mosquito season in Ward County, ND starts around May 4 and ends around October 2, about 22 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Ward County, and when
- Start tipping out standing water weekly by April 20.
- Book any yard treatment for early May, ahead of the July peak.
- Repellent can go away after October 2.
- 35 West Nile cases since 2016: you should wear EPA-registered repellent at dusk July, and check ND spray notices.
Ward County against the rest of ND
Ward County has the 17th longest season of 53 ND counties, at 151 days against 160 in Sheridan County and 135 in Rolette County. Its mean temperature is 41.6°F.
- Slope County: May 5 to October 5 (152 days, 0 WNV)
- McHenry County: May 4 to October 2 (151 days, 14 WNV)
- Wells County: May 5 to October 3 (150 days, 5 WNV)
- Billings County: May 6 to October 3 (150 days, 1 WNV)
West Nile in Ward County
From 1999 to 2025, CDC ArboNET counted 124 human West Nile cases in Ward County (32 neuroinvasive) across 16 years. The worst was 2003 with 44; the latest was 2025.
More: how the dates are worked out · reading the West Nile counts.