Mosquito season in Stutsman County, ND: when it starts and ends
Mosquito months in Stutsman County
In a normal year mosquito season in Stutsman County, ND starts around May 4 and ends around October 3, about 22 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Stutsman 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 3.
- 20 West Nile cases since 2016: you should wear EPA-registered repellent at dusk July, and check ND spray notices.
Stutsman County against the rest of ND
Stutsman County has the 14th longest season of 53 ND counties, at 152 days against 160 in Sheridan County and 135 in Rolette County. Its mean temperature is 41.5°F.
- Ransom County: May 4 to October 3 (153 days, 4 WNV)
- Oliver County: May 4 to October 3 (152 days, 1 WNV)
- Slope County: May 5 to October 5 (152 days, 0 WNV)
- McHenry County: May 4 to October 2 (151 days, 14 WNV)
West Nile in Stutsman County
From 1999 to 2025, CDC ArboNET counted 102 human West Nile cases in Stutsman County (26 neuroinvasive) across 20 years. The worst was 2003 with 30; the latest was 2025.
Background: reading the West Nile counts; how the dates are worked out.