Mosquito season in Hettinger County, ND: when it starts and ends
Mosquito months in Hettinger County
In a normal year mosquito season in Hettinger County, ND starts around May 7 and ends around October 3, about 21 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Hettinger County, and when
- Start tipping out standing water weekly by April 23.
- Book any yard treatment for early May, ahead of the July peak.
- Repellent can go away after October 3.
- 5 West Nile cases since 2016 (last 2025): you should use repellent at dusk July to July, more so if over 60.
Hettinger County against the rest of ND
Hettinger County has the 28th longest season of 53 ND counties, at 149 days against 160 in Sheridan County and 135 in Rolette County. Its mean temperature is 42.9°F.
- Logan County: May 6 to October 2 (149 days, 0 WNV)
- McKenzie County: May 6 to October 2 (149 days, 12 WNV)
- Bottineau County: May 5 to September 30 (148 days, 6 WNV)
- Foster County: May 6 to October 1 (148 days, 3 WNV)
West Nile in Hettinger County
From 1999 to 2025, CDC ArboNET counted 13 human West Nile cases in Hettinger County (4 neuroinvasive) across 9 years. The worst was 2003 with 3; the latest was 2025.
Background: reading the West Nile counts; how the dates are worked out.