Mosquito season in Bottineau County, ND: when it starts and ends
Mosquito months in Bottineau County
In a normal year mosquito season in Bottineau County, ND starts around May 5 and ends around September 30, about 21 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Bottineau County, and when
- Start tipping out standing water weekly by April 21.
- Book any yard treatment for early May, ahead of the July peak.
- Repellent can go away after September 30.
- 6 West Nile cases since 2016 (last 2025): you should use repellent at dusk July, more so if over 60.
Bottineau County against the rest of ND
Bottineau County has the 29th longest season of 53 ND counties, at 148 days against 160 in Sheridan County and 135 in Rolette County. Its mean temperature is 39.7°F.
- McKenzie County: May 6 to October 2 (149 days, 12 WNV)
- Hettinger County: May 7 to October 3 (149 days, 5 WNV)
- Foster County: May 6 to October 1 (148 days, 3 WNV)
- McIntosh County: May 7 to October 2 (148 days, 4 WNV)
West Nile in Bottineau County
From 1999 to 2025, CDC ArboNET counted 18 human West Nile cases in Bottineau County (8 neuroinvasive) across 11 years. The worst was 2003 with 5; the latest was 2025.
More: how the dates are worked out · reading the West Nile counts.