Mosquito season in Bowman County, ND: when it starts and ends
Mosquito months in Bowman County
In a normal year mosquito season in Bowman County, ND starts around May 9 and ends around October 2, about 21 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Bowman County, and when
- Start tipping out standing water weekly by April 25.
- Book any yard treatment for early May, ahead of the July peak.
- Repellent can go away after October 2.
- 3 West Nile cases since 2016 (last 2018): you should use repellent at dusk July, more so if over 60.
Bowman County against the rest of ND
Bowman County has the 41st longest season of 53 ND counties, at 145 days against 160 in Sheridan County and 135 in Rolette County. Its mean temperature is 42.7°F.
- Morton County: May 8 to September 30 (145 days, 42 WNV)
- Pembina County: May 8 to September 29 (145 days, 2 WNV)
- Dunn County: May 9 to September 30 (144 days, 3 WNV)
- Grant County: May 11 to October 2 (144 days, 1 WNV)
West Nile in Bowman County
From 1999 to 2025, CDC ArboNET counted 22 human West Nile cases in Bowman County (2 neuroinvasive) across 5 years. The worst was 2003 with 11; the latest was 2018.
See how the dates are worked out, and when mosquitoes go away for the winter.