Mosquito season in Burleigh County, ND: when it starts and ends
Mosquito months in Burleigh County
In a normal year mosquito season in Burleigh County, ND starts around May 4 and ends around October 4, about 22 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Burleigh 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 4.
- 128 West Nile cases since 2016: you should wear EPA-registered repellent at dusk July to July, and check ND spray notices.
Burleigh County against the rest of ND
Burleigh County has the 10th longest season of 53 ND counties, at 154 days against 160 in Sheridan County and 135 in Rolette County. Its mean temperature is 42.7°F.
- Cass County: May 3 to October 4 (154 days, 79 WNV)
- Emmons County: May 3 to October 4 (154 days, 4 WNV)
- Sargent County: May 3 to October 4 (153 days, 8 WNV)
- Ransom County: May 4 to October 3 (153 days, 4 WNV)
West Nile in Burleigh County
From 1999 to 2025, CDC ArboNET counted 416 human West Nile cases in Burleigh County (93 neuroinvasive) across 21 years. The worst was 2003 with 98; the latest was 2025.
Background: reading the West Nile counts; how the dates are worked out.