Mosquito season in Benson County, ND: when it starts and ends
Mosquito months in Benson County
In a normal year mosquito season in Benson County, ND starts around May 8 and ends around September 30, about 21 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Benson County, and when
- Start tipping out standing water weekly by April 24.
- Book any yard treatment for early May, ahead of the July peak.
- Repellent can go away after September 30.
- 4 West Nile cases since 2016 (last 2024): you should use repellent at dusk July, more so if over 60.
Benson County against the rest of ND
Benson County has the 38th longest season of 53 ND counties, at 145 days against 160 in Sheridan County and 135 in Rolette County. Its mean temperature is 39.4°F.
- Nelson County: May 7 to September 30 (145 days, 1 WNV)
- Pierce County: May 7 to September 29 (145 days, 4 WNV)
- Morton County: May 8 to September 30 (145 days, 42 WNV)
- Pembina County: May 8 to September 29 (145 days, 2 WNV)
West Nile in Benson County
From 1999 to 2025, CDC ArboNET counted 19 human West Nile cases in Benson County (7 neuroinvasive) across 12 years. The worst was 2006 with 4; the latest was 2024.
More: how the dates are worked out · reading the West Nile counts.