Mosquito season in Golden Valley County, ND: when it starts and ends

Mosquito months in Golden Valley County

In a normal year mosquito season in Golden Valley County, ND starts around May 6 and ends around October 3, about 21 weeks.

1. Jan
2. Feb
3. Mar
4. Apr
5. May
6. Jun
7. Jul
8. Aug
9. Sep
10. Oct
11. Nov
12. Dec

What to do in Golden Valley County, and when

• Start tipping out standing water weekly by April 22.
• Book any yard treatment for early May, ahead of the July peak.
• Repellent can go away after October 3.
• 2 West Nile cases since 2016 (last 2019): you should use repellent at dusk July, more so if over 60.

Golden Valley County against the rest of ND

Golden Valley County has the 20th longest season of 53 ND counties, at 150 days against 160 in Sheridan County and 135 in Rolette County. Its mean temperature is 43.4°F.

• Wells County: May 5 to October 3 (150 days, 5 WNV)
• Billings County: May 6 to October 3 (150 days, 1 WNV)
• McLean County: May 6 to October 3 (150 days, 15 WNV)
• Barnes County: May 6 to October 2 (149 days, 15 WNV)

West Nile in Golden Valley County

From 1999 to 2025, CDC ArboNET counted 4 human West Nile cases in Golden Valley County (1 neuroinvasive) across 3 years. The worst was 2007 with 2; the latest was 2019.

Background: when the season starts across the US; how the dates are worked out.