Mosquito season in Rolette County, ND: when it starts and ends
Mosquito months in Rolette County
In a normal year mosquito season in Rolette County, ND starts around May 13 and ends around September 25, about 19 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Rolette County, and when
- Start tipping out standing water weekly by April 29.
- Book any yard treatment for mid May, ahead of the July peak.
- Repellent can go away after September 25.
- No West Nile cases since 2016, so bites in Rolette County are a nuisance; check window screens.
Rolette County against the rest of ND
Rolette County has the 53rd longest season of 53 ND counties, at 135 days against 160 in Sheridan County and 135 in Rolette County. Its mean temperature is 37°F.
- Towner County: May 12 to September 26 (137 days, 0 WNV)
- Adams County: May 13 to September 27 (137 days, 1 WNV)
West Nile in Rolette County
From 1999 to 2025, CDC ArboNET counted 7 human West Nile cases in Rolette County (2 neuroinvasive) across 3 years. The worst was 2007 with 3; the latest was 2007.
See how the dates are worked out, and when the season starts across the US.