Mosquito season in Adams County, ND: when it starts and ends
Mosquito months in Adams County
In a normal year mosquito season in Adams County, ND starts around May 13 and ends around September 27, about 20 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Adams 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 27.
- 1 West Nile case since 2016 (last 2018): you should use repellent at dusk July, more so if over 60.
Adams County against the rest of ND
Adams County has the 52nd longest season of 53 ND counties, at 137 days against 160 in Sheridan County and 135 in Rolette County. Its mean temperature is 42.8°F.
- Cavalier County: May 11 to September 26 (138 days, 1 WNV)
- Towner County: May 12 to September 26 (137 days, 0 WNV)
- Rolette County: May 13 to September 25 (135 days, 0 WNV)
West Nile in Adams County
From 1999 to 2025, CDC ArboNET counted 11 human West Nile cases in Adams County (3 neuroinvasive) across 4 years. The worst was 2003 with 7; the latest was 2018.
More: how the dates are worked out · when mosquitoes go away for the winter.