Mosquito season in Bonner County, ID: when it starts and ends
Mosquito months in Bonner County
In a normal year mosquito season in Bonner County, ID starts around May 3 and ends around October 1, about 22 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Bonner County, and when
- Start tipping out standing water weekly by April 19.
- Book any yard treatment for early May, ahead of the July peak.
- Repellent can go away after October 1.
- No West Nile cases since 2016, so bites in Bonner County are a nuisance; check window screens.
Bonner County against the rest of ID
Bonner County has the 22nd longest season of 44 ID counties, at 151 days against 194 in Canyon County and 85 in Fremont County. Its mean temperature is 45.6°F.
- Owyhee County: May 9 to October 9 (153 days, 11 WNV)
- Lincoln County: May 8 to October 7 (152 days, 2 WNV)
- Oneida County: May 4 to October 2 (151 days, 0 WNV)
- Madison County: May 5 to October 3 (151 days, 0 WNV)
West Nile in Bonner County
CDC ArboNET lists no human West Nile cases for Bonner County from 1999 to 2025, though virus turned up in birds, mosquitoes or horses in 2 of those years.
More: how the dates are worked out · when the season starts across the US.