Mosquito season in Bear Lake County, ID: when it starts and ends
Mosquito months in Bear Lake County
In a normal year mosquito season in Bear Lake County, ID starts around May 25 and ends around September 16, about 16 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Bear Lake County, and when
- Start tipping out standing water weekly by May 11.
- Book any yard treatment for late May, ahead of the July peak.
- Repellent can go away after September 16.
- No West Nile cases since 2016, so bites in Bear Lake County are a nuisance; check window screens.
Bear Lake County against the rest of ID
Bear Lake County has the 35th longest season of 44 ID counties, at 114 days against 194 in Canyon County and 85 in Fremont County. Its mean temperature is 41.3°F.
- Teton County: May 22 to September 20 (121 days, 1 WNV)
- Valley County: May 30 to September 23 (116 days, 1 WNV)
- Camas County: May 28 to September 19 (114 days, 0 WNV)
- Elmore County: May 30 to September 18 (111 days, 4 WNV)
West Nile in Bear Lake County
CDC ArboNET lists no human West Nile cases for Bear Lake County from 1999 to 2025, though virus turned up in birds, mosquitoes or horses in 4 of those years.
Background: when the season starts across the US; how the dates are worked out.