Mosquito season in Baker County, OR: when it starts and ends
Mosquito months in Baker County
In a normal year mosquito season in Baker County, OR starts around May 8 and ends around September 27, about 20 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Baker County, and when
- Start tipping out standing water weekly by April 24.
- Book any yard treatment for early May, ahead of the July peak.
- Repellent can go away after September 27.
- 8 West Nile cases since 2016 (last 2023): you should use repellent at dusk July, more so if over 60.
Baker County against the rest of OR
Baker County has the 30th longest season of 36 OR counties, at 142 days against 225 in Curry County and 95 in Klamath County. Its mean temperature is 46.5°F.
- Harney County: May 7 to October 1 (147 days, 7 WNV)
- Wallowa County: May 11 to October 4 (146 days, 0 WNV)
- Lake County: May 10 to September 28 (141 days, 0 WNV)
- Crook County: May 12 to September 30 (141 days, 0 WNV)
West Nile in Baker County
From 1999 to 2025, CDC ArboNET counted 21 human West Nile cases in Baker County (9 neuroinvasive) across 7 years. The worst was 2006 with 8; the latest was 2023.
More: how the dates are worked out · reading the West Nile counts.