Mosquito season in Hood River County, OR: when it starts and ends

Mosquito months in Hood River County

In a normal year mosquito season in Hood River County, OR starts around May 11 and ends around October 7, about 21 weeks.

1. Jan
2. Feb
3. Mar
4. Apr
5. May
6. Jun
7. Jul
8. Aug
9. Sep
10. Oct
11. Nov
12. Dec

What to do in Hood River County, and when

• Start tipping out standing water weekly by April 27.
• Book any yard treatment for mid May, ahead of the July peak.
• Repellent can go away after October 7.
• No West Nile cases since 2016, so bites in Hood River County are a nuisance; check window screens.

Hood River County against the rest of OR

Hood River County has the 27th longest season of 36 OR counties, at 149 days against 225 in Curry County and 95 in Klamath County. Its mean temperature is 46.7°F.

• Wheeler County: May 6 to October 11 (158 days, 0 WNV)
• Marion County: May 10 to October 12 (155 days, 0 WNV)
• Harney County: May 7 to October 1 (147 days, 7 WNV)
• Wallowa County: May 11 to October 4 (146 days, 0 WNV)

West Nile in Hood River County

CDC ArboNET lists no human West Nile cases for Hood River County from 1999 to 2025.

See how the dates are worked out, and when mosquitoes go away for the winter.