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

Mosquito months in Wheeler County

In a normal year mosquito season in Wheeler County, OR starts around May 6 and ends around October 11, about 23 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 Wheeler County, and when

• Start tipping out standing water weekly by April 22.
• Book any yard treatment for early May, ahead of the July peak.
• Repellent can go away after October 11.
• No West Nile cases since 2016, so bites in Wheeler County are a nuisance; check window screens.

Wheeler County against the rest of OR

Wheeler County has the 25th longest season of 36 OR counties, at 158 days against 225 in Curry County and 95 in Klamath County. Its mean temperature is 48.1°F.

• Sherman County: April 28 to October 14 (169 days, 0 WNV)
• Jefferson County: May 2 to October 12 (163 days, 1 WNV)
• Marion County: May 10 to October 12 (155 days, 0 WNV)
• Hood River County: May 11 to October 7 (149 days, 0 WNV)

West Nile in Wheeler County

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

Background: when the season starts across the US; how the dates are worked out.