Mosquito season in Wasco County, OR: when it starts and ends
Mosquito months in Wasco County
In a normal year mosquito season in Wasco County, OR starts around April 24 and ends around October 16, about 25 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Wasco County, and when
- Start tipping out standing water weekly by April 10.
- Book any yard treatment for late April, ahead of the July peak.
- Repellent can go away after October 16.
- No West Nile cases since 2016, so bites in Wasco County are a nuisance; check window screens.
Wasco County against the rest of OR
Wasco County has the 16th longest season of 36 OR counties, at 175 days against 225 in Curry County and 95 in Klamath County. Its mean temperature is 50.4°F.
- Linn County: April 22 to October 22 (183 days, 0 WNV)
- Jackson County: April 26 to October 24 (181 days, 3 WNV)
- Columbia County: April 25 to October 18 (175 days, 1 WNV)
- Tillamook County: May 3 to October 25 (175 days, 0 WNV)
West Nile in Wasco County
CDC ArboNET lists no human West Nile cases for Wasco County from 1999 to 2025.
More: how the dates are worked out · when mosquitoes go away for the winter.