Mosquito season in Tillamook County, OR: when it starts and ends
Mosquito months in Tillamook County
In a normal year mosquito season in Tillamook County, OR starts around May 3 and ends around October 25, about 25 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Tillamook County, and when
- Start tipping out standing water weekly by April 19.
- Book any yard treatment for early May, ahead of the August peak.
- Repellent can go away after October 25.
- No West Nile cases since 2016, so bites in Tillamook County are a nuisance; check window screens.
Tillamook County against the rest of OR
Tillamook County has the 18th 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.
- Wasco County: April 24 to October 16 (175 days, 0 WNV)
- Columbia County: April 25 to October 18 (175 days, 1 WNV)
- Benton County: April 27 to October 18 (174 days, 2 WNV)
- Clackamas County: April 29 to October 17 (172 days, 1 WNV)
West Nile in Tillamook County
CDC ArboNET lists no human West Nile cases for Tillamook County from 1999 to 2025.
More: how the dates are worked out · when the season starts across the US.