Mosquito season in Linn County, OR: when it starts and ends
Mosquito months in Linn County
In a normal year mosquito season in Linn County, OR starts around April 22 and ends around October 22, about 26 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Linn County, and when
- Start tipping out standing water weekly by April 8.
- Book any yard treatment for late April, ahead of the August peak.
- Repellent can go away after October 22.
- No West Nile cases since 2016, so bites in Linn County are a nuisance; check window screens.
Linn County against the rest of OR
Linn County has the 14th longest season of 36 OR counties, at 183 days against 225 in Curry County and 95 in Klamath County. Its mean temperature is 51.3°F.
- Polk County: April 22 to October 26 (186 days, 0 WNV)
- Morrow County: April 18 to October 20 (185 days, 0 WNV)
- Jackson County: April 26 to October 24 (181 days, 3 WNV)
- Wasco County: April 24 to October 16 (175 days, 0 WNV)
West Nile in Linn County
From 1999 to 2025, CDC ArboNET counted 2 human West Nile cases in Linn County (1 neuroinvasive) across 2 years. The worst was 2014 with 1; the latest was 2014.
See how the dates are worked out, and when mosquitoes go away for the winter.