Mosquito season in Lane County, OR: when it starts and ends
Mosquito months in Lane County
In a normal year mosquito season in Lane County, OR starts around April 16 and ends around October 29, about 28 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Lane County, and when
- Start tipping out standing water weekly by April 2.
- Book any yard treatment for mid April, ahead of the July peak.
- Repellent can go away after October 29.
- 1 West Nile case since 2016 (last 2025): you should use repellent at dusk July, more so if over 60.
Lane County against the rest of OR
Lane County has the 7th longest season of 36 OR counties, at 197 days against 225 in Curry County and 95 in Klamath County. Its mean temperature is 52.7°F.
- Douglas County: April 7 to October 29 (204 days, 0 WNV)
- Yamhill County: April 10 to October 29 (202 days, 0 WNV)
- Lincoln County: April 27 to November 8 (195 days, 0 WNV)
- Clatsop County: April 22 to November 1 (193 days, 0 WNV)
West Nile in Lane County
From 1999 to 2025, CDC ArboNET counted 4 human West Nile cases in Lane County (3 neuroinvasive) across 4 years. The worst was 2025 with 1; the latest was 2025.
Background: when the season starts across the US; how the dates are worked out.