Mosquito season in Douglas County, OR: when it starts and ends
Mosquito months in Douglas County
In a normal year mosquito season in Douglas County, OR starts around April 7 and ends around October 29, about 29 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Douglas County, and when
- Start tipping out standing water weekly by March 24.
- Book any yard treatment for early April, ahead of the July peak.
- Repellent can go away after October 29.
- No West Nile cases since 2016, so bites in Douglas County are a nuisance; check window screens.
Douglas County against the rest of OR
Douglas County has the 5th longest season of 36 OR counties, at 204 days against 225 in Curry County and 95 in Klamath County. Its mean temperature is 53.5°F.
- Coos County: April 12 to November 10 (212 days, 0 WNV)
- Josephine County: April 4 to November 1 (211 days, 0 WNV)
- Yamhill County: April 10 to October 29 (202 days, 0 WNV)
- Lane County: April 16 to October 29 (197 days, 1 WNV)
West Nile in Douglas County
From 1999 to 2025, CDC ArboNET counted 2 human West Nile cases in Douglas County (1 neuroinvasive) across 2 years. The worst was 2008 with 1; the latest was 2008.
More: how the dates are worked out · when mosquitoes go away for the winter.