Mosquito season in Gilliam County, OR: when it starts and ends
Mosquito months in Gilliam County
In a normal year mosquito season in Gilliam County, OR starts around April 26 and ends around October 14, about 24 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Gilliam County, and when
- Start tipping out standing water weekly by April 12.
- Book any yard treatment for late April, ahead of the July peak.
- Repellent can go away after October 14.
- No West Nile cases since 2016, so bites in Gilliam County are a nuisance; check window screens.
Gilliam County against the rest of OR
Gilliam County has the 21st longest season of 36 OR counties, at 171 days against 225 in Curry County and 95 in Klamath County. Its mean temperature is 49.5°F.
- Benton County: April 27 to October 18 (174 days, 2 WNV)
- Clackamas County: April 29 to October 17 (172 days, 1 WNV)
- Union County: April 26 to October 12 (169 days, 0 WNV)
- Sherman County: April 28 to October 14 (169 days, 0 WNV)
West Nile in Gilliam County
CDC ArboNET lists no human West Nile cases for Gilliam County from 1999 to 2025.
See how the dates are worked out, and when mosquitoes go away for the winter.