Mosquito season in Jackson County, OR: when it starts and ends
Mosquito months in Jackson County
In a normal year mosquito season in Jackson County, OR starts around April 26 and ends around October 24, about 26 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Jackson 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 24.
- 3 West Nile cases since 2016 (last 2023): you should use repellent at dusk July to August, more so if over 60.
Jackson County against the rest of OR
Jackson County has the 15th longest season of 36 OR counties, at 181 days against 225 in Curry County and 95 in Klamath County. Its mean temperature is 53.3°F.
- Morrow County: April 18 to October 20 (185 days, 0 WNV)
- Linn County: April 22 to October 22 (183 days, 0 WNV)
- Wasco County: April 24 to October 16 (175 days, 0 WNV)
- Columbia County: April 25 to October 18 (175 days, 1 WNV)
West Nile in Jackson County
From 1999 to 2025, CDC ArboNET counted 4 human West Nile cases in Jackson County (1 neuroinvasive) across 4 years. The worst was 2023 with 1; the latest was 2023.
Background: when mosquitoes go away for the winter; how the dates are worked out.