Was October 24, 2026 ragweed season over in Hillsboro?
KINDA
Kinda — first frost here is normally mid-November, but Hillsboro's 30°F low today may have ended it.
Why
- Portland's average first 32°F frost: November 19 (NOAA 1991-2020)
- Hillsboro low today about 30°F; hard freeze is 28°F
- Common ragweed is uncommon in the Willamette Valley