Weather
Oregon-Washington Weather: Frost and Freeze Risk Oct 11-12 Overnight
Portland, OR – Residents across northwest Oregon and southwest Washington are being urged to protect sensitive outdoor plants as frost and localized freezing conditions threaten parts of the region ov
By Erin Vale · 2026-10-11T20:19:58.522Z
Portland, OR – Residents across northwest Oregon and southwest Washington are being urged to protect sensitive outdoor plants as frost and localized freezing conditions threaten parts of the region overnight Sunday, Oct. 11, into Columbus Day morning.
According to the National Weather Service in Portland, clear skies, light winds and falling temperatures will create favorable conditions for frost development, especially across rural communities outside the Portland metropolitan area's urban core.
Frost Advisory Covers Much of the Region
The National Weather Service expects temperatures to fall into the low to upper 30s overnight, with frost possible across much of northwest Oregon and southwest Washington.
The greatest potential is outside urban Portland and away from coastal communities, where temperatures are expected to remain comparatively milder.
The forecast graphic identifies frost advisory areas across portions of the Willamette Valley and surrounding communities, including areas near Salem, McMinnville, Hillsboro and Eugene.
Frost can develop even when measured air temperatures remain slightly above freezing, particularly on exposed vegetation and other surfaces.
Freeze Warning for Upper Hood River Valley
A more serious temperature concern exists in the Upper Hood River Valley, where localized freezing conditions are expected.
The National Weather Service graphic identifies a freeze warning in that area, indicating temperatures could become cold enough to damage or kill vulnerable plants.
Residents with gardens, flowers and other sensitive vegetation should take precautions before temperatures drop overnight.
Protect Plants Before Monday Morning
The National Weather Service recommends bringing sensitive outdoor plants indoors or covering them when possible.
Gardeners should pay particular attention to exposed plants in rural areas, where nighttime temperatures may fall lower than in nearby urban neighborhoods.
The coldest conditions are expected overnight into Monday morning, Oct. 12, as the region begins the Columbus Day holiday.
Residents should monitor updated forecasts for their specific communities because frost and freezing conditions can vary significantly over short distances.