Weather
Oregon-Washington Frost Advisory: 33-36° Cold Oct 23-24
Portland, OR – Frost could spread across portions of northwest Oregon and southwest Washington early Saturday, October 24, as temperatures fall into the middle 30s under a National Weather Service Fro
By Audrey Sloan · 2026-10-23T11:04:41.513Z
Portland, OR – Frost could spread across portions of northwest Oregon and southwest Washington early Saturday, October 24, as temperatures fall into the middle 30s under a National Weather Service Frost Advisory. The approaching cold threatens sensitive outdoor plants across Portland, Vancouver and surrounding communities, including portions of the Oregon Coast and Columbia River corridor. Residents have until late Friday evening to protect vulnerable vegetation before the advisory takes effect, while another weather change is expected Sunday as rain chances climb to 70%.
According to the National Weather Service in Portland, the Frost Advisory remains scheduled from 11 p.m. Friday, October 23, until 9 a.m. Saturday. Temperatures between 33 and 36 degrees are expected across designated portions of northwest and west central Oregon and southwest Washington. Forecasters warn that frost formation could harm sensitive outdoor vegetation, with uncovered plants potentially suffering fatal damage.
Frost Advisory Covers Portland, Vancouver and Coastal Communities The advisory includes portions of the Portland metropolitan area, Clackamas County, Columbia County, the lower Columbia River corridor and coastal communities. Locations listed in the alert include Portland, Gresham, Lake Oswego, Oregon City, Troutdale, Vancouver, Camas, Washougal, Astoria, Seaside, Tillamook and Newport.
The broad coverage makes the frost threat relevant to both urban neighborhoods and smaller communities where outdoor gardens and landscaping remain exposed. However, temperatures may vary considerably by neighborhood, particularly between sheltered inland locations and areas closer to the coast.
Friday afternoon should provide relatively mild conditions before the colder night arrives. Portland is expected to reach approximately 61 degrees under sunny skies, with calm winds continuing into the evening. The city specific forecast calls for temperatures falling to around 40 degrees Friday night, while patchy fog may develop after 3 a.m.
The regional Frost Advisory's 33 to 36 degree range should not be interpreted as the expected minimum temperature at every location in Portland. Colder pockets within the advisory area may experience frost even as the downtown forecast remains closer to 40 degrees.
Sensitive Plants Face the Greatest Risk The National Weather Service advises residents to protect tender outdoor plants before temperatures fall late Friday. Sensitive potted plants should be temporarily moved indoors when practical, particularly those vulnerable to temperatures approaching freezing.
For vegetation that cannot be relocated, forecasters recommend using lightweight cotton coverings, including bedsheets or thin blankets, to help retain warmth. These coverings can provide additional protection during the coldest early morning hours.
Drivers traveling Interstate 5, Interstate 84, Interstate 205 and other Portland area roads may also encounter patchy fog Saturday morning. The forecast does not establish widespread roadway icing or confirmed travel disruptions, but localized visibility reductions could affect early travel.
Saturday afternoon brings improving conditions, with patchy fog clearing before 11 a.m. and partly sunny skies developing. Temperatures are expected to climb to approximately 62 degrees, providing a noticeable recovery from the colder morning.
Rain Returns Sunday With a 70% Chance The dry weather pattern begins changing Saturday night, when a 20% chance of rain develops after 11 p.m. Clouds increase as temperatures fall to approximately 43 degrees, setting the stage for a wetter Sunday.
Rain becomes likely Sunday, October 25, mainly after 11 a.m., with a 70% precipitation chance and temperatures reaching approximately 61 degrees. Another 70% rain chance continues Sunday night before additional rainfall remains likely Monday.
Residents should prioritize frost protection Friday evening before preparing for recurring rain through the beginning of next week.
Are you covering your outdoor plants before Saturday's frost advisory, or have you already moved sensitive vegetation indoors?
Five Day Weather Outlook Friday 10/23: Sunny skies and calm winds bring a high near 61 degrees before temperatures fall to around 40 degrees overnight, with patchy fog developing after 3 a.m. and a regional Frost Advisory beginning at 11 p.m.
Saturday 10/24: Patchy fog is expected before 11 a.m., followed by partly sunny skies and a high near 62 degrees; a 20% chance of rain develops after 11 p.m., with a low around 43 degrees.
Sunday 10/25: Rain becomes likely mainly after 11 a.m., with a 70% precipitation chance and a high near 61 degrees, followed by another 70% chance Sunday night as temperatures fall to approximately 46 degrees.
Monday 10/26: Rain remains likely under mostly cloudy skies, with afternoon temperatures reaching approximately 61 degrees; another chance of rain continues Monday night, with temperatures falling to around 45 degrees.
Tuesday 10/27: Mostly cloudy skies and a slight chance of rain are expected, with temperatures reaching approximately 60 degrees before falling to around 44 degrees Tuesday night under continued cloudy conditions.
Extended Weather Outlook Wednesday, October 28, is expected to bring mostly cloudy skies with a chance of rain and a high near 61 degrees. A slight chance of precipitation continues Wednesday night, with temperatures falling to approximately 44 degrees.
Thursday, October 29, brings partly sunny skies, a slight chance of rain and an afternoon high near 61 degrees.