Archive note, Nov. 1, 2026: The advisory period described below ended at 9 a.m. Oct. 31. Check NWS Seattle for current forecasts and alerts. The original report follows.
Gardeners in Marysville, Arlington, Stanwood and other parts of Snohomish County should protect tender plants before an overnight frost advisory takes effect early Saturday, Oct. 31.
The National Weather Service in Seattle issued the advisory at 5:43 p.m. Friday. It covers midnight to 9 a.m. Saturday, with temperatures forecast to fall as low as 34°F. Clearing skies and local fog development could cause temperatures to vary from place to place.
Which communities are covered?
The Seattle weather bulletin names Marysville, Lake Stevens, Granite Falls and Darrington among the affected communities. The agency’s current forecasts for Arlington and Stanwood also display the advisory.
NWS says frost could damage sensitive outdoor vegetation, and uncovered plants may be killed.
What to do before the cold arrives
Bring sensitive potted plants indoors where practical, or cover tender outdoor plants before the overnight chill. Those are among the protective steps in the weather service’s frost and freeze guidance.
Check the NWS Seattle forecast and alerts for your location before heading out Saturday morning. This advisory applies to the morning of Oct. 31; later forecasts may change.
Information checked Friday evening, Oct. 30. Source: National Weather Service advisory issued at 5:43 p.m. PDT.
