In effect from Tuesday, Oct 14 2025 2:36 PM - Wednesday, Oct 15 2025 5:15 AM
Issued by NWS Portland OR
What:
Temperatures of 32 to 36 degrees will result in frost
formation.
Where:
South Willamette Valley, North Oregon Coast Range
Lowlands, East Central Willamette Valley, and Cowlitz County
Lowlands.
When:
From 1 AM to 9 AM PDT Wednesday.
Impacts:
Frost could harm sensitive outdoor vegetation. Sensitive
outdoor plants may be killed if left uncovered.
Additional Details:
The Nehalem River Valley, including Vernonia
and Pittsburg, is the most likely area within the Coast Range to
see temperatures fall below freezing. In those areas, there is a
70 to 90% chance of a true freeze, and a nearly 100% chance of
frost, so those with agricultural interests or sensitive outdoor
plants should take more substantial preventative measures.
Instructions: Take steps now to protect tender outdoor plants from the cold.
Consider temporarily moving outdoor potted plants indoors if they
are sensitive to cold temperatures.
Consider temporarily covering sensitive plants with a lightweight
cotton fabric (i.e., bedsheets, thin blankets), as this will help
retain heat and provide frost protection for your plants.
