Portland, OR — The National Weather Service in Portland (NWS) has issued a Frost Advisory for parts of northwest Oregon and southwest Washington, warning residents to prepare for temperatures dipping into the low 30s overnight. The advisory remains in effect from midnight through 9 a.m. Tuesday, October 14, 2025.
According to the National Weather Service Portland office, clear skies and calm winds will create ideal conditions for widespread frost formation late Monday night through early Tuesday morning.
Areas Under the Advisory
The Frost Advisory includes the Lower Columbia River region, Tualatin Valley, Benton County lowlands, Cascade foothills of Marion and Linn Counties, and the Inner Vancouver Metro as well as the North Clark County lowlands.
Forecasters emphasize that these areas, particularly rural and low-lying regions, are more prone to frost accumulation because cold air tends to settle in valleys during overnight calm periods.
What to Expect Overnight
Temperatures are forecast to drop into the low to mid-30s, creating conditions that could damage or kill sensitive plants if left uncovered. The NWS advises residents to bring potted plants indoors or cover outdoor vegetation using lightweight blankets or fabric for protection.
Gardeners and farmers are urged to take precautions, as frost-sensitive crops like tomatoes, peppers, and flowers could sustain irreversible cold injury.
“Under clear skies and light winds, frost will form easily overnight, especially in sheltered areas,” the NWS said in a statement Monday afternoon.
When Conditions Will Improve
The chilly temperatures are expected to linger through early Tuesday morning, before rising into the 50s and 60s as the day progresses. By late morning, sunshine will return, melting any frost and bringing pleasant afternoon conditions to much of the region.
Weather models indicate dry and sunny weather through midweek, but another cold night could occur again on Tuesday night into Wednesday morning, particularly in rural areas.
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How to Protect Plants and Property
Residents should take simple precautions tonight to minimize frost damage:
- Move sensitive or potted plants indoors or into garages.
- Cover garden beds with sheets, burlap, or frost cloth to trap heat.
- Avoid using plastic covers, which can trap moisture and harm plants.
- If possible, run irrigation systems briefly before sunset — moist soil retains heat better than dry ground.
Homeowners should also disconnect hoses and drain outdoor faucets to prevent freezing in exposed pipes.
Final Word
Residents across northwest Oregon and southwest Washington should stay alert for freezing overnight temperatures and prepare accordingly. Even short-term frost events can cause significant losses for gardeners and farmers.
Keep an eye on the latest updates from the NWS Portland office, and share your local weather experiences in the comments section on hamiltonpawprint.com.
