UPDATE: Southwest Washington placed under a frost advisory Friday morning

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An updated frost advisory was released by the NWS Portland OR on Friday at 8:25 a.m. in effect until 10 a.m. The advisory is for Willapa Hills, Cowlitz County Lowlands, North Clark County Lowlands and South Washington Cascade Foothills.

"Temperatures as low as 35 degrees will result in frost formation," can be expected according to the NWS. "Continued temperatures around 36 degrees will maintain some areas of frost this morning, especially on shaded roads and surfaces. Maintain caution when traveling as some areas may be slick. As the sun rises, we will see the frost dissipate."

"Frost could harm sensitive outdoor vegetation. Sensitive outdoor plants may be killed if left uncovered," explains the NWS. "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."

This advisory is in effect until 10 a.m.

Frost advisory - this is what it means

Frost advisories are issued from May to October (but can be extended if necessary) when temperatures, winds, and sky cover are favorable for frost development. This is most likely to happen when the temperature is 36 degrees or less. In some cases, the frost is severe enough to end the growing season and is then referred to as a 'killing frost'.

According to the NWS, if a frost advisory is issued for your area, cover up sensitive plants before the sun sets so that it can help retain heat near the plants, or move the plants indoors for the night, if possible.

Source: The National Weather Service

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This story was originally published April 1, 2026 at 9:47 PM.