UPDATE: Frost advisory issued for Southwest Washington until Wednesday morning

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The NWS Portland OR released an updated frost advisory at 9:21 a.m. on Tuesday valid from 11 p.m. until Wednesday 9 a.m. The advisory is for Willapa and Wahkiakum Lowlands, Willapa Hills, Cowlitz County Lowlands, North Clark County Lowlands and South Washington Cascade Foothills.

The NWS informs, "Temperatures as low as 33 to 36 degrees will result in frost formation."

"Frost could harm sensitive outdoor vegetation. Sensitive outdoor plants may be killed if left uncovered," states 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 Wednesday at 9 a.m.

What to do if there is a frost advisory

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 7, 2026 at 1:03 AM.