Frost advisory in place for Southwest Washington for Thursday, says the NWS

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On Wednesday at 11:17 p.m. a frost advisory was released by the NWS Seattle WA valid for Thursday between 1 a.m. and 9 a.m. The advisory is for Foothills and Valleys of Pierce and Southern King Counties, Foothills and Valleys of Thurston and Lewis Counties and Lower Chehalis River Valley.

The NWS informs, "Temperatures as low as 32 to 36 degrees will result in frost formation."

"Frost could harm sensitive outdoor vegetation. Sensitive outdoor plants may be killed if left uncovered," comments the NWS. "Take steps now to protect tender plants from the cold."

This advisory is in effect until Thursday at 9 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 15, 2026 at 11:20 PM.