Frost advisory for Southwest Washington until Saturday morning, says the NWS

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The NWS Seattle WA released a frost advisory at 2:35 a.m. on Friday valid from 11 p.m. until Saturday 10 a.m. The advisory is for Lowlands of Pierce and Southern King counties, Olympia and Southern Puget Sound, Lowlands of Lewis and Southern Thurston counties and Southern Hood Canal.

The NWS informs, "Temperatures as low as 32 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 Saturday at 10 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 24, 2026 at 2:38 AM.