UPDATE: Frost advisory previously issued for Southwest Washington will expire at 9 a.m.

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The advisory was in place for Foothills and Valleys of Thurston and Lewis Counties, Olympia and Southern Puget Sound, Lowlands of Lewis and Southern Thurston counties, Middle Chehalis River Valley, Willapa and Black Hills and Lower Chehalis River Valley.

"The threat has ended," explains the NWS Seattle WA.

The advisory is in effect until 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 2, 2026 at 5:40 PM.