UPDATE: The current frost advisory for Western Washington will be expiring at 9 a.m.

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The advisory was issued for Foothills and Valleys of the North Cascades, Foothills and Valleys of Snohomish and Northern King Counties, Foothills and Valleys of Central King County, Foothills and Valleys of Pierce and Southern King Counties, Foothills and Valleys of Thurston and Lewis Counties, Lowlands of Western Whatcom County, Downtown Everett / Marysville Area, Olympia and Southern Puget Sound, Lowlands of Lewis and Southern Thurston counties, Middle Chehalis River Valley, Willapa and Black Hills, Eastern Strait of Juan de Fuca, Lake Crescent Area Including US 101 and Foothills of the Western and Southern Olympic Peninsula.

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

The advisory is in effect until 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 12:54 AM.