UPDATE: Frost advisory for Northern California for Thursday, says the NWS

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On Wednesday at 1:40 p.m. the NWS Eureka CA issued an updated frost advisory valid for Thursday between 2 a.m. and 8 a.m. The advisory is for Interior Del Norte, Northern Coastal Humboldt, Southwestern Humboldt, Northeastern Interior Humboldt, Southeastern Interior Humboldt, Coastal Mendocino, Northwestern Interior Mendocino, Southwestern Interior Mendocino, Southeastern Interior Mendocino, Western Lake, Southwestern Lake and Eastern Lake.

The NWS informs, "Temperatures as low as 35 degrees will result in frost formation."

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

This advisory is in effect until Thursday at 8 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 22, 2026 at 12:17 PM.