Frost advisory issued for Northern California until Monday morning, says the NWS

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On Monday at 1:46 a.m. the NWS Eureka CA released a frost advisory valid between 3 a.m. and 8 a.m. The advisory is for Southwestern Humboldt, Southeastern Interior Humboldt, Southern Trinity, Northwestern and Central Trinity and Northeastern Trinity.

"Temperatures as low as 33 degrees will result in frost formation," can be expected according to the NWS. "Protected valleys may see local areas of frost for several hours this morning."

"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 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 May 18, 2026 at 1:51 AM.