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On Wednesday at 12:18 p.m. the NWS Eureka CA issued a frost advisory valid for Thursday between 2 a.m. and 9 a.m. The advisory is for Mendocino Coast, Northwestern Mendocino Interior, Northeastern Mendocino Interior, Southwestern Mendocino Interior, Southeastern Mendocino Interior and Southern Lake County as well as Lake County.
The NWS informs, “Temperatures as low as 33 degrees will result in frost formation.”
“Frost could harm sensitive outdoor vegetation. Sensitive outdoor plants may be killed if left uncovered,” states the NWS. “Take steps now to protect tender plants from the cold.”
This advisory is in effect until Thursday at 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 March 25, 2026 at 12:20 PM.