Frost advisory for Shasta Cascade for Wednesday - temperatures could sink to 33

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A frost advisory was issued by the NWS Medford OR on Monday at 10:10 p.m. valid for Wednesday between 2 a.m. and 8 a.m. The advisory is for South Central Siskiyou County, North Central and Southeast Siskiyou County and Northeast Siskiyou and Northwest Modoc counties as well as Modoc County.

The NWS informs, "Temperatures of 33 to 36 degrees will result in frost formation. Locally temperatures may drop to near or just below freeing early Wednesday morning."

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

This advisory is in effect until Wednesday 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 June 8, 2026 at 10:12 PM.