Frost advisory in place for Eastern Washington for Monday, says the NWS

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On Sunday at 10:10 a.m. the NWS Spokane WA released a frost advisory valid for Monday between 2 a.m. and 7 a.m. The advisory is for Washington Palouse, Spokane area, Northeast Mountains and Okanogan Highlands.

The NWS informs, "Low temperatures between 31 and 37 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 Monday at 7 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 May 17, 2026 at 10:15 AM.