Frost advisory for Eastern Washington expected to expire at 7 a.m., according to the NWS

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The advisory was active for Washington Palouse, Spokane area, Northeast Mountains and Okanogan Highlands.

The advisory is in effect until 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 Spokane WA, 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 6:50 AM.