The National Weather Service issued a frost advisory at 9:44 p.m. on Wednesday valid from Thursday 9 p.m. until Friday 10 a.m. for North Oregon Coast Range Lowlands, Central Oregon Coast Range Lowlands, North Oregon Coast Range, Central Oregon Coast Range, Lower Columbia River, Tualatin Valley, West Hills and Chehalem Mountains, Outer Southeast Portland Metro, West Central Willamette Valley, East Central Willamette Valley, West Columbia River Gorge of Oregon above 500 ft and Clackamas County Cascade Foothills.

The weather service informs, “Temperatures as low as 33 to 36 degrees will result in frost formation.”

News Source : https://www.oregonlive.com/weather-alerts/2026/04/oregon-under-a-frost-advisory-thursday-and-friday-temperatures-could-sink-to-33.html