Portland, Oregon – Gardeners across northwest Oregon should prepare for potential frost damage as temperatures dip into the low 30s overnight, triggering a Frost Advisory from midnight to 9 a.m. Tuesday across the Willamette Valley, Cascade foothills, and surrounding areas.
According to the National Weather Service in Portland, temperatures between 33°F and 36°F are expected to cause frost formation across a broad region—including the Tualatin Valley, outer southeast Portland metro, and the Columbia River Gorge above 500 feet. The advisory also covers Benton, Linn, and Lane counties, as well as parts of southwest Washington including Cowlitz and North Clark County.
Sensitive outdoor vegetation may be harmed or killed if left unprotected. Residents in cities such as Salem, Eugene, Hillsboro, and Longview are urged to bring potted plants indoors or cover delicate garden vegetation with lightweight fabric like bedsheets or thin blankets to retain heat.
This late-season chill comes as many across the region have already begun spring planting, heightening the risk for newly budding crops and flowers. Similar April cold snaps have caused agricultural losses in previous years, especially in elevated or rural areas.
Frost risk will ease by mid-morning Tuesday, but more advisories are possible later this week if cold air lingers.
