Freeze Warnings are in effect late Friday night into Saturday morning across the Willamette Valley, the Columbia Basin, the Yakima Valley and parts of north central Idaho.
Temperatures could fall as low as 25 degrees.
NWS Portland upgraded its Freeze Watch to a Freeze Warning, and the earlier Frost Advisory has expired.
NWS Pendleton says the cold, dry air could bring season-ending freezing temperatures to the Columbia Basin and nearby foothills.
Willamette Valley and Coast Range
NWS Portland: Freeze Warning from 11 p.m. Friday to 10 a.m. PDT Saturday.
Upgraded areas: East and West Central Willamette Valley, North Oregon Coast Range, and the Cascade foothills of Marion, Linn and Lane counties.
Also under the warning: North Oregon Coast Range Lowlands and the Benton, Linn and Lane County lowlands.
Cities include Salem, Eugene, Corvallis, Albany, Springfield, McMinnville, Keizer, Woodburn, Silverton and Cottage Grove.
Wrap or drain water pipes, or let them drip slowly.
Columbia Basin and Yakima Valley
NWS Pendleton: Freeze Warning from 11 p.m. Friday to 10 a.m. PDT Saturday.
Temperatures: sub-freezing lows of 25 to 32 degrees.
Oregon: Eastern Columbia River Gorge, Lower Columbia Basin and the foothills of the northern Blue Mountains.
Washington: Eastern Columbia River Gorge, Yakima Valley, Lower Columbia Basin and the foothills of the Blue Mountains.
Cities include Pendleton, Hermiston, Boardman, The Dalles, Walla Walla, Tri-Cities, Yakima, Sunnyside, Prosser and Dayton.
Central Washington and North Central Idaho
NWS Spokane: Freeze Warning from 1 a.m. to 10 a.m. PDT Saturday.
Temperatures: as low as 27 to 32 degrees.
Where: the Lewiston area, lower Garfield and Asotin counties, and the Moses Lake area.
Cities include Lewiston, Clarkston, Pomeroy, Moses Lake, Othello, Ephrata and Quincy.
Why It Matters
Frost and freeze conditions could kill crops and other sensitive vegetation.
They could also damage unprotected outdoor plumbing.
NWS Portland says widespread lows in the low to mid 30s are expected Thursday night through Saturday morning.
How to Protect Plants and Pipes
Take steps now to protect tender plants from the cold.
Move potted plants indoors if they are sensitive to cold.
Wrap or drain pipes, or let faucets drip slowly overnight.
Local forecasts and alerts: NWS Portland, NWS Pendleton and NWS Spokane.
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