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SR 20 - North Cascades Highway


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  SR 20 EB entry to Winthrop

Avalanche Zones Map
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State Route 20 is the northernmost route across the Cascade Mountain Range in Washington and is commonly referred to as the North Cascades Highway. This Scenic Byway offers travelers a wide array of beautiful vistas and is part of the Cascade Loop , a 400-mile driving tour through the Cascades. Take a virtual drive on the highway from your computer.

April 21, 2017

SR 20 remains closed between mileposts 134 and 171 but the spring reopening work is now entering week 3.  

Clearing work may take as many as 8 weeks which would be the latest since 1974's June 14 reopening.

During the clearing, pedestrians (skiers) & bicyclists are prohibited Monday through Thursday, but allowed past the gates Friday through Sunday.

Why we close the highway in winter:
We close the North Cascades when weather, snow conditions and avalanche danger threaten the safety of drivers and our maintenance crews. We close the highway on the west side at milepost 134, east of Diablo, and on the east side at milepost 171, 14 miles west of Mazama. As the snow gets too deep for the plow truck, the east closure point is moved 7 miles down to the Early Winters Information Center at milepost 178. Avalanches typically close the highway between late November and mid December.
Reopening in the spring is usually accomplished by early May.

Current driving conditions: 
Starting November 1 until it closes and when it opens, we post the current North Cascades Pass conditions on our WSDOT mountain passes Web page as we do for all of the passes. May through October, pass conditions are only posted if there's a potential travel hazard.

Current weather conditions:
For recreation purposes and while the highway is closed, or in the summer when the pass reports are suspended, you can find weather information with these links:

Jeff Adamson , Communications
North Central Region-Wenatchee
Andrea Petrich, Communications
Northwest Region-Burlington

Sign up for spring reopening email updates for the North Cascades Highway

North Cascades Highway Hotline


, Communications North Central Region-Wenatchee