Skip Top Navigation

SR 20 - North Cascades Highway


Newhalem Web camera
Web camera  
Winthrop Web camera
Web camera  
West Winthrop Web camera 
  SR 20 EB entry to Winthrop

Avalanche Zones Map
Avalanche map

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.

March 2018:

The seasonal closure of SR 20/North Cascades Highway between mileposts 134 and 171 is still in effect. Crews closed the gates for the season on Nov. 10, 2017 and will reopen this spring as conditions permit.

Whenever traveling over mountain passes, for the most up to date information, check the WSDOT Mtn. Pass Report & Travel ALERTS web pages or call 5-1-1.

prepared for winter driving  conditions.
Carry tire chains, blankets, warm clothing, extra medications, food, water and other necessities for winter travel. Check weather conditions and forecasts before you travel.

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: 
November 1 until it closes  (usually around Thanksgiving) and when it reopens, we post the current North Cascades Pass conditions on our WSDOT mountain passes Web page as we do for all of the passes. May  (spring) through October (fall), 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 E. Petrich, Communications
Northwest Region-Burlington

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

North Cascades Highway Hotline
*messages left on this line are not checked regularly.