Seasonal closure · SR-20 · Washington
Closing date varies by year. The 2025 closure was Dec. 4. Below: what the WSDOT feed is posting for SR-20 right now, and the dates WSDOT gives, quoted from its own page.
“Rainy Pass and Washington Pass will close between Ross Dam trailhead (milepost 134) and Silver Star gate (milepost 171). The earliest closing date for the North Cascades Highway was Oct. 17, 2007. The latest seasonal closure date was Jan. 3, 1990.”
Source: wsdot.wa.gov/about/news/2025/sr-20-north-cascades-highway-closes-season-thursday-dec-4-6-pm, read October 2, 2026.
Washington's DOT traveler site. The list of record for closures, restrictions and detours.
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Date varies; WSDOT cites earliest Oct. 17, 2007 and latest Jan. 3, 1990 (2025 closure was Dec. 4) That is what WSDOT publishes, read October 2, 2026. The gate goes in when the snow does, so the date moves from year to year. No 2026-27 dates were posted on the source page when it was read.
The source page gives no date. Plowing and avalanche work set the day, and the agency announces it when the road is ready.
Closure points: Ross Dam trailhead (MP 134) to Silver Star gate (MP 171), later moved to Newhalem gate (MP 120) and Early Winters gate (MP 178). The rest of SR-20 is handled like any other road in Washington.
WSDOT is the official source for the state highway. The block at the top of this page reads the same WSDOT feed every five minutes and lists what is posted for SR-20. If the feed cannot be reached, the page says so instead of showing an empty list.
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