Stevens Pass Scenic Byway is a 85 mile trail located near Skykomish, WA. The trail is primarily used for scenic driving and is accessible year-round.
I still remember the rugged beauty. If you have time, from the pass, hike the Pacific Crest Trail north to Lake Valhalla which is about a 12 mile round trip. Actually, Lake Valhalla is above tree line and very anti-climatic. There is a beautiful hanging valley about 4 miles up that you will never forget.
This is a beautiful drive through pristine mountains. There are several great hiking trails just off the route.