Some sections require permits and others are not connected or well marked, but a researched and planned adventure is worth the extra effort.
The 285-mile route from the Idaho border to within 35 miles of Seattle crosses the Cascade Mountains in a 2.3-mile-long, unlit tunnel. This trail has something for everyone, including fun day sections and long-route challenges. Some sections require permits and others are not connected or well marked, but a researched and planned adventure is worth the extra effort. Website: parks.wa.gov/521/Palouse-to-Cascades