Highest Mountain in Washington State: Mount Rainier

Mount Rainier (not "Rainer") stands at 14,410 ft (4,392 m)—the highest peak in Washington and the Cascade Range. It’s an active stratovolcano, most glaciated peak in the contiguous US (25+ glaciers), and centerpiece of Mount Rainier National Park. Visible from Seattle on clear days (~60 mi away).