Washington is the epicenter of mountaineering in the lower 48 US states with more technical and glacier ascents than anywhere else outside of Alaska.
The rugged, volcanic Cascade Range runs north-south across the state with hundreds of major peaks including Mt. Rainier (Washington's highest peak and the only US 14er outside of Colorado, California, and Alaska), Mt. Adams, Mt. Baker, Mt. Shuksan, Glacier Peak, and Mt. St. Helens of 1980 eruption fame. The Pacific Crest Trail passes 500 miles along the length of the range across Washington on its way to the Canadian border
The Olympic Mountains in the Olympic Peninsula of western Washington only rise up shy of 8,000 ft but look much higher because they lie only 12 to 22 miles from the Pacific Ocean. The western slope of the range is the wettest place in the US.
Washington has 3 mountain-centric National Parks: Mount Rainier National Park, Olympic National Park, and North Cascades National Park. All 3 lie within a couple hours drive of the Seattle metro area.
Get away from the crowds and head to the North Cascades, a particularly rugged and vertical part of the Cascades with a multitude of incredible peaks to climb.
Over 4 million acres of mountainous wilderness areas protect vast trail networks leading to a lifetime of peaks to climb. An incredible place to explore.