With an estimated 80,000 to 100,000 visitors each year, Mount Si is arguably the most heavily climbed trail in the entire state of Washington. Mount Si is used by a wide variety of people- hikers, climbers, trad climbers, trail runners, people training to climb Rainier, and even mixed climbers in winter. It is not uncommon to see paragliders who have used Mount Si as a launching pad, either.
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