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Seattle, WA: Mount Si

A locals’ favorite, this challenging dayhike up Mount Si is less than an hour from Seattle and features eagle-eye views of the Snoqualmie River valley and Mount Rainier.

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There’s good reason why this 7.6-mile hike to the summit of Mount Si is popular year-round. Less than an hour from downtown Seattle, this summit climb in the Cascade Range offers hikers a challenging workout (3,400 feet of elevation in 3.8 miles) and 5-star views at the top.
From the trailhead head north on the well-traveled trail. There’s little time for a warm-up; the climbing begins just 0.2 mile into the route. The next one and a half miles climb steeply up the mountain, passing a Stairmaster-like stretch and several benches. At mile 1.7, the route reaches Snag Flats, which offers a brief respite from the climbing. Walk along the interpretive boardwalk—a series of illustrated signs detail the natural history of the area. Prepare for another onslaught of switchbacks after milepost 2.
After 3.6 miles, the trail enters a meadow below Haystack Rock, a towering rock outcrop—and Mount Si’s true summit. Stop here to admire views of the Snoqualmie River valley and surrounding peaks before turning around and heading back to the trailhead. Experienced hikers can continue north for the challenging scramble to the top of Haystack Rock.
-Mapped by David Tate

To Trailhead

Take I-90 E to exit 32. Turn left at 436th Ave. SE. In 0.5 mile, left onto SE Cedar Falls Way. In 0.3 mile, right onto 432nd Ave. SE/Stilson Ave. SE. In 0.1 mile, right at SE Mt. Si Rd. In 2.4 miles, left onto 461st Ave. SE. Go 450 feet to Mount Si Natural Resources Conservation Area parking lot.

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