From east- and westbound Interstate 90, take Exit 32
From Exit 32, turn left from eastbound/right from westbound onto 436th Ave. SE and proceed 0.50 miles/0.80 km
Turn left onto SE North Bend Way and proceed 0.30 miles/0.50 km
Turn left on SE Mt. Si Road and proceed 2.90 miles/4.70 km
Turn left into parking lot, indicated by a small sign
The parking lot is gated and closed to use every evening at different times throughout the year. Be sure to note the posted closing time before your hike and return to the trailhead before the gate is closed.
A panoramic view awaits atop Mount Teneriffe, but that vista is hard earned. The trail climbs moderately to steeply throughout most of its distance. It begins gently enough, surrounded by pleasant, even if relatively young second-growth forest, but soon begins its persistent ascent. At about 4.20 miles/6.70 km from the trailhead, it reaches the ridge between q̓əlbc̓/Mount Si and Mount Teneriffe just beneath Blowdown Mountain, where it flattens briefly before resuming its climb to West Teneriffe, the next minor peak along the ridge. From there, it drops through close, gloomy new forest before rising again to the open sky of the true summit. Views sprawl in all directions: the Middle and South Fork Snoqualmie valleys directly below, the Salish Sea and Olympic Mountains to the west, Mt. Rainier to the south, and a host of other Cascade Mountains to the east and north.
At 0.90 miles/1.40 km from the trailhead, the Teneriffe Falls Trail branches right, marked by a large sign. In spring and early summer when waterfall is flowing (it reduces to a trickle after the early season snowmelt), it is a worthy, even if lengthy detour of approximately 1.90 miles/3.10 km one way from the main trail. However, the Teneriffe Falls Connector Trail between the Teneriffe Falls Trail and the Mount Teneriffe Trail saves about 0.70 miles/1.10 km on the return from the falls by connecting to the main trail farther up the mountainside. Even if you choose to skip the falls, the connector trail also provides opportunity to vary the route to the summit while adding only an additional 0.60 miles/1.00 km to the total distance. All trail junctions are well marked.
Along the main trail, signs mark junctions with the Roaring Creek Trail and Talus Loop, which offer other route options, including connections to Mount Si and even Little Si farther west. For more information on the trail network, check out the Washington Department of Natural Resources’ Mount Si NRCA Trail Map.
Although you will encounter other hikers along the trail, its round-trip distance and challenging pitch keep many at bay, especially past the cut-off to Teneriffe Falls. Adding to the relative solitude, the trail is mostly shielded from freeway noise, unlike many other trails along the Interstate 90 corridor. Despite its impressive finale, few views punctuate its lengthy woodland traverse as forest reclaims the sky from past clear-cut logging. Instead, rushing streams, calling birds, and a wide assortment of scattered wildflowers add interest to the arduous trek. Although the trail’s tread is generally smooth, there are sections of loose rock, especially where the grade is steep, and the summit block’s final ascent is a bit of a scramble. Be prepared with your traction gear of choice. At the peak, use caution when moving about, as a sheer drop plunges within steps of its eastern edge. The task attained, enjoy the soaring views and see how many natural and human landscape features you can identify in every direction.