Mount Si, Blowdown and Teneriffe Loop

This loop is considered difficult due to its length of nearly 19 kilometers and significant elevation gain of over 1500 meters. Sections like the Kamikaze trail on the Teneriffe ascent are particularly strenuous. It's best suited for experienced hikers looking for a full-day adventure.

Hikers should plan for a full day on the trail. The estimated duration for this loop is around 9 to 10 hours, but this can vary significantly based on fitness levels, weather conditions, and time spent enjoying the views.

The loop offers diverse terrain, starting with dense forest along the Roaring Creek Trail. As you ascend towards Mount Teneriffe, expect steeper sections with switchbacks and rocky paths. The Blowdown Mountain traverse can be more rugged with fallen trees, while the descent from Mount Si is generally well-maintained. You'll experience lush forests, areas with wildflowers, and rugged mountain environments.

The loop features several notable highlights. You'll encounter the Mount Si Viewpoint, the Base of Haystack Scramble, and the Mount Si Peak. Additionally, you'll reach the summit of Mount Teneriffe, which offers panoramic views of the Cascade Range and Snoqualmie Valley. Don't miss Teneriffe Falls along the way.

The loop typically starts from the Mount Si Trailhead near North Bend, Washington. Parking is available at the trailhead, but it can fill up quickly, especially on weekends. Arriving early is highly recommended to secure a spot.

Yes, a Discover Pass is required for parking at the Mount Si Trailhead, as it is located within the Mount Si Natural Resources Conservation Area. You can purchase a day pass or an annual pass online or at various vendors.

Yes, dogs are generally allowed on this trail. However, they must be kept on a leash at all times. Please remember to pack out all pet waste to help preserve the natural environment.

The best time to hike this loop is typically from late spring through early fall (May to October) when the weather is milder and snow has melted from higher elevations. Wildflowers are abundant in spring and early summer. Always check current trail conditions before heading out.

Winter hiking on this loop can be very challenging. Higher elevations and ridge walks can become slick with snow and ice, potentially requiring specialized gear like microspikes or ice axes. Some sections may also be less traveled and harder to navigate. It's recommended only for experienced winter hikers with proper equipment and preparation.

Yes, this route incorporates sections of several official trails. You will hike along parts of the Mount Si Old Trail, Mount Teneriffe Trail, Mount Si Trail, and Blowdown Mountain Trail, offering a comprehensive experience of the area's trail network.

Many hikers prefer to tackle the steeper ascent to Mount Teneriffe first, getting the most challenging climb out of the way early. The Blowdown Mountain section is generally less traveled, offering a more secluded experience before joining the more popular Mount Si descent. Starting early is crucial to avoid crowds and ensure enough daylight.