| Trail Highlights: | Mountain and valley views; autumn foliage |
| Round-trip Distance: | ≅ 4.70 miles / 7.60 km |
| Required Pass: | Discover Pass or equivalent for state recreation sites |
| Location: | Mount Si Natural Resources Conservation Area, Snoqualmie Pass / Snoqualmie Valley, Washington Central Cascades Ancestral lands of the Snoqualmie |
| Directions: | |
| Additional Trail Info: | Washington Trails Association (Little Si) Washington Trails Association (Boulder Garden Loop) Washington State Department of Natural Resources |
Little Si’s summit surveys the Snoqualmie Valley sprawling below. Little Si Trail, April 10, 2016.
Little Si’s junior designation and small size in comparison to its larger counterpart, Mount Si, or “Big Si,” do not diminish its distinction as a hardy half-day hike in its own right. The two are informally known as “Resolution Peaks,” given their popularity for physical fitness training, particularly around the New Year. Little Si’s trail alternates between moderate to very steep along its relatively short distance. At lower elevation, verdant deciduous forest encloses the trail in the spring and summer months, transitioning to dense evergreen woodland as it climbs. Unusual rock formations characterize the trail, with boulders strewn throughout the wayside, cliffs soaring to the treetops, and craggy ledges crowning the summit.
The trail’s less-travelled Boulder Garden Loop departs the main trail just 0.30 miles/0.50 km from the trailhead and climbs approximately 1.50 miles/2.40 km up and over a steep ridge before rejoining the main trail a mere 0.20 miles/0.30 km from where it diverged. Along the way, the quiet loop trail meanders through the knobby, sometimes house-sized rock formations that are its namesake, towering conifer columns, and a weft of delicate vine maples that, in autumn, light the wayside wood with gold. The Boulder Garden Loop also provides alternate access to the Mount Si trail. The Douglas Fir Trail departs the loop trail approximately 0.25 miles/0.40 km from loop’s lower junction with Little Si Trail and joins the main Mount Si trail approximately 1.00 mile/1.60 km from the Mount Si trailhead. The very steep Old Si Trail branches from the loop trail about 0.50 miles/0.80 km from the loop trail’s upper junction with the Little Si Trail and connects to the main Mount Si trail approximately 1.00 mile/1.60 km from Mount Si‘s summit and again just below the summit. The Old Si Trail is currently not marked, but is easily seen at a sign that clarifies which fork to take to remain on the Boulder Garden Loop. Simply take the other fork to access the Old Si Trail.
Whichever path you choose, be prepared with the appropriate traction gear for your comfort. The trail’s popularity has reduced it to bare rocks and roots in several sections and, on its northern end, the Boulder Garden Loop is quite narrow and rocky. And do come expecting to share this well-trodden trail with others, especially on weekends. Finally, exercise great care along the cliff’s edges at the summit, as falls could end unfortunately.
The trail’s lower section is especially lovely after spring has clothed the surrounding woodland in delicate verdure. Little Si Trail, July 04, 2016.
While the entire Little Si Trail is noted for its rocky wayside, the Boulder Garden Loop is especially characterized by distinctive stony outcrops. Boulder Garden Loop, Little Si Trail, July 04, 2016.
In several stretches, the trail is worn to the roots of its foundations, which can be the more treacherous when slickened by the Pacific Northwest’s frequent rain. Little Si Trail, October 23, 2022.
Although Little Si’s shadowy woodland is not known for its wildflowers, many still brighten the trailside throughout the seasons, including Pacific trilliums (Trillium ovatum) (top row, left), red-flowering currants (Ribes sanguineum) (top row, left center), ocean-spray (Holodiscus discolor) (top row, right center), cut-leaved foamflowers (Tiarella trifoliata) (right), oso berries (Oemleria cerasiformis) (middle row, left), salmonberries (Rubus spectabilis) (middle row, left center), Pacific bleeding hearts (Dicentra formosa) (middle row, right center), round-leaved violets (Viola orbiculata) (lower row, left), ghost pipes (Monotropa uniflora) (lower row, left center), and Cascade Oregon-grapes (Berberis nervosa a.k.a. Mahonia nervosa) (lower row, right center).
Little Si Trail and Boulder Garden Loop, March, April, and July 2016 and 2019.
Again in autumn, the leafy lowland forest puts on a show. Little Si Trail, October 23, 2022.
As both the main trail and loop trail climb, they enter evergreen forest. Along the Boulder Garden Loop, the forest canopy is high enough to permit a lush middlestory of lacy vine maples (Acer circinatum) to meander throughout the woodland columns. Boulder Garden Loop, Little Si Trail, July 04, 2016.
Watch and listen for climbers on massive cliffs jutting abruptly from the dim forest approximately 1.00 mile/1.60 km from the trailhead. Little Si Trail, April 21, 2019.
Keep a keen eye out for the various curiously formed fungi that aid in decomposing the fallen leaves, logs, and other forest litter along the trail. Boulder Garden Loop, Little Si Trail, and Old Mount Si Trail,
April, July, and October 2016 and April and July 2019.
Vantage points at the summit offer varying views. The first, seen here, affords a westward keyhole glimpse of the Snoqualmie Valley between Little Si and its neighboring counterpart, Mount Si, also known as “Big Si.” Little Si Trail, April 03, 2016.
Enjoy the bird’s-eye views, but exercise caution on the summit’s lookout ledges, where falls have proven deadly. Little Si Trail, April 03, 2016.
To the east, the view from Little Si’s summit stretches up the Snoqualmie Valley to the Cascade Mountains on the horizon beyond, including, from left to right, Mailbox Peak, Mount Washington, and Rattlesnake Mountain. Little Si Trail, April 10, 2016.
