Trip
Day Hike - Mount Si Main Trail
Enjoy an old-growth, delicate forest while ascending 3,150 feet in 4 miles at a moderate pace. Be rewarded at the summit with the stunning views of Snoqualmie Valley and Mount Rainier on a clear day. Join me on this 8-miles hike.
Contacts
- Sat, Apr 18, 2026
- Tacoma Hiking & Backpacking Committee
- Day Hiking
- Adults, All Who Qualify
- Moderate/Strenuous
- Moderate
- Mileage: 8.0 mi
- Elevation Gain: 3,150 ft
- High Point Elevation: 3,800 ft
- Pace: 1.8-2.2
- 3 (7 capacity)
- Fri, Mar 27, 2026 at 9:22 PM
- Thu, Apr 16, 2026 at 5:00 PM
- Cancellation & Refund Policy
- iCal Google
After a brief introduction, we will hit the trail at 8:45am and stay together as a group. Switchbacks and climbing begin almost as soon as we leave the trailhead. The trail ascends steadily, but gently, for its first mile and a half. Shortly thereafter, it flattens out as it winds through Snag Flat, a stand of old-growth trees that have survived both fire and logging. We will take a short break to appreciate the immense size and age of these trees. Beyond Snag Flat, the trail steepens, climbing more aggressively through younger forest. We will continue to the base of Mount Si Haystack, our turnaround spot.
We will take a few 5 min-breaks when needed for layers adjustment, hydration, snacks, party separation, or taking pictures. We will have a 20-min break at the base of Mount Si Haystack. Expect to be on the trail for 4.5-5.0 hours.
We will hike rain or shine, unless the weather is unfavorable.
Sunrise 6:12am, Sunset 8:00pm.
WTA hiking guide: Mount Si — Washington Trails Association
More details will be provided after registration closes.
Mount Si Trailhead Parking Lot at 8:30am. Discover Pass required.
Mount Si Main Trail
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Green Trails Mount Si NRCA No. 206S
Green Trails Mt Si No. 174
USGS Mt Si - See full route/place details.
Required Equipment
- Navigation
- Headlamp
- Sun protection
- First aid
- Knife
- Fire
- Shelter
- Extra food
- Extra water
- Extra clothes