Mount Si Hike

Seattle + Tacoma Metro Area, Washington

Start Exploring
Mount Si Hike


  • The trail to Mount Si has some steep and rocky sections.- Mount Si Hike
  • The well-maintained trail starts steep, and steps test your calves as you climb a 900-foot elevation gain over the first mile.- Mount Si Hike
  • Douglas fir trees compete for sunlight along the trail.- Mount Si Hike
  • A wayside on the trail to Mount Si.- Mount Si Hike
  • The early part of the hike is shaded, and sunlight filters through the high limbs.- Mount Si Hike
  • Small vistas reveal themselves as you continue to climb the trail.- Mount Si Hike
  • Near Haystack Basin, the trail becomes rockier and less shaded.- Mount Si Hike
  • - Mount Si Hike
  • View of the Snoqualmie Basin.- Mount Si Hike
  • Mount Rainier (14,411') is visible on clear days.- Mount Si Hike
  • The veiw from Mount Si.- Mount Si Hike
  • You can find various rock columns and tables to sit and enjoy the views or a lunch.- Mount Si Hike
  • A view to the summit of Mount Si (4,167') from Haystack Basin.- Mount Si Hike
  • - Mount Si Hike
  • Depending on the crowds, you may find yourself scrambling over rocks at the basin looking for your own space.- Mount Si Hike
  • The trail continues around the back of Haystack for those that wish to attempt the summit.- Mount Si Hike
  • Mount Si.- Mount Si Hike
  • - Mount Si Hike
  • Spectacular summit views make the trek worthwhile.- Mount Si Hike
  • A playful rock formation at Haystack Basin.- Mount Si Hike
  • A view of Mount Baker (10,781') from Mount Si.- Mount Si Hike
  • The upper viewpoint.- Mount Si Hike
  • Mount Rainier (14,411').- Mount Si Hike
  • The view toward Seattle and Bellevue.- Mount Si Hike
Overview + Weather
Close to Seattle. Beautiful views. Accessible year-round.
Usually crowded. Summit is not for everyone.
Seattle + Tacoma Metro Area, WA
Pets allowed: 
Net Elevation Gain: 
3,467.00 ft (1,056.74 m)
Parking Pass: 
Washington Discovery Pass
Preferable Season(s):
Spring, Summer, Fall
Total Distance: 
8.00 mi (12.87 km)
Trail type: 
Trailhead Elevation: 
700.00 ft (213.36 m)
Typically multi-day: 
Current Local Weather:
Hike Description

Hike Description


Mount Si is one of best and most popular hikes near Seattle. The mountain, originally referred to by Native Americans as 'Kelbts,' borrows its current name from a mid-1800s farmer, Josiah 'Uncle Si' Merrit. Due to the close proximity to the city, the trail is often busy with hikers, climbers, and miscellaneous adventurers. Incredibly, this trail sees approximately 80,000-100,000 users per year.

The trailhead's elevation sits at approximately 700 feet, and from here you zigzag through a tall Douglas fir forest with sunlight filtering through the limbs on the well-maintained trail. Don't let the quality of trail fool you, though; it gains over 900 feet of elevation in the first mile. This is a great test for those starting out on Mount Si!

After approximately 2 miles there is a short reprieve at Snag Flats, which is a brief, flat section of trail with a boardwalk and signage that describes the history of the mountain, the trail, and the surrounding area. Be sure to rest your legs here if you need to, as the trail is relentless from here.

Continue about 1,800 feet up the trail from Snag Flats to Haystack Basin, and by now you have reached an elevation of 3,900 feet. This is the end of the trail for most hikers, and it offers outstanding views of the Upper Snoqualmie Valley, the Puget Sound Basin, and the Olympics. There are plenty of areas to rest and eat the lunch you've packed with you, and you'll get great views of the 4,167-foot summit known as The Haystack that hovers about 300 feet above you.

Most will view the summit and return to the trailhead. For the adventurous few who wish to continue to the summit, use caution.  Falls on the Class III scramble to the summit are often exposed and can result in serious injury or death. The rock here has been climbed often enough that most of the loose rock has been dismantled. 

The there-and-back trip to Haystack Basin on the Mount Si Trail is 8 miles (8.5 for those who summit the Haystack), and it takes about 4.5 to 6.5 hours on average.

Updates, Tips + Comments

Updates, Tips + Comments

Field Guide + Trail Map

Field Guide + Trail Map

Location + Directions

Location + Directions

Nearby Camping + Lodging

(9 within a 30 mile radius)

Nearby Adventures

(140 within a 30 mile radius)

Related Content

Related Content

Adventure Community

Adventure Community

Who Wants To Do It
88 Members
Who's Done It
127 Members
Submission by
131 Adventures Explored
47 Adventures Published

Newsletter Signup

Join the Outdoor Project Community

Get access to essential planning materials and information for your next adventure. Take a few seconds to join the community. It’s FREE!

Free Field Guides + Maps

Post Updates, Tips + Comments

Organize + Track Your Adventures

Insider Detailed Info, News + Benefits

Custom Driving Directions

Recommended Campsites, Photos + Reservation Info