Mount Si Main Trail

A moderate/strenuous 8-mile round trip day hike with 3,200 feet of elevation gain. This is a popular trail in the foothills that offers a good workout and views of Puget Sound and the Upper Snoqualmie Valley.

Getting there

Take Exit 32 off of I-90 and turn left (north) onto 436th Ave SE. Drive 0.5 mile  and turn left (west) onto North Bend Way nd in 0.25 mile, turn right (north) onto Mount Si Road. Continue 2.5 miles and turn left into the large trailhead parking lot (600 ft).

PUBLIC TRANSPORTATION - TRAILHEAD DIRECT

On weekends and designated holidays, Trailhead Direct takes riders to three hiking destinations: Mount Si, Issaquah Alps, and Mailbox Peak. All buses are run by King County and regular fares apply, just like in the city. By establishing this service, Trailhead Direct aims to increase accessibility to local trails, limit vehicle congestion in trailhead parking lots, and reduce carbon emissions. If you will have a group of more than 10 people, please fill out this form to reserve seating.

on the trail

Mount Si (3,900 ft)

A moderately strenuous 8-mile round trip hike with 3,159 feet of elevation gain

The Mount Si "main" Trail begins at the far corner of the parking lot where just past the picnic area and outhouse. The trail is moderate for the first two miles and then steepens with more switchbacks until it ends in the meadow at the top.

The "haystack" jutting out of the meadow is the true summit and it can be scrambled. The route is challenging and exposed, and it' easy to send rock fall to unsuspecting hikers below, so this is not recommended.

The Talus Loop Trail makes an excursion off the main Mount Si Trail, reconnecting at Snag Flats.  It's 1.3 mi instead of the 1.0 mi if you were to stay on the Mount Si Main Trail.

"Si, Si Again" or "Double Si" Conditioner: Hike up the Mount Si Main Trail to the viewpoint near the summit, down the main trail, lunch in the parking lot, then a car shuttle to the Little Si Trail parking lot, up the Boulder Gardens/Old Si Trail to the viewpoint, down the  trail, car shuttle back to Little Si. Great for conditioning!  It's 16 miles and 6,400 feet of elevation gain.

scramble routes

blowdown mountain (4,560 ft) and crater lake mountain (4,351 ft)

a 12-mile round trip scramble with 4,400 feet of elevation gain, difficulty: strenuous 4, technical 2

From top of Mount Si continue on the path and road to where that road terminates northwest of Mount Teneriffe. Ascend past 4,440 ft, then follow the ridge northwest, descend west to a saddle, and then ascend continuing west to the summit of Blowdown Mountain. The views are not great, but in winter, this is all that daylight may allow. From Blowdown Mountain, travel north, descending to a saddle and then ascending to Crater Lake Mountain.

Dixie Peak (4,606 ft)

a scramble with 4,400 feet of elevation gain, difficulty: strenuous 4, technical 4

From top of Mount Si continue on the path and road to where that road terminates northwest of Mount Teneriffe. Ascend past 4,440 ft, then follow the ridge northwest and then north to Dixie Peak.

INFORMATION FOR LEADERS

  • Permits are required in this area for all fee-based (course-related) activities, regardless of group size, and all free activities involving 13 or more people. Leaders may list trips at this route/place with the understanding that they need to verify that a permit has been obtained before running the trip (if required as outlined above). Permit applications are submitted to WA Department of Natural Resources annually in December. Please contact Amanda Virbitsky at amandav@mountaineers.org with any additional questions.
  • Difficulty: Moderate/Strenuous
  • Length: 8.0 mi
  • Elevation Gain: 3,150 ft
  • 3,900 ft
  • Land Manager: Mount Si NRCA
  • Parking Permit Required: Discover Pass
  • Recommended Party Size: 12
  • Maximum Party Size: 65
  • Maximum Route/Place Capacity: 65
Map
  • Green Trails Mount Si NRCA No. 206S
  • Green Trails Mt Si No. 174
  • USGS Mt Si
Activities

Upcoming Activities



Seattle SIG Practices and Conditioners - Mount Si Main Trail

Climbing Field trip: Basic Alpine Climbing Course
Conditioning Hike for Angulo/Metz SIG
Difficulty: Moderate/Strenuous
Sat, Jan 25, 2020
No Prerequisites
4 participants 0 instructors
Registration closed Jan 23
Seattle Branch

Intermediate Course Qualifier Conditioner - Mount Si Main Trail

Climbing Field trip: Intermediate Alpine Climbing Program
This conditioning qualifier ensures that you have the basic level of physical fitness required to
Difficulty: Moderate/Strenuous
Sun, Jan 26, 2020
Prerequisites
9 participants 0 instructors
Registration closes Jan 24
Tacoma Branch

Basic Climbing - Mt Si Conditioner Field Trip - Mount Si Main Trail

Climbing Field trip: Basic Climbing Course
Basic Climbing - Mt Si Conditioner FT
Difficulty: Moderate/Strenuous
Sat, Feb 1, 2020
Prerequisites
28 participants 3 instructors on waitlist
Registration closes Jan 30
Everett Branch

Seattle SIG Practices and Conditioners - Mount Si Main Trail

Day Hiking Field trip: Basic Alpine Climbing Course
SIG Skills Conditioner - Training for Successful Approaches
Difficulty: Moderate/Strenuous
Wed, Feb 12, 2020
No Prerequisites, Leader's Permission Required
8 participants 0 instructors
Registration closes Feb 10
Seattle Branch

Conditioning Hikes - Mount Si Main Trail

Day Hiking Field trip: Alpine Scrambling Course
Seattle Alpine Scramble Course Conditioning Hike
Difficulty: Moderate/Strenuous
Sun, Feb 16, 2020
No Prerequisites
10 participants 1 instructor on waitlist
Registration opens Feb 4; Instructor registration open now
Seattle Branch

Conditioning Hikes - Mount Si Main Trail

Day Hiking Field trip: Alpine Scrambling Course
Seattle Alpine Scramble Course Conditioning Hike -- daytime hike!
Difficulty: Moderate/Strenuous
Tue, Feb 18, 2020
No Prerequisites
6 participants 1 instructor
Registration opens Feb 4; Instructor registration open now
Seattle Branch

Conditioning Hikes - Mount Si Main Trail

Day Hiking Field trip: Alpine Scrambling Course
Scramble conditioning hike
Difficulty: Moderate/Strenuous
Wed, Feb 26, 2020
No Prerequisites
8 participants 1 instructor
Registration opens Feb 4; Instructor registration open now
Seattle Branch

Day Hike - Mount Si Main Trail

Day Hiking Trip
Everett Basic Climbing Course Conditioner. This activity will only be open to EBCC students and
Difficulty: Moderate/Strenuous
Sun, Mar 1, 2020
No Prerequisites, Leader's Permission Required
8 participants 1 leader
Registration opens Feb 2
Everett Branch

Conditioning Hikes - Mount Si Main Trail

Day Hiking Field trip: Alpine Scrambling Course
Scramble conditioning hike
Difficulty: Moderate/Strenuous
Wed, Mar 4, 2020
No Prerequisites
8 participants 0 instructors
Registration opens Feb 4; Instructor registration open now
Seattle Branch

Seattle SIG Practices and Conditioners - Mount Si Main Trail

Climbing Field trip: Basic Alpine Climbing Course
SIG activities, including skill practices conditioning trips
Difficulty: Moderate/Strenuous
Sat, Mar 7, 2020
No Prerequisites
4 participants
Registration closes Mar 5
Seattle Branch

Day Hike - Mount Si Main Trail

Day Hiking Trip
Difficulty: Moderate/Strenuous
Sun, Mar 8, 2020
No Prerequisites, Leader's Permission Required
11 participants
Registration opens Feb 25
Tacoma Branch

Conditioning Hikes - Mount Si Main Trail

Day Hiking Field trip: Alpine Scrambling Course
Scramble conditioning hike
Difficulty: Moderate/Strenuous
Wed, Mar 11, 2020
No Prerequisites
8 participants 1 instructor
Registration opens Mar 2; Instructor registration open now
Seattle Branch

Seattle SIG Practices and Conditioners - Mount Si Main Trail

Climbing Field trip: Basic Alpine Climbing Course
This will be an opportunity enjoy a nice sunset from the top of Mt Si.
Difficulty: Moderate/Strenuous
Thu, Mar 12, 2020
No Prerequisites
7 participants 0 instructors
Registration closes Mar 10
Seattle Branch

Day Hike - Mount Si Main Trail

Day Hiking Trip
Conditioner hike for Tacoma Basic Climbing students
Difficulty: Moderate/Strenuous
Sun, Mar 15, 2020
No Prerequisites, Leader's Permission Required
6 participants 1 leader
Registration closes Mar 13
Tacoma Branch

Conditioning Hikes - Mount Si Main Trail

Day Hiking Field trip: Alpine Scrambling Course
Seattle Alpine Course Conditioner -- after work hours.
Difficulty: Moderate/Strenuous
Wed, Mar 18, 2020
No Prerequisites
8 participants 1 instructor
Registration opens Feb 4; Instructor registration open now
Seattle Branch

Conditioning Hikes - Mount Si Main Trail

Day Hiking Field trip: Alpine Scrambling Course
Seattle Alpine Course Conditioning Hike
Difficulty: Moderate/Strenuous
Wed, Mar 25, 2020
No Prerequisites
8 participants 1 instructor on waitlist
Registration opens Feb 4; Instructor registration open now
Seattle Branch

Seattle SIG Practices and Conditioners - Mount Si Main Trail

Climbing Field trip: Basic Alpine Climbing Course
SIG activities, including skill practices conditioning trips
Difficulty: Moderate/Strenuous
Thu, Apr 2, 2020
No Prerequisites
3 participants 2 instructors
Registration closes Mar 31
Seattle Branch

Conditioning Hikes - Mount Si Main Trail

Day Hiking Field trip: Alpine Scrambling Course
Seattle Alpine Scramble Course Conditioning Hike
Difficulty: Moderate/Strenuous
Fri, Apr 3, 2020
No Prerequisites
10 participants 1 instructor on waitlist
Registration opens Feb 4; Instructor registration open now
Seattle Branch

Conditioning Hike - Mount Si Main Trail

Day Hiking Field trip: Compressed Alpine Scrambling Course
A scramble conditioning hike for students
Difficulty: Moderate/Strenuous
Sat, Apr 11, 2020
No Prerequisites
10 participants 0 instructors
Registration opens Mar 16; Instructor registration open now
Foothills Branch

Conditioner Hikes - Mount Si Main Trail

Day Hiking Field trip: Intensive Basic Alpine Climbing Course
Conditioner for Intensive Basic 2020 and summer climbs. Students must complete this activity in under
Difficulty: Moderate/Strenuous
Sun, Apr 12, 2020
No Prerequisites
6 participants
Registration opens Apr 15
Seattle Branch

Seattle SIG Practices and Conditioners - Mount Si Main Trail

Climbing Field trip: Basic Alpine Climbing Course
SIG activities, including skill practices conditioning trips
Difficulty: Moderate/Strenuous
Wed, Apr 22, 2020
No Prerequisites
3 participants
Registration closes Apr 20
Seattle Branch

Conditioner Hikes - Mount Si Main Trail

Day Hiking Field trip: Intensive Basic Alpine Climbing Course
The "gold standard" in conditioning hikes.
Difficulty: Moderate/Strenuous
Wed, Jun 3, 2020
No Prerequisites
11 participants
Registration closes Jun 1
Seattle Branch
Trip Reports
Titles

This is a list of titles that represent the variations of trips you can take at this route/place. This includes side trips, extensions and peak combinations. Not seeing a title that fits your trip? Log in and send us updates, images, or resources.

  • Mount Si via Talus Loop
  • Talus Loop
  • Si, Si Again
  • Double Si
  • Blowdown Mountain
  • Crater Lake Mountain
  • Crater Lake & Blowdown Mountains
  • Dixie Peak
Resources

There are no resources for this route/place. Log in and send us updates, images, or resources.

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