Mount Si Old Trail

A strenuous, 7 mile hike with 3,300 ft in elevation gain. The trail features part of the Boulder Garden Loop, a steep old trail for a good workout and views of the Upper Snoqualmie Valley and Puget Sound. At the top consider an excursion to Blowdown Mountain, Crater Lake Mountain, or Dixie Peak.

getting there

Take Exit 32 off of I-90 near North Bend. Turn left, crossing over I-90, and follow 468th Ave NE to SE North Bend Way and turn left.  Turn right onto SE Mount Si Road and then left into the Litte Si/Exit 32 Parking Lot (500 ft) shortly after crossing the bridge across the Middle Fork Snoqualmie River.

on the trail

Mount si (3,900 ft)

7 miles round trip hike, 3,300 feet of elevation gain, Difficulty: Moderate/strenuous

Hike the Little Si Trail and take either the southern or northern leg of the Boulder Garden Loop Trail to the "old connector trail." Continue to the intersection with the Mount Si "Main" Trail, turn right and continue to the top.

Note: The "haystack" jutting out of the meadow is the true summit and is a challenging and exposed scramble route. It is not appropriate for day hikers.

scramble routes

Mount Si HaySTACK (4,180 FT)


From the meadow at the top of Mount Si continue northeast on the path to a wooden bench that marks the start of the Haystack scramble route. The path continues north to a rocky northeast-facing gully. Holds are plentiful and the rock is generally sound. There are many paths up the gully until you reach the saddle between the main and north summits. From here, turn south (climber's left) and make a few slabby exposed moves to reach the summit.

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.



  • Permits are required in this area for all fee-based (course-related) activities, regardless of group size.  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 with any additional questions. More details about permitting on WA DNR land as it applies to Mountaineers trips, as well as our current year Land Use License, can be found on our Washington State Department of Natural Resources (DNR) page.
  • Scrambles of Mount Si Haystack, Blowdown Mountain, Crater Lake Mountain, and Dixie Peak may also be scrambled from the Mountain Si "main" Trail. Please be sure to review activities on the Mount Si Main Trail route/place and contact the leader(s) of existing trips to the same destination to ensure there are no concerns or conflicts, according to The Mountaineers Outdoor Ethics Policy. Please review our Group Size & Multiple Bookings page for guidance.
  • Difficulty: Strenuous
  • Length: 7.0 mi
  • Elevation Gain: 3,300 ft
  • 3,841 ft
  • Land Manager: Mount Si NRCA
  • Parking Permit Required: Discover Pass
  • Recommended Party Size: 12
  • Maximum Party Size: 12
  • Maximum Route/Place Capacity: 12
  • Green Trails Mount Si NRCA No. 206S

Upcoming Activities

Day Hike - Mount Si Old Trail

Day Hiking Trip
An early morning conditioner. We will do Old up and New down.
Difficulty: Strenuous
Fri, Sep 29, 2023
No Prerequisites
2 participants 0 leaders
Registration closes Sep 28
Foothills Branch
Yu-chin Chen

TAC MAC Conditioner Hike - Mount Si Old Trail

Youth Youth activity: Mountaineers Adventure Club - Tacoma
Monthly conditioner hikes to get us in shape!
Difficulty: Strenuous
Wed, Feb 21, 2024
No Prerequisites
10 participants 1 instructor
Registration closes Feb 19
Tacoma Branch
Sarah Holt
Qualified Youth Leader
Trip Reports

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 and Teneriffe Traverse
  • Mount Si Haystack
  • Blowdown Mountain
  • Crater Lake Mountain
  • Crater Lake & Blowdown Mountains
  • Dixie Peak
  • Roaring Creek

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


Jeffrey Hunt
Jeffrey Hunt says:
Dec 07, 2016 10:59 AM

Jeff's Mentor Group Conditioner Hike to assess fitness. By next spring the goal is Old Si trail in 90min with 20%BW.

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