Mailbox Peak

A strenuous day hike with 4,100 feet of elevation gain. The original path heads straight up the ridge through the forest to the rocky summit for a 6-miles round trip. The new trail switchbacks to the summit for 11.2 miles round trip.

getting there

Take Exit 34 off of I-90 and drive north on 468th Ave SE for ~0.5 mile. Turn right onto SE Middle Fork Road, continue for 2.5 miles, turn right and drive ~200 yards to the Mailbox Peak trailhead (900 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

trail

11.2 miles round trip with 4,100 feet of elevation gain

In response to a continued increase in usage, the Mountains to Sound Greenway and the Washington State Department of Natural Resources opened a new, more sustainable trail up Mailbox Peak in the Middle Fork Snoqualmie River Valley in 2014. This new 5-mile trail has offered increased access to this already popular area. Volunteers play a crucial role in keeping this already well-loved trail maintained.

boothpath

6 miles round trip with 4,100 feet of elevation gain

The original route up Mailbox Peak heads straight up the ridge through the forest to the rocky summit.

dirtybox peak (4,926 ft)

8.5 miles with 4,570 feet of elevation gain

Dirtybox Peak lies on the ridge between Mailbox Peak and Dirty Harry's Peak.  Follow the old Mailbox Peak path to the summit of Mailbox Peak, then continue down and across the Southeast Ridge to Dirtybox Peak.  

  • Difficulty: Very Strenuous, Snow Scramble, Winter Scramble
  • Length: 11.2 mi
  • Elevation Gain: 4,100 ft
  • 4,841 ft
Map
  • Green Trails Mount Si NRCA No. 206S
  • Green Trails Middle Fork Snoqualmie No. 174S
  • Green Trails Bandera No. 206
Activities

Upcoming Activities



Winter Scramble - Mailbox Peak

Day Hiking Trip
Timed hike for SSCG (Shih/Schiller/Cokus/Girard) Int Alpine Climbing Package Group only.
Difficulty: Very Strenuous, Snow Scramble, Winter Scramble
Sat, Feb 23, 2019
Prerequisites, Leader's Permission Required
1 participant 2 leaders
Registration closes Feb 21
Seattle Branch

Seattle SIG Practices and Conditioners - Mailbox Peak

Climbing Field trip: Basic Alpine Climbing Course
SIG activities, for Lalonde SIG.
Difficulty: Very Strenuous, Snow Scramble, Winter Scramble
Sat, Mar 2, 2019
No Prerequisites
11 participants
Registration closes Feb 28
Seattle Branch

Seattle SIG Practices and Conditioners - Mailbox Peak

Climbing Field trip: Basic Alpine Climbing Course
SIG activities, including skill practices conditioning trips
Difficulty: Very Strenuous, Snow Scramble, Winter Scramble
Mon, Apr 15, 2019
No Prerequisites, Leader's Permission Required
11 participants
Registration closes Apr 13
Seattle Branch

Seattle SIG Practices and Conditioners - Mailbox Peak

Climbing Field trip: Basic Alpine Climbing Course
SIG activities, including skill practices conditioning trips
Difficulty: Very Strenuous, Snow Scramble, Winter Scramble
Tue, May 7, 2019
No Prerequisites, Leader's Permission Required
10 participants 1 instructor
Registration closes May 5
Seattle Branch
Trip Reports
Resources

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