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

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.

  • 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.
  • Suitable Activities: Day Hiking
  • Seasons: May, June, July, August, September, October, November
  • Weather: View weather forecast.
  • Difficulty: Very Strenuous
  • Length: 11.2 mi
  • Elevation Gain: 4,100 ft
  • 4,926 ft
Map
  • Green Trails Bandera No. 206
  • Green Trails Mount Si NRCA No. 206S
Activities

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