Mountaineers at Mount Si

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Spaces Available: 20
Date & Time
Saturday, March 14, 2026 | 9 am-3 pm
Location
Mount Si Trail
Event Overview
Our work will include restoration and trail maintenance in the Mount Si Trail System. We will do a variety of basic trail maintenance tasks--improving the tread surface, installing and maintaining drains, and cutting back brush. We may also restore impacted areas along the trail or remove non-native plants that are growing along the trail.
Difficulty
Moderate to Strenuous
Age Restriction
Ages 14 and up.
What to Bring

For safety, volunteers are required to wear:

  • Long pants (we’ll be working with tools, so no shorts!)
  • Sturdy, close-toed shoes (absolutely no sandals)
  • Gloves

In addition, we recommend that participants bring:

  • Warm layers, especially during the fall, winter, and spring
  • Rain gear
  • Big sack lunch
  • Water for the day (3 liters minimum)
  • Small daypack for lunch, extra layers, etc.
Driving Directions

Google maps: https://goo.gl/maps/qkpU3tJWv5s

From Seattle, take I-90 Eastbound. In 29 miles, take exit 32 for 436th Ave SE. Turn left onto 436th Ave SE. At the second traffic circle, turn left onto SE N Bend Way. Turn right onto SE Mount Si Rd. In about two miles, the entrance to the Mount Si Trailhead will be on the left. Look for Greenway event signs and staff.

Discover Pass required for parking at Mount Si Trailhead

(summer only): Avoid the crowds and use Trailhead Direct to arrive to the Mailbox Peak parking lot. More details here: https://www.kingcounty.gov/~/media/elected/executive/constantine/news/graphics/2019/MailboxPeak.ashx?la=en

Additional Information

Mount Si is a favorite hiking and rock climbing destination with a strenuous 4-mile (each way) trail to the summit to sweeping views of the surrounding natural areas, cities, working farms, and forests in this picturesque part of the Greenway.  This mountain may look like an impenetrable fortress of solid rock, but it is actually quite fragile. Less than an hours drive from Seattle, Mount Si trail is one of the most hiked trails in the state. Every year thousands of hikers scramble to the top and the impact takes its toll on vegetation and wildlife habitat.  Join the work on Mount Si that the Greenway has been a part of for over a decade by volunteering to improve trail drainage, reduce erosion, cut back overgrown brush, and harden the trail surface. 

[47.488121, -121.723197]
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