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Mt. Si

Intermediate/Difficult
 4.4 (117) RECOMMENDED ROUTE

A steep, well-maintained trail takes you atop Mt. Si with outrageous views of Puget Sound.


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Map Key

6.6

Miles

10.7

KM

Out and Back

3,999' 1,219 m

High

717' 219 m

Low

3,281' 1,000 m

Up

3,282' 1,000 m

Down

19%

Avg Grade (11°)

41%

Max Grade (22°)

Dogs Leashed

Features Birding · Fall Colors · River/Creek · Views · Wildlife

Discovery Pass required year round.

Overview

This is a classic, well-traveled hike leading to the top of Mt. Si. There is a small portion of scrambling at the summit that is optional.

Need to Know

Go as early as you can. Google Maps may say that the trailhead opens at 6am, but I was there by 5:30am and running with no problems. I met people on the trail who had gone up for sunrise and said they'd started at 2:30am. So no worries about the trailhead not being open.

Expect the trailhead parking to be full by 9am.

Description

From the trailhead, follow the well marked "Mt. Si Trailhead" or just follow the throngs of people on this deservedly popular trail. The endless switchbacks and steep terrain begin almost immediately, and will continue until the very top. This trail offers intermediate terrain that can be useful for both the novice hiker and a more experienced outdoors person training for a bigger objective. You'll gain more than 3000 vertical feet in under four miles of beautiful old growth forest. The canopy finally breaks close to the top, revealing some views to the South.

Once out of the forest, there are many outcroppings to enjoy your lunch and some views. Most people will stop here- but the more adventurous can continue uphill and right on a stony path to the Haystack, Mt. Si's true summit. This extra 150 ft of scrambling is class 3/4 and is well worth is as the views to the North are revealed.

On your way down please do not cut trails. What saves you 30 seconds can cause decades of damage. Also you'll need a discovery pass to park at the lot. Have fun!

Flora & Fauna

You will walk over three miles through old growth forest.

Shared By:

Benjamin Pontecorvo with improvements by David Leech

Trail Ratings

  4.4 from 117 votes

#62

Overall
  4.4 from 117 votes
5 Star
51%
4 Star
40%
3 Star
5%
2 Star
3%
1 Star
0%
Recommended Route Rankings

#4

in Washington

#62

Overall
186 Views Last Month
16,504 Since Jan 23, 2015
Intermediate/Difficult

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Photos

The exposed scrambling to the true summit of Mount Si - caution advised! Fun if you know what you're doing, but it would be very unpleasant if wet.
May 13, 2015 near Tanner, WA
Winter brings a different atmosphere to Mt. Si.
Mar 8, 2017 near Tanner, WA
Mt. Si Trail
Feb 18, 2015 near Tanner, WA
The "Haystack". People on the left ledge for scale. Look close above the triangle tree on the right, that's a climbing rope- hard core climbers!
May 2, 2017 near Tanner, WA
The Mountain is out! Clear skies abound at the top of Mt. Si.
May 2, 2017 near Tanner, WA
Sunset at the summit.
May 29, 2015 near Tanner, WA

Weather


Current Trail Conditions

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All Clear 11 days ago See History
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Check-Ins

Jun 22, 2021
Gilbert Lara
4h 30m
Jun 10, 2021
Anna Ulrich
3.3mi
May 23, 2021
Yu Chen Hou
May 23, 2021
Rachel Dier
7.8mi — 3h 10m
Apr 11, 2021
Vladimir Duk
9mi — 4h 00m
Jan 16, 2021
Monica Thorne
Dec 28, 2020
Miwa Takaki
Nov 28, 2020
Aaron Milner
6.6mi — 8h 51m