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Hiking trails & Routes
United States
Washington
King County

Mount Si Old Trail

Hard

2.6

(13)

40

hikers

Mount Si Old Trail

03:29

5.31km

1,060m

Hiking

Hike the difficult 3.3-mile Mount Si Old Trail, gaining 3468 feet for panoramic views of the Upper Snoqualmie Valley and Mount Rainier.

Last updated: February 26, 2026

Tips

Includes a segment that may be dangerous

A part of this route comprises technical, difficult, or hazardous terrain. Specialist equipment and prior experience may be required.

After 5.20 km for 119 m

Waypoints

A

Start point

Parking

Get Directions

279 m

Viewpoint

Viewpoint

2

4.80 km

Mount Si Viewpoint

Highlight • Viewpoint

About 0.24 mile below the summit of Mount Si, this viewpoint on the Mt. Si Trail offers sweeping views of the Snoqualmie Valley through the trees. There are some boulders in the way of the view, but some will scramble around to see the view. Be careful, as veering off trail can be unsafe. The best views are close, at the summit!

Tip by

3

5.07 km

Base of Haystack Scramble

Highlight • Climb

Many hikers turn around at the boulder field further down Mount Si, wisely avoiding the scramble up the forbidding Haystack Rock in front of you. That's for good reason: Although there is a scrambling route to the top there are also legitimate, ropes-required rock climbing routes, and it's very easy to find yourself on the wrong route. Even if you stay on the scrambling route, the consequences of a fall from the Haystack would be life-changing if not deadly — and coming back down a scrambling route like this is often surprisingly more difficult than getting yourself up.

Tip by

4

5.19 km

Mount Si Peak

Highlight • Summit

The scramble up and down the final pitch is exposed and dangerous. Be careful, go slow and follow the “three points of contact” rule.

Tip by

B

5.31 km

End point

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Way Types & Surfaces

Way Types

5.15 km

119 m

< 100 m

< 100 m

Surfaces

5.19 km

121 m

< 100 m

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Elevation

Elevation

Nothing selected – click and drag below to see the stats for a specific part of the route.

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Weather

Powered by Foreca

Today

Wednesday 1 July

19°C

11°C

33 %

Additional weather tips

Max wind speed: 8.0 km/h

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Frequently Asked Questions

Do I need a permit or pay an entrance fee to hike the Mount Si Old Trail?

Yes, a Discover Pass is required for parking at the trailhead, as the Mount Si Old Trail is located within the Mount Si Natural Resources Conservation Area. You can purchase a day pass or an annual pass online or at various retail locations.

Where is the trailhead for this route, and what are the parking options?

The trailhead for the Mount Si Old Trail is located near North Bend, Washington. Parking is available at the Mount Si Trailhead parking lot. Be aware that this is a popular area, so parking can fill up quickly, especially on weekends. Arriving early is highly recommended.

Is the Mount Si Old Trail dog-friendly?

Yes, dogs are generally allowed on the Mount Si Old Trail. However, they must be kept on a leash at all times to protect wildlife and ensure the safety of other hikers. Please remember to pack out all pet waste.

What is the best time of year to hike this trail?

The best time to hike the Mount Si Old Trail is typically from late spring through early fall (May to October) when the weather is milder and the trail is mostly free of snow and ice. During winter months, snow and ice are common, making traction devices like microspikes or crampons highly recommended due to the steep grades.

What can I see along the route?

The trail primarily winds through a classic Pacific Northwest forest. As you ascend, you'll pass through sections like the Boulder Garden Loop with its moss-covered rock formations. The reward at the top includes outstanding panoramic views from the Mount Si Viewpoint, where you can see the Upper Snoqualmie Valley, Puget Sound, the Olympic Mountains, Mailbox Peak, Mount Washington, Rattlesnake Ledge, and even Mount Rainier and the cities of Seattle and Bellevue in the distance. The true summit, Mount Si Peak, involves a challenging scramble from the Base of Haystack Scramble.

How does the Mount Si Old Trail compare to the 'new' Mount Si Trail?

The Old Trail is generally considered steeper and more direct than the newer Mount Si Trail. It offers a more challenging and relentless climb, with some sections gaining about 1,000 feet per mile. It is also typically less crowded, providing a greater sense of solitude, especially on weekdays or during the off-season. The Old Trail has historical significance as the original primary path to the summit.

Is this trail suitable for beginners or families with young children?

Due to its significant elevation gain (over 1,000 meters) and steep, relentless climb, the Mount Si Old Trail is rated as difficult and is generally not recommended for beginners or families with young children. It's a strenuous hike that requires good physical conditioning.

What kind of terrain should I expect on the hike?

Expect a steep and relentless climb through a Pacific Northwest forest. The trail features switchbacks, and while generally well-maintained, you'll encounter rocky and potentially slippery sections, even in summer. During colder months, snow and ice are common, making the terrain more challenging.

Does this route intersect with other well-known paths?

Yes, while primarily following the Mount Si Old Trail, this route also passes through sections of the Mount Si Trail and the Old Si Trail. Smaller portions of the Little Si and Blowdown Mountain Trail are also encountered.

What should I wear and bring for this hike?

Given the trail's difficulty and varied conditions, wear sturdy hiking boots with good ankle support. Dress in layers, as temperatures can change significantly from base to summit. Bring plenty of water, high-energy snacks, a map or GPS device, a first-aid kit, and rain gear, even on sunny days. In winter, traction devices (microspikes/crampons) and trekking poles are essential.

Are there any cafes or amenities near the trailhead?

The Mount Si Old Trail is located near North Bend, Washington, which offers various amenities. You can find cafes, restaurants, and other services in North Bend for pre- or post-hike refreshments and supplies.

Nearby routes

Moderate

4.8

1,155

Rattlesnake Ledge Trail

02:49h

8.70km

400m

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