Mount Si via Old Si Trail is a 6.1 mile heavily trafficked out and back trail located near Snoqualmie, Washington that features a great forest setting and is rated as difficult. The trail is primarily used for hiking, nature trips, and bird watching and is best used from April until September. Dogs are also able to use this trail but must be kept on leash.

Length6.1 miElevation gain3,556 ftRoute typeOut & back
Dogs on leashHikingNature tripsBird watchingForestViews
Waypoints (0)
Tips

Please note that though this trail is open year round, it is often covered in snow during the winter months and may be impassable. Discover Pass is required.

Weather
UV Index
Daylight
Reviews (284)
Photos (2,030)
Recordings (324)
Completed (584)
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Albert Klym
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Hiking
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Erika Feldman
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Hiking
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Craig McDonell
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Hiking
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Na The Tiger
Yellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarMarch 3, 2021
HikingSnow

Started super early morning exercise. Need microspikes. Slushy snow starts at 2+ miles and some icy. Spent almost an hour at the top for photographs and sunbathe since it was a beautiful sunny day and I was the only one at the summit. View was gorgeous!

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Alan Lenny
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Hiking
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Darwin Mendyke
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Backpacking

Low visibility at the summit. Hard packed icy/slushy trail starting about a 1/3rd of the way up Mt. Si

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Utkarsh Simha
Yellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarGray StarGray StarFebruary 20, 2021
Hiking

Good conditioning hike. The trail was quite crowded and views weren't the best. Hike kicked my ass

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Anirudh Kashi
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Hiking
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Wayne Swan
Yellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarFebruary 2, 2021
Hiking

Wow. only 4 other hikers. Rain dwindled but turned 5o snow the last 800 ft or so. Windy and cold with some snow but didnt slip in just mah bootz! 1st time doing the Old Trail and man, what a quad burner. Loved the solitude.

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Bill Fuerstenberg
Yellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarJanuary 30, 2021
Hiking

Awesome and challenging hike, I have never done it before. Needed spikes and poles on descent especially in snow to avoid mishaps. Didn’t pay attention on descent and ended up adding a loop ... and it got dark so I used my headlamp and was fine. To my surprise there were actually people going up in the dark! Enjoyed the hike and exercise. 99% of people wore masks ... I think you he one guy not lost his.

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Daniel Hartman
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Hiking

Good conditions

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Pär Åkerblom
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Hiking
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Chris Campbell
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Hiking

Can

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JhayLeonette Hunt
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HikingGreat!

Butt kicker

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Michelle Lazarov
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Hiking

Very little mud on the trail. Very little snow at the top, but I put on traction to go around the rocks because I'm terrified of slipping. Haystack not even considered.

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Artur Klauser
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Hiking
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Suzanne Blanchard
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Hiking

Great trail and unpopulated today. A little snow at the top. I put on micro spikes but probably didn’t need them. Beautiful view!

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Erika Feldman
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Hiking
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Elly West
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Hiking
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Bruce Burger
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Hiking
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Alycia Lee
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Hiking
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Joe Meyers
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Hiking
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Erika Feldman
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Hiking
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Mariana S
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HikingGreat!

Nice trail. Easier to follow and also much easier in terms of difficulty in comparison to old Mailbox. A few muddy spots. The last third of the trail is covered in snow. People did it without spikes, but I personally was happy to have them, in particular for the way down.

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Zain Ali
Yellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarGray StarGray StarOctober 17, 2020
Hiking

Hard hike. Not that scenic throughout but the top is beautiful. Bring snow shoes if there’s still snow on the trail otherwise you won’t be able to continue

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Dino A
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HikingGreat!RockyScramble

I decided to try this trail after hearing about it and how it compared to the newer, more popular Mount Si trail. All in all, everything I read was accurate. The trail is a steep, sometimes rocky, tough, less trafficked workout. If I had to compare it to any other trail, I'd call it Mailbox Peak Old Trail Lite, although you run into fewer people on this one. The only reason I'd say it's slightly easier (although still in the same class) is that there are a few rare sections where the grade of steepness decreases or even levels out for a short period of time. This occurred a few times when the old trail was about to intersect the new Si trail. Make no mistake, though: savor the easier sections and conserve your energy while you can, because this trail will have you pay back every inch once it veers sharply upward again. The views at the end, especially on a clear day, are worth it. And maybe the soreness is its own kind of reward. The trail conditions were good. Wider toward the beginning and end (when coming off Boulder garden and intersecting with new Si trail), and a bit narrower and rockier toward the middle. There was a small tree downed across the trail in one part that would require walking along the edge of the trail to get around. So it's necessary to be careful with footing (I wouldn't say it's great for trail running but there was one guy doing just that).

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Eric Spevacek
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Hiking
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Ashley Belline
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Hiking

Love doing the old trail. More of a challenge and a good time.

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