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Old Mt. Si Trail

Get a great workout on one of the prettiest, and steepest, trails around, and hike up into snowy winter wonderland!  The Old Mt. Si Trail is steeper, more remote, nicer, and a whole lot more fun than the regular Mt. Si Trail.

Hiking conditioning required for this hike: To sign up for this hike, you must be regularly doing hikes of 8+ miles and 3000+ feet vertical gain, or equivalent other aerobic athletic activity, such as long-distance running or cycling.


Sign-up is required to hike with our group.  Please answer the sign-up questions as best you can.  RSVP's without answers to the sign-up questions will be deleted.


• Distance: 8 miles RT

• Elevation Gain: 3700 feet

• High Point: 3980 ft

• Hiking Speed: fast, 30 minutes per mile

• Difficulty: very strenuous

• Hiking Time: ~ 5 hours

• Parking Pass: Discovery Pass required

• Dogs: Hikers only this hike.

• Carpooling: No-host carpooling is available from the Issaquah Transit Center parking garage,[masked]th Ave. NW, Issaquah, first floor, southwest corner, meeting at 8:15 a.m., leaving at 8:25 a.m.  The event leader may not be at the carpooling; those there should arrange rides amongst themselves.


• 8:15 AM – Optional meet at the Issaquah Transit Center to carpool (no-host).

• 8:25 AM – Leave the transit center.

• 9:00 AM – Meet at the Little Si Trailhead parking lot.

• 9:10 AM – Start hiking.

• ~ 11:15 AM – Arrive at Mt. Si summit.

• ~ 1:45 PM – Arrive back at the Little Si Trailhead.

Mandatory equipment: Traction devices (Microspikes or Yak-Trax) are mandatory for this hike.  (Microspikes are more rugged, easier to put on, bite deeper on ice, and the preference of most experienced winter hikers. If you purchase Yak-Trax, the Yak-Trax Pro is recommended; the standard Yak-Trax tend to break.)  Gaiters are also highly recommended.

What to bring (this is what experienced hikers wear and bring, for comfort both uphill and downhill): Sturdy hiking boots, traction devices, gaiters, light or medium-weight non-cotton clothing for the uphill, very warm mittens or gloves, light or medium-weight hat, also a warm hat, rain jacket, rain pants, extra non-cotton shirt to change into at the top, warm, dry clothes, preferably fleece, for the downhill, 1.5+ liters of water, snacks and/or light lunch, sunglasses, sunscreen, day-pack large enough to hold all the above. Optional and recommended: hiking poles, camera, waterproof pack-cover, hot chocolate!

Directions to Trailhead: From Seattle drive east on I-90 to exit 32 (436th Avenue SE). Turn left (north) over the freeway and drive 0.5 mile to a tee into North Bend Way. Turn left, and in 0.25 mile (New Dawn espresso stand on the corner), turn right onto Mount Si Road. Go over the red bridge, pass the overflow parking lot on you left, and turn left into the signed Little Si trailhead.

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  • Heidsinsight

    Did I goof? I'm at the transit center and don't see anyone.,.

    December 7, 2013

    • Aaron S

      Heidi, an unfortunate possibility with no-host carpooling; I'll let you know about all cross-posted meetups next hike so you can broadcast for a ride/coordination, and I'll post my cell phone number in case this sort of last-minute coordination is needed. See you next hike, and considering your time, trouble and transport expense this go-round, the group will at the least buy you a beer and bite at the next post-hike function.

      December 9, 2013

  • Aaron S

    Great workout, as usual this trail, beautiful weather, great group of folks to hike with. And the cold made it a fun adventure. Thanks all for a thoroughly enjoyable hike.

    December 8, 2013

  • Aaron S

    See everyone tomorrow. Besides the obvious gear for cold-weather hiking, including very warm mittens and hat, be sure to dress in layers and bring an extra non-cotton shirt to change into at the top. This hike is steep enough that you'll sweat on the way up, and when you stop exerting, it is important to eliminate the evaporative cooling from a wet shirt.

    December 6, 2013

  • Aaron S

    For anyone interested in a post-hike beverage and bite (... and fireplace!), we'll stop at the North Bend Bar and Grill after the hike.

    December 5, 2013

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