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    Red Mountain via Old Commonwealth Trail

    This reflects the 10Adventures difficulty rating for each route. We aim to keep ratings consistent across regions.
    This reflects the estimated time the majority of users will take on this trail. If you are slower, add time to the top-end figure. If you are fast, then you may complete this route faster than this time range.
    This reflects the return distance of this route as measured by the GPS file.
    9.5 km
    This reflects the total elevation gained throughout this route as measured by the GPS file. This includes all ascents and descents, and is higher than what is quoted in most route guides, which simply measure the distance between the starting-point and high-point of the route.
    846 m
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    Directions to Trailhead

    Red Mountain via Old Commonwealth Trail is a 9.5 km hard hike in Mount Baker-Snoqualmie National Forest that provides a fun dose of adventure with a scrambling section. Expect several river crossings, great views, and some hard work.

    There is some overgrowth at the beginning of this hike, but it’s nothing impassable. We don’t recommend Red Mountain for those who are uncomfortable with heights or exposed scrambles. While dogs are allowed on this trail, we do not recommend trying to bring them up the final mile to the summit as it’s very steep, technical, and rocky.

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    Route Description for Red Mountain via Old Commonwealth Trail

    Old Commonwealth Trail is a great hike throughout the year, and it provides access to the thrilling ascent of Red Mountain, which involves a sky-high scrambling section. This is a good hike for those comfortable with exposure, heights, and intermediate scrambles.

    Begin at the PCT trailhead. The Old Commonwealth Trail split off left from the PCT very quickly—take this. Stay right through two junctions and cross the creek. This first mile or so is quite flat and relaxed, but also deep in thick brush and potentially overgrown.

    When you cross Commonwealth Creek, look for a bridge to use to cross and then return to the trail. Head northwest, you’ll merge onto Commonwealth Basin Trail. A handful of stream crossings lead you up to where you’ll begin to climb a bit more aggressively, hiking through very narrow switchbacks.

    Stay right at the junction around 1,480 m and begin your ascent of Red Mountain. It’s fairly short in terms of distance, but expect the last mile or so to take longer as you navigate the scramble. Some hikers report feeling uncomfortable and turning around before the summit, which is exactly what you do if you feel too far outside of your comfort zone on this section. Otherwise, after enjoying the summit, you’ll retrace your steps back to the trailhead.

    Getting to the Red Mountain via Old Commonwealth Trail Trailhead

    The trailhead for Red Mountain via Old Commonwealth Trail is in Snoqualmie Pass at the PCT trailhead off Alpental Access Road.

    Route Information

    • Backcountry Campground


    • When to do


    • Pets allowed

      Yes - On Leash

    • Family friendly


    • Route Signage


    • Crowd Levels


    • Route Type

      Out and back

    Red Mountain via Old Commonwealth Trail Elevation Graph

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    Red Mountain via Old Commonwealth Trail Reviews

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