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Mount Aix

Mount Rainier Area > Chinook Pass - Hwy 410
46.8139, -121.3055 Map & Directions
12.0 miles, roundtrip
Elevation Gain
4,650 feet
Highest Point
7,766 feet
Calculated Difficulty About Calculated Difficulty
  • Mountain views
  • Dogs allowed on leash
  • Summits
  • Ridges/passes
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The Mount Aix trail leads to a lofty world above the tree line, with views in all directions, and access to other trails for wandering in the open. On a clear day, you can see Mount Adams, Mount St. Helens, the Goat Rocks, Mount Rainier, and the Stuart Range, just to mention the more identifiable peaks. Continue reading

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Hiking Mount Aix

The Mount Aix trail leads to a lofty world above the tree line, with views in all directions, and access to other trails for wandering in the open. On a clear day, you can see Mount Adams, Mount St. Helens, the Goat Rocks, Mount Rainier, and the Stuart Range, just to mention the more identifiable peaks.

Mount Aix is the 40th most prominent peak in Washington, with a prominence of 3296 feet (1005 meters). Its summit elevation is variously listed as 7766, 7759, or 7770 feet. Regardless, it is the 33rd highest peak in the state. The origin of the name Aix is unknown. Reportedly, an 1885 map showed it as “Mt. Aiks”. The pronunciation is generally accepted to be “aches”. (Insert your own joke here.) Taking advantage of the prominence, a lookout cabin occupied the summit from 1923 to 1961. Cables and minor construction debris are still present.

The trail starts out at 3700 feet on a dusty path leading through moderately thick forest. At 0.3 mile is an easy stream crossing. In late summer, this is the only source of water along the trail. Make sure you are carrying enough for what lies ahead.

At 0.4 mile, the trail traverses to the south, at first level, and then gaining ever more in steepness until beginning a series of switchbacks a half mile later.  The switchbacks and traversing combine to take you through a steep-sloped forest, featuring numerous and diverse varieties of trees. See how many different types you can identify. At 2.5 miles the canopy begins to thin, and the shade lessens. Finally, one last long traverse takes you up to an exposed ridge at 7150 feet, 4.4 miles. A weathered sign at a junction identifies the Nelson Ridge Trail #984 to the left. To the right and up continues the Mt. Aix Trail #982. Both of these trails connect to a third, the Richmond Mine Trail #983, as part of a 17-mile loop that stays above 4400 feet. The loop gets little use however, and may require routefinding skills.

Mount Aix is still hidden from sight. The peak visible a half mile to the north is the unnamed high point along the Nelson Ridge Trail. It affords a better view of Bumping Lake, and a clear view of the northwest side of Mount Aix. The trail is easy to follow, gaining 425 feet and losing 60 feet in 0.5 mile. The point at 7537 feet is a short 150 foot scramble off the trail.

But that’s not why you’re here, is it? To get to Mount Aix, continue traversing uphill to the right. At 4.7 miles, the trail crests over a ridge and heads east, with your destination finally, gloriously, visible. Because of its southwest exposure, these upper elevations of the Mount Aix trail melt out earlier than other trails, leaving little more than rocks - talus, scree, rubble - call it what you want, you will want to watch your footing.

At 5.35 miles, you have a choice. A scramble trail heads sharply upward to the summit, gaining 300 feet in a mere eighth of a mile. The official route is another 0.65 mile, 5 times as long. The first half of it traverses a loose, rocky, and unstable slope, with small ups and downs, but no net gain or loss. The second half doubles back to the north, twisting and climbing up an exposed rocky rib, into a basin to the southeast of the summit, for the final push to the top. Evaluate your choice based on your own skills and comfort level, and the conditions. If you choose the scramble, you will almost certainly want to use your hands at some point. Are you comfortable with that? Do you want to stash your trekking poles in your pack? If others are on the route, there is a significant risk of having loose rocks kicked down on you from above. On the official route, the biggest risk is ice on the steep slope, or if melted out, the tread itself, which suffers from loose rocks constantly sloughing downhill. Turning back is also an option; the peak along the Nelson Ridge Trail is a lot easier. (The mileage provided in this guide is for the longer, official trail to the summit, and back along the same route.)

From the summit, enjoy the aforementioned views. Look for mountain goats, identify peaks, or perhaps plan a future excursion from the perfect vantage point. Do you want to make the side trip to Nelson Ridge today, or save it for another trip?

Hike Description Written by
Ken Giesbers, WTA Correspondent

Mount Aix

Map & Directions

Co-ordinates: 46.8139, -121.3055 Open in Google Maps

Before You Go

Chinook and Cayuse Passes are closed for the season

See weather forecast

WTA Pro Tip: Save a copy of our directions before you leave! App-based driving directions aren't always accurate and data connections may be unreliable as you drive to the trailhead.

Getting There

From Cayuse Pass (the intersections of State Routes 410 and 123 east of Mount Rainier), drive east on SR 410 for 22.5 miles, then turn right at the sign for Bumping River. Or, from the intersection of U.S. 12 and State Route 410 (northwest of Yakima), drive 28 miles on SR 410 then turn left at the sign for Bumping River.

Drive 11.1 miles of pavement, then 2.4 miles on rocky and dusty FR-1800. At the sign for “Deep Creek”, bear left on FR-1808 the final 1.5 miles. When you see the “Mt. Aix” sign pointing left, look for a place to park. There is no well-defined parking lot, and the very rough but short road to the left gets you only a tiny bit closer. There is room for 12-15 vehicles within 100 yards of the trailhead. There are no amenities. Even though there are no signs, a NW Forest Pass is required.

More Hike Details


Mount Rainier Area > Chinook Pass - Hwy 410

Mount Aix (#982)

Okanogan-Wenatchee National Forest, Naches Ranger District

Guidebooks & Maps

100 Classic Hikes - Washington (Craig Romano

Mountaineers Books)

Download a map to plan your hike

Buy the Green Trails Bumping Lake No. 271 map

Buy the Green Old Scab Mtn No. 272 map

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Mount Aix

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