Alpine Lakes Wilderness High Route

26+ mile loop, 1-3 nights
8,400+ gain
Late Summer
Northwest Forest Pass
The Alpine Lakes Wilderness is home to over 700 mountain lakes nestled among snow-capped peaks. Known for its beauty, variety of terrain, and proximity to Seattle, the Alpine Lakes Wilderness is a major backpacking destination for beginner to expert hikers.
While incredibly beautiful, this route is an extreme challenge with off-trail elements. Expect route-finding, miles of granite boulders, and gruelingly steep elevation changes will test all but the most physically fit hikers or trail runners.
Chimney Rock
Trail Map

Getting There and Parking

The Alpine Lakes High Route can be started one of two trailheads, the West Fork Foss Lakes Trailhead or the Necklace Valley Trailhead. I recommend beginning at the West Fork Foss Lakes Trailhead and hiking the loop clockwise, ending at the Necklace Valley Trailhead.
West Fork Foss Lakes Trailhead
Note that the two trailheads are separated by a 2.5 mile gravel road, which must be shuttled, walked, or hitch-hiked. When we backpacked this, we left our packs with one person at the Necklace Valley Trailhead, while the other jogged to pick up our car from the West Fork Foss Lakes Trailhead.
If you plan on hitching a ride, you're more likely to find one earlier in the day. By mid-afternoon, I ended up jogging all the way to the car.

Hike Details

Hiking the Alpine Lakes High Route requires navigation skills, the use of maps or following GPS tracks, and excellent physical conditioning. The off-trail sections are extremely difficult, and shouldn't be attempted by novice backpackers. Backpacking Big Heart Lake, Tank Lakes, or Chetwoot Lake can be a great alternative if you're not up for the full loop!
Big Heart Lake
Starting from the West Fork Foss Lakes Trailhead, the trail ambles for 1.5 miles through the forest until you arrive at Trout Lake. Trout Lake is the first of many lakes you'll encounter on the Alpine Lakes Loop, popular for day hikers and fishermen. If you had a late start, there are several decent campsites near the lake.
Trout Lake
The elevation gain picks up after Trout Lake, ascending a series of switchbacks for 2.5 miles to Copper Lake. Copper Lake is a popular camping area, and often fills up with backpackers on summer weekends.
The trail hugs the southeast edge of Copper Lake before climbing to Big Heart Lake. You'll cover 2.7 miles of trail from Copper Lake to Big Heart Lake, with the much smaller Little Heart Lake en route. Big Heart Lake is a well-known, well loved backpacking destination and one of my favorite places to camp in the wilderness.
Big Heart Lake
There are a few campsites immediately as you reach Big Heart Lake, with the majority being across the logjam on social trails as you climb up from the lake. Competition for campsites can be fierce, so I suggest arriving earlier in the day or on weekdays if you want a choice spot close to the lake. The swimming and fishing are great here, though the water is cold!
Big Heart Lake 2
Trail to Chetwoot
The trail grows more rugged beyond Big Heart Lake, with rapid changes in elevation and patches of boulders - a hint of what's to come. For 2.6 miles, follow the ridge between Big Heart Lake and Angeline Lake until you reach Chetwoot Lake. The trail down to Chetwoot is precipitous, and can be difficult if you have a heavy pack. Right before you reach Chetwoot Lake, it's easy to get turned around - if you find yourself dropping down to Angeline Lake, double back over the small stream out of Little Chetwoot Lake, then manoeuver the boulders along the GPS track.
Chetwoot Lake
Chetwoot Lake is stunningly beautiful, a great destination itself and has several wonderful campsites. We stopped here for a lunch and a swim, and rested in the sun for a while. Beyond Chetwoot Lake the already faint trail nearly disappears, being replaced primarily with cairns. Navigation skills are critical here, as you will be following cairns or a GPS track over jagged granite boulders.
Going up from Chetwoot
The 1.2 miles from Chetwoot Lake to Iron Cap Lake are entirely over granite, following cairns the whole way. It's slow going (unless you're an expert trail runner), and took us nearly 2 hours to hike with our backpacks. As you climb over the rocks, make sure to watch your footing for loose or slippery stones.
En route to Iron Cap Lake
The route rises to Iron Cap Lake, tucked in a cirque below Iron Cap mountain. This is a great spot to rest and refill your water before making the push to Tank Lakes. Iron Cap Lake is iced much of year excepting late summer or particularly warm years, and the water is very cold. Keep to the north side of the lake, exiting the cirque near its outlet.
Iron Cap Lake
The route hugs the side of Iron Cap, dipping steeply before beginning the climb to Tank Lakes. It's a grueling 2.4 mile slog through rough terrain, continuously going up or down rocky slopes. As you come within 1 mile of Tank Lakes, the path levels out and becomes easier for the final push.
Iron Cap Lake
By the time we reached Tank Lakes, we were absolutely exhausted, quickly setting up camp to have dinner and take a refreshing dip in the lake. Tank Lakes is my favorite spot on the hike, with a jaw-dropping view of multiple peaks across Dutch Miller Gap. I highly recommend camping here, though it can get busy with other backpackers out of Necklace Valley.
Tank Lake
Tank Lake breakfast
As you hike out from Tank Lakes, the path drops rapidly through a granite field, continuing down until it meets the Necklace Valley trail. As you exit the final boulder field an enter the trees, keep an eye on your GPS track to avoid getting turned around. There are a lot of social trails here, dispersing in random directions.
Tank Lake pond
From the last boulder field you have about 9 miles to hike out to the Necklace Valley Trailhead. The first mile passes through the Necklace Valley, with several small lakes (Opal, Emerald, and Jade). There's plentiful camping opportunities here if you're wanting to stay another night. Thankfully, there's an actual trail here which is easy to follow.
Once you reach Jade Lake, the trail descends over 4 miles to cross the East Fork Foss River. The 5 miles to the Necklace Valley Trailhead are relatively flat, easy going through the forest. At the Necklace Valley Trailhead, you either have your shuttle car waiting, or a 2.5 mile gravel road walk to the West Fork Foss River Trailhead.
This was one of my top backpacking trips of the year, but it's difficult to recommend due to its difficulty. If you're up for a challenge, and have experience navigating on rougher terrain, the scenery in the Alpine Lakes Wilderness will be some of the best you can find in Washington State.

What to Pack



Goat Lake Campsite

Camp Kitchen

Oatmeal at Ramona Falls


Backpacking near Jade Lake in the Alpine Lakes Wilderness


Backpacking the Timberline Trail on Mt. Hood


Still have questions? Send me a message over email to connect. Happy Trails!
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Heart Rock at Joshua Tree
Thanks for visiting our travel blog, Trails And Trekking! We're Lauren and Anders - an adventure loving couple currently stationed in the Pacific Northwest. We're avid hikers, backpackers, and travelers. We're both originally from Oregon, but we've spent the last two years traveling the Pacific Northwest and beyond. We created this blog to share our passion for exploring the outdoors, and to inspire you to get outside.