Jack Mountain East Ridge

[JDT]

I did this climb a few weeks ago and my friend did a write up that I thought I’d post here (source https://www.peakbagger.com/climber/ascent.aspx?aid=2902617). There wasn’t a ton of information on it, but overall a fun way to get up the mountain.

Jack Mountain (East Ridge) & Crater Mountain

Team: Damon, Jon, Chris
Dates: July 11-13, 2025

Short Version:
A successful 3-day trip to the seldom-climbed East Ridge of Jack Mountain with Jon. The three of us climb Crater Mountain on the way out. Jack's East Ridge is a long, serious, and committing route with sustained exposure and multiple pitches of 5th-class climbing. It should not be taken lightly. Crater Mountain provided one of the most spectacular summit panoramas in the state, a perfect reward for the intensity of Jack and a supremely appealing scramble objective by itself.

Statistics:

Total Mileage: ~25 miles

Total Elevation Gain: ~12,500 ft

Day 1 (Approach to Jerry Lakes Basin): 9 miles, +5400' / -1400', 7h 30m

Day 2 (Jack Mtn): 5.8 miles, +/- 4660', 13h 08m

Day 3 (Crater Mtn & Exit): 9.7 miles, +2390' / -6420'

Full Report
Day 1: The Approach

Our trip began at the Canyon Creek Trailhead. A quarter-mile in, we hit the ford of Canyon Creek. I was glad to have brought Crocs, which I cached on the far side. From there, the trail winds its way up and up. We left trail at 6400' to ascend towards the 7200' col. We made steady progress under warm skies.

After crossing the pass, we descended snow below the Jerry glacier into the beautiful Jerry Lakes basin. We camped near the outlet of the biggest lake, opting to bivy to enjoy the clear night. The area was scenic but quite buggy.

Day 2: Jack Mountain - The East Ridge

Jon and I set off for Jack early, moving by 4:30, climbing a goat path to exit the Jerry Lakes basin. As we reached the col, we saw Jack partially shrouded in a high cloud around 8,000 ft. From there, our route involved descending 800 feet into the adjacent basin before beginning the ascent up the SE arm of Jack. We then traversed over to the snowfield below the glacier, which led to a few hundred feet of scrambling to gain the East Ridge proper at 7,200 ft.

The East Ridge itself is a magnificent and fiercely serious undertaking. This is not a casual scramble. The route involved three distinct pitches of 5th-class climbing: one up a gully early on, a memorable and wildly exposed 5.0 crux in the middle of the ridge, and another section to gain the summit. Jon, whose extensive experience was essential to our success, led these pitches and found ok placements.

The true character of the ridge, however, lies in the terrain between the technical pitches. We spent hours moving together on exposed Class 3 and 4 rock, requiring sustained concentration. The summit, while somewhat cloudy, still offered stellar views of Baker, Shuksan, the Pickets, Ross Lake, Hozomeen, and the massive Nohokomeen Glacier sprawling below. We also took a moment to look down at the upper part of the South Face route; it looked unappealing, reinforcing our choice of the East Ridge.

The descent was a mirror of the ascent: a long, mentally taxing exercise in precision. For the 5.0 crux, Jon employed a protected downclimbing system, providing a crucial safety margin. The opening move where I had to blindly face-in downclimb over a bulge to find footholds to enter a solid crack system, with 1000' of air down to snow far below, was totally insane even with a few pieces of protection that Jon placed below me. We made one rappel lower down off an established tat anchor. We were so happy to be off the East Ridge, but proud that we made it work.

We tried to stay on snow to cross the glacial basin. As we walked over, a 20-foot snow finger near the glacier toe collapsed in front of us onto the rock. It was a powerful reminder of objective hazards and the unknowable elements of alpinism that defy simple analysis. We turned and went back the scramble way

The 13-hour day was a testament to the route's length and complexity. We made it to camp by late afternoon. The East Ridge is a route for self-reliant parties with a deep well of experience in technical rock, rope systems, and managing risk in a remote, high-consequence environment.

Day 3: Crater Mountain & The Exit

We awoke to a beautiful morning with interesting cloud formations. All three of us made the climb up Crater Mountain. The route involved fun Class 3 scrambling with some light exposure and a single, unexposed Class 4 move. The rock was loose in places, so I was happy to have a helmet.

The summit of Crater Mountain is, without exaggeration, one of the finest viewpoints in Washington State—perhaps even better than Jack's. The 360-degree panorama under clear skies was staggering. It offered the same incredible views of the major Cascade peaks, but with the added bonus of a stunning perspective of Jack's massive South Face and the beautiful Jerry Lakes basin below.

After soaking in the views for an hour, we descended and began the long hike out. The descent went quickly as we talked about Star Wars and the Matterhorn. The river crossing was downright enjoyable in the heat. A challenging, humbling, and ultimately magnificent trip to a wild corner of the Cascades.

[JasonG]

Good to see folks getting on this one!  If you want to see photos and a description of the descent down the South Face,  here is a TR from way back with my friend TJ (RIP) and @therunningdog.