Griswold Peak & North Ryan Peak
An great fall day in the Boulder Mountains
September 13, 2024
Griswold Peak (11,057') - Cougar Peak (10,727') - North Ryan Peak (11,296')

The North Fork Big Lost River drains from the east side of central Idaho’s Boulder Mountains. There are a handful of 11-thousand-foot peaks located near the headwaters, including Griswold Peak and North Ryan Peak. Its possible to combine the two peaks into a single outing, with an added bonus of visiting the highly scenic North Fork Lake as well. Throw in Idaho top 200er “Cougar Peak”, and you have the makings of a great 3-peak day in the mountains.


I made the four hour drive from Boise the night before, and slept in the back of my vehicle at the North Fork Lake trailhead. The next morning, I was ready to hit the trail!


After crossing the river/creek, Griswold Peak came into view.


Soon enough, I headed north up mostly open slopes. My goal was the saddle east of Griswold.


Steady uphill on the way to the saddle. I paused often to soak in the views.


Higher up, I found a well used game trail traversing to the saddle.


Griswold Peak from the east.


Once at the saddle, I followed Griswold's northeast ridge to the summit. Here’s a view of the final section.


On the summit of Griswold Peak, just a trace of fresh snow from yesterday's storm. Here's a view looking southwest at Cougar Peak, and North Ryan Peak. Ryan Peak towers in the background. This just happened to be my 500th summit in Idaho!


A little hard to see in this shot, but looking over the west face of the peak, I saw both a mountain goat, and a small herd of elk far below.


After a careful descent of Griswold's south ridge, it was time to head up Cougar Peak. The long east ridge of North Ryan is visible on the right.


Looking back on Griswold Peak from the summit of Cougar Peak.


Castle Peak and the White Clouds, from Cougar Peak.


From the summit of Cougar Peak, here's North Ryan Peak's east ridge, with Ryan Peak in the background


Going from Cougar Peak to the start of the east ridge wasn't too hard, but now things got interesting. From what I’d read, the ridge proper was not advisable, so I resorted to side-hilling along the south side of the ridge.


Several cliff bands of varying sizes to cross, but occasional views of North Ryan's summit kept me motivated.


Oh, and did I mention talus? Plenty of that to contend with, and loose too. Eventually I regained the ridge a couple hundred feet below the summit.


From the summit of North Ryan Peak, I had a great view of Ryan Peak, highest mountain in the Boulders.


Cougar Peak and Griswold Peak, from North Ryan Peak.


Castle Peak and the White Clouds, from North Ryan Peak.


Here's a view of North Fork Lake, my next objective, from the summit of North Ryan.


It was a tricky talus descent down to the tarns above North Fork Lake, and one cliffy section that was a puzzle to solve.


Finally finished with the steepest talus, so now I was heading to the lake.


North Fork Lake is very scenic.


My photos don't do it justice.


The last couple miles back to the trailhead are via a good, but unmaintained trail. Mostly easy to follow, just a few places where you need to watch for blazes and cut logs.


Map of my route. Just over 11 miles and 4600' elevation gain round trip, in 9.5 hours of hiking. Great day in the mountains!

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