Boulder Mountains (ID)

Page Type Page Type: Area/Range
Location Lat/Lon: 43.85112°N / 114.58054°W
Activities Activities: Hiking, Mountaineering, Ice Climbing, Scrambling, Skiing
Seasons Season: Spring, Summer, Fall, Winter
Additional Information Elevation: 11714 ft / 3570 m
Sign the Climber's Log

The Heart of Idaho

The Boulder FrontThe Boulder Front
The Boulder Mountains are a massive, high, and rugged mountain range in the very heart of Idaho. The range stretches from Ketchum in the South, nearly to Challis in the North. Highway 75 and the East Fork of the Salmon River form its western border while the Big Lost River Valley and the Pioneer Mountains are to the East and South. The range is increasing in popularity especially for backcountry winter sports as the highest portion is quite near the Sun Valley ski resort and is easily accessed from highway 75. Many of the high peaks have broad ridges that are conducive to winter climbing and large bowls with excellent skiing when conditions are right. In the summer the southern end of the range is a fairly popular hiking destination with many developed trails. However, solitude can still easily be found. Popular by Idaho standards means that (Gasp!) you might run into someone else during the day.


The Boulders rank as one of Idaho's highest mountain ranges with at least 12 summits topping 11,000 ft. and more than 16 other peaks over 10,000 ft. Most of the highest peaks are located in the southern portion of the range along what is known as the Boulder Front. This is the impressive wall of peaks that can be seen along the East side of highway 75 as one travels between Ketchum and Stanley. Here elevation gains can be as much as 4,000+ ft. and there are no intervening foothills. At 11,714 ft., Ryan Peak is the highest peak in the Boulders but it is not visible from any major road.
Ryan Peak as viewed from the...Ryan Peak

Geologically the range is quite complex and contains everything from granite to Challis Volcanics. The Boulders were once extensively mined and at one time the mining town of Boulder was Idaho’s highest town at 10,000 ft. Galena, the source of lead, was one of the most heavily mined minerals in the range. There are many landmarks named after the ore including the town of Galena, Galena Peak, and Galena Summit, where Idaho’s highest paved road is.

There is little in the way of technical climbing (although if you know where to go and who to talk to there are a few good snow and ice climbs) because the rock is so loose and rotten. As Tom Lopez puts it in his book, Idaho: A Climbing Guide, “Although there is stiff competition for the honor, the Boulder Mountains win the prize for being Idaho’s most rotten mountains. Even rock that appears solid will crumble in your hands.”


The area near the Boulder Front is heavily forested and is green and verdant. As you go to the North the range becomes more desert like and there a lot fewer trees. During the winter the Boulder Front can receive a large amount of snowfall that can linger on into the summer months.
Peak 10941 RidgeSnowy Peak 10,941, June 2011

Climate Ketchum
Source: U.S. Climate Data

All the typical Idaho wildlife is present in the Boulders including a very large population of Mountain Goats. They can commonly be seen on the steep slopes of the peaks along the Boulder Front. In fact, there is a mountain goat viewing site along the highway to the West of Boulder Peak.



Boulder Mountains MapThe Boulders Area

As of August 2015 Rep. Mike Simpson's Wilderness bill for this area has passed creating nearly 300,000 acres of new Wilderness in the Boulder-White Cloud area. More info will be added as it becomes available.


The range is divided into four major divides by Tom Lopez in Idaho: A Climbing Guide. Those divisions will be followed here. The class column refers to the easiest route to the summit.

Northern Divide

Kent Peak from Ryan Peak s...Kent Peak

PeakElevation (ft.)ClassUSGS Quad
Lone Pine Peak9,6582Lone Pine Peak
Anderson Peak9,3392Horse Basin

Sheep Divide

Galena Peak rising from the...Galena Peak

PeakElevation (ft.)ClassUSGS Quad
Sheep Mountain10,9152Bowery Peak
Peak 10,88310,8832Bowery Peak
Bowery Peak10,8612Bowery Peak

East Fork/North Fork Divide

Close-up of Meridian PeakMeridian Peak

PeakElevation (ft.)ClassUSGS Quad
Griswold Peak11,0572Ryan Peak
Peak 10,55210,5522Jerry Peak
Meridian Peak10,400+2Meridian Peak
Jerry Peak10,0152Jerry Peak
Herd Peak9,8602Herd Peak

The Boulder Front

PeakElevation (ft.)ClassUSGS Quad
Ryan Peak11,7142Ryan Peak
Kent Peak11,6642Ryan Peak
Glassford Peak11,6022Ryan Peak
Peak 11,45811,4583-4Ryan Peak
Lorenzo Peak11,240+3Easley Hot springs
Perkins Peak11,220+3Ryan Peak
Cerro Ciento11,1542Easley Hot Springs
Galena Peak11,1532Galena Peak
Silver Peak11,1123Easley Hot Springs
Easley Peak11,1082Easley Hot Springs
Boulder Basin Peak11,0413Easley Hot Springs
Boulder Peak10,9813Easley Hot Springs
Peak 10,94110,9412Easley Hot Springs
Mystery Peak10,7853Meridian Peak
The Cone10,6802Ryan Peak
Peak 10,59810,5982-3Rock Roll Canyon
Peak 10,56610,5662Rock Roll Canyon
Rock Roll Peak10,4582Rock Roll Canyon
Basils Peak10,4142Amber Lake
Gladiator Peak10,2432Horton Peak
Peak 10,12610,1263Horton Peak
Avalanche Peak9,4332Horton Peak
The Cross9,2252Horton Peak

Getting There

Perkins Peak on the hike to Meridian PeakPerkins Peak
Window LakeWindow Lake
Highway 75 provides easy access to the high peaks of the Boulder Front. There isn't very far to go off the road to begin climbing. Getting into the heart of the range is another matter. Many of the roads are high clearance, 4WD only and are some of the most rugged in the state. The range can also be accessed via the Trail Creek Road and the East Fork Salmon River Road. For more specifics I refer you to the many wonderful guidebooks and peak pages available for the area.

Red Tape

What's that? This is Idaho! Wander to your heart's content.


There are many wonderful campgrounds in and around the Boulders but there are limitless opportunities for backcountry camping in the range.

Please remember to practice Leave No Trace when camping in pristine areas.

External Links

Sawtooth National Forest-Ketchum Ranger District

Sawtooth National Recreation Area

Idaho: A Climbing Guide The Idaho Climbing Bible.

Idaho Outdoors Forum. Where the locals chat about the mountains. Great trip reports and pictures. This link goes to his Boulders page. Parent site of the Idaho Outdoors Forum with tons of trip reports.
Lorenzo Peak when viewed from...Lorenzo Peak

Taken from Silver Lake, this...Solitude in the Boulders

Additions and CorrectionsPost an Addition or Correction

Viewing: 1-4 of 4

hgrapid - Jun 18, 2011 6:03 pm - Hasn't voted

Problem with Map

IdahoKid has Boulder Basin Peak in a way off latitude, so if you open your interactive map, it doesn't work so well due to his error. I contacted him to fix it.


mtybumpo - Jun 18, 2011 6:53 pm - Hasn't voted

Re: Problem with Map

Which map are you referring to? Thanks for the heads up!


hgrapid - Jun 18, 2011 9:46 pm - Hasn't voted

Left hand side

On the left hand side Children Mountains & Rocks (15) [Map]


mtybumpo - Jun 18, 2011 11:39 pm - Hasn't voted

Re: Left hand side

I see now. I never noticed that before.

Viewing: 1-4 of 4



Children refers to the set of objects that logically fall under a given object. For example, the Aconcagua mountain page is a child of the 'Aconcagua Group' and the 'Seven Summits.' The Aconcagua mountain itself has many routes, photos, and trip reports as children.