Page Type Page Type: Mountain/Rock
Location Lat/Lon: 43.99530°N / 113.611°W
Additional Information Elevation: 11071 ft / 3374 m
Sign the Climber's Log


Often overshadowed by it's impressive older brother, Mt. McCaleb, Little Mac rises above 11,000 feet and offers steep scrambling.  The seldom seen (access is from the upper reaches of Upper Cedar Creek) vertical north face of Little Mac is longer than Mt. McCaleb's impressive south summit wall.  The two peaks are easily done together- there is a major saddle at 10,600 feet between them.  Situated at the southern end of the Lost River Range, Little Mac and Mt. McCaleb are some of the first of the larger peaks that you'll notice when driving north from Arco.  The Lost River Range is a relatively dry mountain range.  By the time the prevailing storm tracks reach this area, they would have crossed the dry Oregon or Nevada Desert. Storms from the west must pass through the Boise Mountains, The Sawtooths, The White Clouds, The Boulder, and the Pioneer Mountains before reaching the Lost River Range. Storms usually have little snow left to dump on these mountains. And what snow falls is so powdery from the extreme cold and dryness, that it often blows off the nearby mountains.  This presents nice winter opportunities for climbers. For example, this author summitted Little Mac and McCaleb in the third week of December and encountered only patchy snow and 50% rock.  Like all climates there are exceptions and these mountains can get dumped on.

Here are the routes on Little Mac:

1)  South Ridge (Class 3) - From the southern base of the mountains, at the end of the Jeep roads, follow the prominent gulley that runs between Little Mac and McCaleb.  Stay left of the gulley from 8000 feet. At 9200 feet you'll reach a nice knoll with great views of McCaleb.  Follow the steep prominent ridge slightly to your left up the prominent south ridge of Little Mac.  After a very steep initial ascent,  a few easy rock towers and cornice crossings lead you to the summit.  Continue east down to the saddle if you plan to climb McCaleb.

Total Distance / Elevation gain from end of Jeep roads: 3.25 miles / 5000 feet   (Red route on the topo map)

2)  Gulley Route (Class2-3) -  At the prominent knoll at 9200 feet, follow the major drainage north between the peaks on pure boulders and rock scree (no large vegetation after 9200 ft) until you reach the prominent saddle at 10,600 feet. From here climb the east ridge up to Little Mac.

Total  Distance /  Elevation gain from end of Jeep roads: 3.25 miles / 4950 feet   (Green route on the topo map)

The north side of the peak has huge rock and snow climb potential.

Summit Panorama

The summit view from Little Mac including Lost River Peak, Far Away Mountain, USGS Peak, and Mount McCaleb.

Getting There

Road Approach

From Highway 93 in Mackay, turn northeast near the center of town and drive for 2.1 miles on Bench Road. You'll bear right at the Mt. McCaleb Cemetery  Go left onto Cedar Creek Road and follow a drainage ditch until your near the opening of the canyon (3.7 miles). Bear left (east) along the base of the hill and look for one of a few Jeep roads. Follow the roads as high as you are comfortable with. (We parked a Jeep Grand Cherokee at 7500 feet in December- It's possible to park as high as 8100 feet)

Note- If you drive from Boise, you will pass Craters of the Moon NP:

Hiking Approach

Follow the prominent drainage gulley coming down from between the peaks. Use shortcuts at your own risk- you could get cliffed.  Once at 9200 feet, it's wide open and obvious.

When To Climb

Standard climbing season is April through November  Conditions may vary greatly.  There are periods of very dry and cold weather in the winter. 

Nearby Mackay, Idaho Climate Data:

Jan Feb  Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual
Average Max. Temperature (F)  29.2 34.2  43.0 55.2 65.2 74.1 84.1  82.7 73.3 60.1 42.1  31.3 56.2
Average Min. Temperature (F) 5.6  10.1 18.9 28.1 35.9  42.3  48.4 46.3  38.3  30.0 18.7  8.9 27.6
Average Total Precipitation (in.) 0.78 0.61 0.61 0.68 1.09 1.34 0.93  0.80 0.67 0.57  0.59   0.78  9.43
Average Total SnowFall (in.) 7.5 5.9  2.4 0.5 0.1  0.0  0.0  0.0 0.1  0.2  2.0  7.3  26.1
Average Snow Depth (in.)  4 1 0  0 0 0 0  3  1

For general comparison, the Lost River Valley is much drier (climatologically a desert) in the winter than the Sawtooth Valley. Yet in the summer, the Lost River Valley receives more precipitation.  It is quite warmer in the Lost River Valley than the Sawtooth Valley, especially in October.

Mountain Conditions


Latest Avalanche Report (Sawtooth Area, yet it still can be useful)

Salmon-Challis National Forest Info

National Weather Service Current Forecast for Mackay:

Red Tape

There are no hiking, backpacking or parking regulations or fees.  



  • There are many drive-in camp sites at Mackay Reservoir
  • You could camp near where you park- camping would be difficult higher on the mountain.  Water sources are scarce.

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