California · Rock climbing · Mammoth Lakes

Brother Boulder

Brother Boulder in California has 7 bouldering routes with 4 difficulty grades.

7 routes
V0 – V4
Bouldering

Is Brother Boulder open right now?

Alert in the area

The Forest Service lists 4 alerts for Inyo National Forest.

As of · Source: USFS · Inyo National Forest. Agencies don't list every closure — check before you go.

Best time to visit Brother Boulder

Best months: May–September. Best months have typical highs of 55–85 °F, lows of 30 °F or warmer (32 °F where the station doesn't record snow), at most one snowy day and no more than 12 wet days.

  1. Jan

    41° / 17°

  2. Feb

    41° / 18°

  3. Mar

    45° / 22°

  4. Apr

    51° / 27°

  5. May

    60° / 35°

  6. Jun

    70° / 42°

  7. Jul

    78° / 49°

  8. Aug

    77° / 47°

  9. Sep

    71° / 40°

  10. Oct

    61° / 30°

  11. Nov

    49° / 23°

  12. Dec

    41° / 17°

Typical high / low (°F) and days with rain or snow, 1991–2020. Measured at Mammoth Lakes Rs, CA, 4 mi away at 7,804 ft. The station sits about 1,200 ft lower than this place, so expect it a little cooler here. This station doesn't record snowfall. Source: NOAA NCEI U.S. Climate Normals 1991–2020.

Brother Boulder is a bouldering area in the Mammoth Ranger District of Inyo National Forest in California, managed by the Forest Service. It sits among a cluster of climbing spots, with Sister Boulder just 0.1 mile away and Dog Boulder about 0.4 mile off. Lake George Campground and Lake Mary Campground are both within about a third of a mile, making it easy to base a trip here. The climbing is all bouldering, with seven routes ranging from V0 to V4. Kid Brother is the easiest at V0, and Big Brother is the hardest at V4. The routes are named Problem A, Problem B, Problem D and Problem E, with Problem E at V1+. Summer is the most comfortable time to visit. Typical averages from a nearby weather station at Mammoth Lakes show July highs around 78°F and lows near 49°F, while winter highs stay around 41°F. That station sits about 1,150 feet lower than the boulders, so temperatures on the rock run cooler. The Barrett Lake to Lake Mary hike and the Mammoth Crest hike both start about 0.2 mile away. Paddlers can reach Mammoth Creek about 3 miles off.

Routes (7)

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