California · Rock climbing · Mammoth Lakes

Sector A

Sector A is a California bouldering crag with 18 routes across 6 grades.

Sector APhoto: Ken Lund, CC BY-SA 2.0 (via Flickr)
18 routes
V0 – V2
Bouldering

Is Sector A 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 Sector A

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, 2.6 mi away at 7,804 ft. The station sits about 500 ft higher than this place, so expect it a little warmer here. This station doesn't record snowfall. Source: NOAA NCEI U.S. Climate Normals 1991–2020.

Sector A is a bouldering area in the Mammoth Ranger District of Inyo National Forest in California, managed by the Forest Service. It sits among several climbing sectors, with Sector B and Sector C each about 0.1 mile away. The area is a cluster of boulder problems, with 26 routes in total. Most are rated V0 or V0- on the V scale, and the hardest is V2. The listed routes include Problem A' (V0-), Problem A (V0), Problem O (V1) and Problem Q (V2). Summer is the most comfortable time to visit. Typical averages from a nearby weather station at Mammoth Lakes show July highs around 78°F with lows near 49°F, while winter highs stay around 41°F. Nearby, Valentine Lake and Indian Caves Vis are both about 1.1 miles away. Sherwin Creek campground is about 1.4 miles off, and Pine Glen campground is about 2.4 miles away.

Routes (18)

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