California · Rock climbing · Crowley Lake

Granny Slab

Granny Slab in California has 9 traditional climbing routes across 7 grades.

9 routes
5.7 – 5.11a/b
Trad

Is Granny Slab 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 Granny Slab

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, 16.5 mi away at 7,804 ft. The station sits about 1,600 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.

Granny Slab is a climbing area in California's Inyo National Forest, within the White Mountain Ranger District. The land is managed by the Forest Service, and the area sits among several other climbing spots, including Magnus Pillar and Solstice Wall, both about 0.1 mile away. Summer is the most comfortable time to climb. Typical averages from a nearby weather station in Mammoth Lakes put July highs around 78°F with lows near 49°F, and that station sits roughly 1,600 feet below the slab, so temperatures at the slab run cooler. The area offers nine traditional routes, with grades ranging from 5.7 up to 5.11a/b. Among the named routes are I'm 26 and You're 80 (5.10b) and Boomin' Granny (5.10d), both first ascended by Jim Barnes and Howie Schwartz in 2017. The closest camping is at Big Meadow Campground, about 0.6 mile away, and the Upper Rock Creek Canyon Trail is about 0.9 mile off.

Routes (9)

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