California · Rock climbing · Banning

G Boulder (aka Cosmos Boulder)

G Boulder (aka Cosmos Boulder) is a bouldering area in California with 6 routes.

6 routes
V1 – V10
Bouldering

Best time to visit G Boulder (aka Cosmos Boulder)

Best months: April–July and September–November. 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

    55° / 31°

    7 wet · 2 snow

  2. Feb

    54° / 30°

    7 wet · 3 snow

  3. Mar

    59° / 32°

    6 wet · 2 snow

  4. Apr

    64° / 35°

    4 wet · 1 snow

  5. May

    71° / 41°

    2 wet

  6. Jun

    80° / 48°

    1 wet

  7. Jul

    85° / 55°

    2 wet

  8. Aug

    86° / 55°

    3 wet

  9. Sep

    81° / 50°

    2 wet

  10. Oct

    72° / 42°

    2 wet

  11. Nov

    62° / 35°

    4 wet · 1 snow

  12. Dec

    54° / 30°

    6 wet · 2 snow

Typical high / low (°F) and days with rain or snow, 1991–2020. Measured at Idyllwild Fire Dept, CA, 10.9 mi away at 5,380 ft. The station sits about 1,100 ft higher than this place, so expect it a little warmer here. Source: NOAA NCEI U.S. Climate Normals 1991–2020.

G Boulder, also known as Cosmos Boulder, is a bouldering area in California, about 4.6 miles from the town of Banning. It sits among a cluster of climbing and hiking spots, with Roadside Corral just 0.2 miles away and Trailside Boulders about 4.5 miles off. The area has six bouldering routes, all rated on the V scale. The easiest is Gym Problem at V1, and the hardest is Cosmos at V10, first ascended by Chris Sharma. Unnamed Face and Unnamed Face 2 sit in the V4-5 range, and OK Arete is V7-8. The routes are all bouldering, so there is no climbing on rope. Spring and fall are the most comfortable times to visit. Typical averages from a nearby weather station show May highs around 71°F and October highs around 72°F, while July and August average in the mid-80s. That station sits about 1,140 feet lower than the boulders, so temperatures here run cooler. Nearby, the Wolfskill Truck Trail and Puppet Truck Trail are both within about 3.5 miles. Boulder Basin campground is about 6 miles away, and the San Gorgonio River offers paddling roughly 6.6 miles out.

Routes (6)

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