California · Rock climbing · Los Gatos

Underworld Rock

Underworld Rock in California has 11 mixed and sport climbing routes with difficulty grades from 5.9 to 5.12c.

Underworld RockPhoto: npdoty, CC BY 2.0 (via Flickr)
11 routes
5.8 – 5.11a
Sport · Mixed

Best time to visit Underworld Rock

Best months: April–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° / 41°

    14 wet

  2. Feb

    55° / 40°

    14 wet

  3. Mar

    58° / 41°

    13 wet

  4. Apr

    62° / 43°

    10 wet

  5. May

    67° / 47°

    7 wet

  6. Jun

    75° / 52°

    3 wet

  7. Jul

    81° / 58°

    1 wet

  8. Aug

    81° / 59°

    1 wet

  9. Sep

    79° / 57°

    2 wet

  10. Oct

    71° / 52°

    6 wet

  11. Nov

    60° / 44°

    11 wet

  12. Dec

    54° / 40°

    15 wet

Typical high / low (°F) and days with rain or snow, 1991–2020. Measured at Skyline Ridge Preserve, CA, 7.7 mi away at 2,270 ft. This station doesn't record snowfall. Source: NOAA NCEI U.S. Climate Normals 1991–2020.

Underworld Rock is a climbing area in Castle Rock State Park in California, managed by State Park and Recreation. It sits among several other climbing spots, with California Ridge, Chew Tooth and Platypus all about 0.1 mile away. The Castle Rock Trail starts about 0.2 mile off, and the Ridge Trail is about half a mile away. The climbing here is sport and mixed, with 11 routes in total. The grades run from 5.8 up to 5.11a, and the median is 5.10c. High on Life is a 5.8 sport route, and Drug Lord is a 5.10c sport route. Tormentor is a 5.11a mixed route. Summer is the driest and warmest stretch. Typical averages from a nearby weather station show July and August highs around 81°F with only about one wet day a month, while winter brings highs in the mid-50s and rain on roughly 14 days a month.

Routes (11)

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