Castle Butte Foothills: Agate & Chalcedony Rockhounding in Kern County, California

Updated June 2026

Castle Butte Foothills is a mapped rockhounding spot in Kern County, California. Reported finds include agate, chalcedony, chert, jasper, petrified wood. Below: coordinates, access notes, nearby spots, and trip-planning links.

Quick details

Access: Public area
County: Kern County
State: California
Nearest road: Denise Avenue
Coordinates: 35.04928, -117.82466

Geology at Castle Butte Foothills

This spot sits on alluvium and marine deposits, mapped as coarse alluvium that formed within roughly the last 5 million years. Petrified wood typically travels as tough float, and worked gravels like these are exactly where weathered pieces tend to collect.

Mapped unit: alluvium and marine deposits
Age: 5 Ma to present (Pliocene to Holocene)
Rock types: coarse alluvium
Elevation: 2,390 ft

Geologic mapping via Macrostrat and the underlying state geological survey maps (CC BY 4.0). Bedrock at the surface can vary within a mapped unit.

Best time to visit Castle Butte Foothills

Best months: October to May. Typical highs run 98°F in midsummer and 59°F in midwinter, with winter lows near 34°F. Summer heat here is intense, so carry more water than you think you need and work the early morning.

Climate normals: NOAA 1991-2020 monthlies, MOJAVE station (19 mi away), adjusted for elevation.

Land & collecting status

Generally open to casual rockhounding

Most public-tagged spots sit on BLM, U.S. Forest Service, or other federal land where reasonable hand collecting of common rocks and minerals is allowed. Confirm posted rules and active mining claims before you dig.

Public-land rules vary by agency, season, and field office. The RockHoundR app pulls live BLM, USFS, NPS, and tribal overlays so you can see exactly which agency manages the ground at this spot.

Sources & verification

Spot details combine the public RockHoundR location dataset, normalized mineral labels, agency land-status checks in the app, and community submissions. Coordinates are approximate until verified in the field.

State guidance last verified: April 1, 2026

BLM California — Recreational mineral collecting
California Geological Survey
CDFW — Suction Dredge Mining Permit Program
Community submissions reviewed against published agency rules

Found at Castle Butte Foothills

Each chip opens all spots that produce that material; the encyclopedia link opens the full ID and field guide.

Nearby rockhounding spots

Other rockhounding spots within driving distance of Castle Butte Foothills.

Castle Butte Foothills FAQ

Where is Castle Butte Foothills?+

Castle Butte Foothills is in Kern County, California, at 35.04928, -117.82466. Nearest road: Denise Avenue.

What rocks and minerals can you find at Castle Butte Foothills?+

Castle Butte Foothills is reported to produce Agate, Chalcedony, Chert, Jasper, Petrified Wood.

Is collecting allowed at Castle Butte Foothills?+

Generally open to casual rockhounding. Most public-tagged spots sit on BLM, U.S. Forest Service, or other federal land where reasonable hand collecting of common rocks and minerals is allowed. Confirm posted rules and active mining claims before you dig. Always confirm current rules with the managing agency before a trip.

What tools should I bring to Castle Butte Foothills?+

A rock hammer, sturdy gloves, and a padded bag cover petrified wood hunting. Most pieces are surface float, so walking slopes and washes beats digging.

When is the best time to visit Castle Butte Foothills?+

The most comfortable months at Castle Butte Foothills are October to May. Summer heat here is intense, so carry more water than you think you need and work the early morning.

How do I get to Castle Butte Foothills?+

Open the directions link to navigate to 35.04928, -117.82466 in Google Maps. The nearest road is Denise Avenue.

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