Guadeloupe Creek: Dendritic Agate Rockhounding in Santa Clara County, California

Updated June 2026

Guadeloupe Creek is a mapped rockhounding spot in Santa Clara County, California. Reported finds include dendritic agate. Below: coordinates, access notes, nearby spots, and trip-planning links.

Quick details

Access: Public area
County: Santa Clara County
State: California
Nearest road: Hicks Road
Postcode: 95120
Coordinates: 37.20806, -121.90128

Geology at Guadeloupe Creek

This spot sits on ground mapped as Franciscan Complex Central Belt, Basaltic volcanic rocks of Permanente terrane that formed roughly 145 to 100 million years ago. Volcanic ground like this is where agate, jasper, and other chalcedony typically form, filling old gas pockets and fracture seams in the flow rock.

Mapped unit: Franciscan Complex Central Belt, Basaltic volcanic rocks of Permanente terrane
Age: 145–100 Ma (Early Cretaceous)
Elevation: 430 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 Guadeloupe Creek

Conditions here are workable year-round, with typical highs from 58°F in winter to 85°F in summer.

Climate normals: NOAA 1991-2020 monthlies, LOS GATOS station (4 mi away).

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 Guadeloupe Creek

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

Dendritic Agate Encyclopedia →

Nearby rockhounding spots

Other rockhounding spots within driving distance of Guadeloupe Creek.

Guadeloupe Creek FAQ

Where is Guadeloupe Creek?+

Guadeloupe Creek is in Santa Clara County, California, at 37.20806, -121.90128. Nearest road: Hicks Road.

What rocks and minerals can you find at Guadeloupe Creek?+

Guadeloupe Creek is reported to produce Dendritic Agate.

Is collecting allowed at Guadeloupe Creek?+

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 Guadeloupe Creek?+

Most agate and jasper is surface float: bring a spray bottle, a pick or small shovel, and a sturdy bag. Wet stones show their banding and translucence.

When is the best time to visit Guadeloupe Creek?+

Guadeloupe Creek is workable year-round.

How do I get to Guadeloupe Creek?+

Open the directions link to navigate to 37.20806, -121.90128 in Google Maps. The nearest road is Hicks Road.

More rockhounding in California

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Open Guadeloupe Creek on the map

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