Best spot

White Fir Spring: Thundereggs & Jasper Rockhounding in Crook County, Oregon

Updated August 2026

White Fir Spring is a public Ochoco National Forest thunderegg locality, with DOGAMI and Mindat records tying the site to agate- and jasper-filled nodules. It stands out because the Crook County material is strongly associated with jasper cores, a useful contrast to Oregon thunderegg beds dominated by clearer chalcedony. Reported finds include thundereggs, jasper. Below: coordinates, access notes, nearby spots, and trip-planning links.

White Fir Spring photos

Public image records connected to this spot or its reported material.

2 photos

Quick details

Access: Public area
County: Crook County
State: Oregon
Nearest road: Wildcat Mountain Road
Coordinates: 44.40463, -120.55361

Geology at White Fir Spring

This spot sits on John Day/Clarno Group; John Day Formation, mapped as ash-flow tuff, lapilli pumice, dacite tuff, and rhyolite tuff that formed roughly 56 to 23 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: John Day/Clarno Group; John Day Formation
Age: 56–23 Ma (Eocene to Oligocene)
Rock types: ash-flow tuff, lapilli pumice, dacite tuff, and rhyolite tuff
Elevation: 4,930 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 White Fir Spring

Best months: March to October. Typical highs run 80°F in midsummer and 36°F in midwinter, with winter lows near 18°F.

Climate normals: NOAA 1991-2020 monthlies, PRINEVILLE station (16 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 Oregon/Washington — Rockhounding & mineral material
Oregon Department of Geology and Mineral Industries (DOGAMI)
Oregon Parks and Recreation Department — beach collecting rules
Community submissions reviewed against published agency rules

Found at White Fir Spring

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 White Fir Spring.

White Fir Spring FAQ

Where is White Fir Spring?+

White Fir Spring is in Crook County, Oregon, at 44.40463, -120.55361. Nearest road: Wildcat Mountain Road.

What rocks and minerals can you find at White Fir Spring?+

White Fir Spring is reported to produce Thundereggs, Jasper.

Is collecting allowed at White Fir Spring?+

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 White Fir Spring?+

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 White Fir Spring?+

The most comfortable months at White Fir Spring are March to October.

How do I get to White Fir Spring?+

Open the directions link to navigate to 44.40463, -120.55361 in Google Maps. The nearest road is Wildcat Mountain Road.

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