Whistler Spring: Thunderegg Rockhounding in Crook County, Oregon

Public accessBest spot1 mineralCrook County, OregonUpdated October 2026

Mineral reported: 1
Elevation: 5,640 ft
Best months: April to October

Whistler Spring is one of central Oregon's classic free National Forest thunderegg sites, listed by DOGAMI alongside White Fir in the Madras-Prineville rockhounding belt. The site is notable for accessible rhyolite-hosted nodules in Crook County's Ochoco country, a compact example of the geology behind Oregon's state rock. Reported finds include thunderegg. Below: coordinates, access notes, nearby spots, and trip-planning links.

Plan your visit

Generally open to casual rockhounding

County: Crook County
State: Oregon
Nearest road: National Forest Development Road 2700-500
Coordinates: 44.49639, -120.48590

Get directions View on Google Maps

Coordinates are approximate. Confirm the exact ground in the RockHoundR app, where land overlays show which agency manages the area.

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.

Access note: BLM records active mining claims in this area. Collecting from inside an active claim needs the claim holder's permission.

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.

Best time to visit Whistler Spring

35°J

38°F

44°M

49°A

57°M

64°J

75°J

74°A

66°S

54°O

41°N

33°D

Comfortable months (45 to 90°F highs)

Best months: April to October. Typical highs run 75°F in midsummer and 35°F in midwinter, with winter lows near 17°F.

Climate normals: NOAA 1991-2020 monthlies, MITCHELL 2 E station (19 mi away), adjusted for elevation.

Geology at Whistler Spring

This spot sits on John Day/Clarno Group; John Day Formation, mapped as rhyolite flows that formed roughly 56 to 23 million years ago. Volcanic ground like this weathers into rocky slopes and float, and fresh exposures in cuts and drainages are usually the most productive places to look.

Mapped unit: John Day/Clarno Group; John Day Formation
Age: 56–23 Ma (Eocene to Oligocene)
Rock types: rhyolite flows
Elevation: 5,640 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.

Today's weather

Is today a good day to go?

The app shows live weather, recent rain, and a daily rockhounding score for Whistler Spring.

Get the app

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 Whistler Spring

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

Thunderegg Encyclopedia →

Nearby rockhounding spots

Other rockhounding spots within driving distance of Whistler Spring.

Lucky Strike MineCrook County, Oregon · 2 mi awayThunderegg
Desolation CanyonCrook County, Oregon · 2 mi awayThunderegg
Forked Horn ButteCrook County, Oregon · 5 mi awayThunderegg
White RockCrook County, Oregon · 6 mi awayThunderegg, Agate, Chalcedony
Harvey CreekCrook County, Oregon · 6 mi awayThunderegg
White Fir SpringCrook County, Oregon · 7 mi awayThunderegg, Jasper
Sheep creekCrook County, Oregon · 14 mi awayMoss Agate
Shores of Ochoco ReservoirCrook County, Oregon · 16 mi awayOchoco Jasper

Whistler Spring FAQ

Where is Whistler Spring?+

Whistler Spring is in Crook County, Oregon, at 44.49639, -120.48590. Nearest road: National Forest Development Road 2700-500.

What rocks and minerals can you find at Whistler Spring?+

Whistler Spring is reported to produce Thunderegg.

Is collecting allowed at Whistler 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 Whistler Spring?+

A rock hammer, sturdy gloves, safety glasses, and a collecting bag cover the basics here. Add a spray bottle: wet rock shows color and pattern that dry rock hides.

When is the best time to visit Whistler Spring?+

The most comfortable months at Whistler Spring are April to October.

How do I get to Whistler Spring?+

Open the directions link to navigate to 44.49639, -120.48590 in Google Maps. The nearest road is National Forest Development Road 2700-500.