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Denny Mt.: Calcite & Quartz Rockhounding in King County, Washington

Permission required5 mineralsKing County, WashingtonUpdated June 2026
Minerals reported
5
Elevation
4,130 ft

Denny Mt. is a mapped rockhounding spot in King County, Washington. Reported finds include calcite, quartz, amethyst, opal, pyrite. Below: coordinates, access notes, nearby spots, and trip-planning links.

Plan your visit

Permission required before collecting

Nearest road
Denny Creek Trail
Postcode
98068
Get directionsView 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

Permission required before collecting

Requires landowner or agency permission before any collecting. Do not enter without explicit authorization.

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.

Geology at Denny Mt.

This spot sits on Snoqualmie Batholith, mapped as granite that formed roughly 23 to 5 million years ago. Plutonic rock like this weathers slowly into grus and boulders, and the most productive collecting is typically in weathered zones and drainages.

Mapped unit
Snoqualmie Batholith
Age
23–5 Ma (Miocene)
Rock types
granite
Elevation
4,130 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

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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:

Found at Denny Mt.

Each name 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 Denny Mt..

  • Hansen Creek Opal MineKing County, Washington · 5 mi away
  • Money CreekKing County, Washington · 18 mi awayGold
  • Middle Fork Teanaway RiverKittitas County, Washington · 25 mi awayAgate, Chalcedony Geode
  • IssaquahKing County, Washington · 26 mi awayAmber
  • Cle ElumKittitas County, Washington · 29 mi awayBlue Agate
  • Gold BarSnohomish County, Washington · 32 mi awayGold
  • Red Top Mt. and Teanaway RidgeKittitas County, Washington · 34 mi awayBlue Agate Geode
  • American RiverYakima County, Washington · 34 mi awayGold

Denny Mt. FAQ

Where is Denny Mt.?+
Denny Mt. is in King County, Washington, at 47.43324, -121.44863. Nearest road: Denny Creek Trail.
What rocks and minerals can you find at Denny Mt.?+
Denny Mt. is reported to produce Calcite, Quartz, Amethyst, Opal, Pyrite.
Is collecting allowed at Denny Mt.?+
Permission required before collecting. Requires landowner or agency permission before any collecting. Do not enter without explicit authorization. Always confirm current rules with the managing agency before a trip.
What tools should I bring to Denny Mt.?+
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.
How do I get to Denny Mt.?+
Open the directions link to navigate to 47.43324, -121.44863 in Google Maps. The nearest road is Denny Creek Trail.

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