Boulder Creek: Garnet Rockhounding in Latah County, Idaho

Updated June 2026

Boulder Creek is a mapped rockhounding spot in Latah County, Idaho. Reported finds include garnet. Below: coordinates, access notes, nearby spots, and trip-planning links.

Quick details

Access: Public area
County: Latah County
State: Idaho
Coordinates: 46.73268, -116.41730

Geology at Boulder Creek

This spot sits on Wallace Formation, mapped as garnet-mica schist, diopside gneiss, biotite gneiss, and biotite quartzite that formed roughly 1600 to 1000 million years ago. Metamorphic rock like this is where garnet, staurolite, and kyanite typically grow as the rock recrystallizes under heat and pressure.

Mapped unit: Wallace Formation
Age: 1600–1000 Ma (Mesoproterozoic)
Rock types: garnet-mica schist, diopside gneiss, biotite gneiss, and biotite quartzite
Elevation: 2,840 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 Boulder Creek

Best months: March to October. Typical highs run 82°F in midsummer and 33°F in midwinter, with winter lows near 21°F.

Climate normals: NOAA 1991-2020 monthlies, ELK RVR station (12 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

Idaho Panhandle National Forests, Emerald Creek
Idaho Geological Survey
Spencer Opal Mines (fee-dig operator)
Community submissions reviewed against published agency rules

Found at Boulder Creek

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

Garnet Encyclopedia →

Nearby rockhounding spots

Other rockhounding spots within driving distance of Boulder Creek.

Across the state line from Boulder Creek

Boulder Creek is close enough to the Idaho border that the next-closest rockhounding spots are in a neighboring state. Worth knowing if you are already on the road.

Boulder Creek FAQ

Where is Boulder Creek?+

Boulder Creek is in Latah County, Idaho, at 46.73268, -116.41730.

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

Boulder Creek is reported to produce Garnet.

Is collecting allowed at Boulder 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 Boulder Creek?+

A rock hammer, a sieve, and a small shovel work well for garnet-type minerals, which concentrate as resistant grains in soils and creek gravels.

When is the best time to visit Boulder Creek?+

The most comfortable months at Boulder Creek are March to October.

How do I get to Boulder Creek?+

Open the directions link to navigate to 46.73268, -116.41730 in Google Maps. Some spots are remote, so check road conditions before driving out.

More rockhounding in Idaho

See all 117 Idaho spots →

Open Boulder Creek on the map

Use the RockHoundR app for live land overlays, weather, geology, directions, and saved finds.