Grant Park Beach: Rockhounding in Milwaukee County, Wisconsin

Updated August 2026

Grant Park Beach is a mapped rockhounding spot in Milwaukee County, Wisconsin. Below: coordinates, access notes, nearby spots, and trip-planning links.

Quick details

Access: Check locally
County: Milwaukee County
State: Wisconsin
Postcode: 53172
Coordinates: 42.90894, -87.84116

Geology at Grant Park Beach

This spot sits on ground mapped as Racine Formation that formed roughly 445 to 420 million years ago. Fresh exposures, cuts, and drainages are typically the most productive places to look on ground like this.

Mapped unit: Racine Formation
Age: 445–420 Ma (Silurian)
Elevation: 580 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 Grant Park Beach

Best months: April to November. Typical highs run 80°F in midsummer and 31°F in midwinter, with winter lows near 16°F.

Climate normals: NOAA 1991-2020 monthlies, S MILWAUKEE WWTP station (1 mi away).

Land & collecting status

Confirm rules before collecting

Land status here is not confirmed. Verify with the managing agency before collecting — federal, state, and tribal rules differ.

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.

Sources: RockHoundR public spot dataset, app land overlays, and local agency review before each trip.

Nearby rockhounding spots

Other rockhounding spots within driving distance of Grant Park Beach.

Grant Park Beach FAQ

Where is Grant Park Beach?+

Grant Park Beach is in Milwaukee County, Wisconsin, at 42.90894, -87.84116.

What rocks and minerals can you find at Grant Park Beach?+

Grant Park Beach is on the rockhounding map but no minerals are listed in our reference. Open RockHoundR to see what other rockhounds have logged.

Is collecting allowed at Grant Park Beach?+

Confirm rules before collecting. Land status here is not confirmed. Verify with the managing agency before collecting — federal, state, and tribal rules differ. Always confirm current rules with the managing agency before a trip.

What tools should I bring to Grant Park Beach?+

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 Grant Park Beach?+

The most comfortable months at Grant Park Beach are April to November.

How do I get to Grant Park Beach?+

Open the directions link to navigate to 42.90894, -87.84116 in Google Maps. Some spots are remote, so check road conditions before driving out.

More rockhounding in Wisconsin

See all 77 Wisconsin spots →

Open Grant Park Beach on the map

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