Pennoyer Park: Rockhounding in Kenosha County, Wisconsin

Updated August 2026

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

Quick details

Access: Public area
County: Kenosha County
State: Wisconsin
Postcode: 53140
Coordinates: 42.60415, -87.81975

Geology at Pennoyer Park

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: 600 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 Pennoyer Park

Best months: April to November. Typical highs run 80°F in midsummer and 31°F in midwinter, with winter lows near 17°F.

Climate normals: NOAA 1991-2020 monthlies, KENOSHA WWTP station (3 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.

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 Pennoyer Park.

Across the state line from Pennoyer Park

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

Pennoyer Park FAQ

Where is Pennoyer Park?+

Pennoyer Park is in Kenosha County, Wisconsin, at 42.60415, -87.81975.

What rocks and minerals can you find at Pennoyer Park?+

Pennoyer Park 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 Pennoyer Park?+

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 Pennoyer Park?+

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 Pennoyer Park?+

The most comfortable months at Pennoyer Park are April to November.

How do I get to Pennoyer Park?+

Open the directions link to navigate to 42.60415, -87.81975 in Google Maps. Some spots are remote, so check road conditions before driving out.

More rockhounding in Wisconsin

See all 77 Wisconsin spots →

Open Pennoyer Park on the map

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