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Lime Kiln Park: Fossil Hunting in Ozaukee County, Wisconsin

Public accessBest spot4 mineralsOzaukee County, WisconsinUpdated July 2026
Minerals reported
4
Elevation
770 ft
Best months
April to November

Lime Kiln Park near Grafton preserves two small Silurian reefs in the walls of a former limestone quarry along the Milwaukee River. The Field Museum records favositid and halysitid corals, stromatoporoids, brachiopods, and nautiloid cephalopods in the exposed dolomite. The park is a free Ozaukee County facility with interpretive trails through the old quarry and kiln ruins. Reported finds include fossil, coral, crinoid, dolomite. Below: coordinates, access notes, nearby spots, and trip-planning links.

Plan your visit

Generally open to casual rockhounding

Nearest road
Green Bay Road
Postcode
53024
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

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: Lime Kiln Park is a free Ozaukee County park between Grafton and Cedarburg. Fossils are visible in the old quarry walls; collect only loose surface material by hand and check the park's posted rules, since the reef exposures are a protected interpretive feature. Do not hammer the quarry faces.

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 Lime Kiln Park

Comfortable months (45 to 90°F highs)

Best months: April to November. Typical highs run 81°F in midsummer and 30°F in midwinter, with winter lows near 17°F.

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

Geology at Lime Kiln Park

This spot sits on ground mapped as Racine Formation that formed roughly 445 to 420 million years ago. Fossils here are typically found in fresh exposures, where erosion keeps bringing new material to the surface.

Mapped unit
Racine Formation
Age
445–420 Ma (Silurian)
Elevation
770 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.

Found at Lime Kiln Park

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 Lime Kiln Park.

  • SaukvilleOzaukee County, Wisconsin · 3 mi awayDiamond
  • Port Washington North Beach ParkOzaukee County, Wisconsin · 6 mi away
  • Doctors ParkMilwaukee County, Wisconsin · 11 mi away
  • Estabrook ParkMilwaukee County, Wisconsin · 15 mi awayGeode, Millerite
  • South Shore ParkMilwaukee County, Wisconsin · 23 mi away
  • Grant ParkMilwaukee County, Wisconsin · 28 mi awayFossilized Coral, Beach Glass, Sodalite
  • Grant Park BeachMilwaukee County, Wisconsin · 29 mi away
  • Mayville & Iron RidgeDodge County, Wisconsin · 31 mi awayLimestone, Hematite

Across the state line from Lime Kiln Park

Lime Kiln 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.

Lime Kiln Park FAQ

Where is Lime Kiln Park?+
Lime Kiln Park is in Ozaukee County, Wisconsin, at 43.32250, -87.94400. Nearest road: Green Bay Road.
What rocks and minerals can you find at Lime Kiln Park?+
Lime Kiln Park is reported to produce Fossil, Coral, Crinoid, Dolomite.
Is collecting allowed at Lime Kiln 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 Lime Kiln Park?+
A rock hammer, a cold chisel, safety glasses, and newspaper or foam for wrapping finds cover most fossil ground. A trowel and a sieve help in soft exposures.
When is the best time to visit Lime Kiln Park?+
The most comfortable months at Lime Kiln Park are April to November.
How do I get to Lime Kiln Park?+
Open the directions link to navigate to 43.32250, -87.94400 in Google Maps. The nearest road is Green Bay Road.

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