Hoeft State Park: Puddingstone & Granite Rockhounding in Presque Isle County, Michigan

Plan your visit

Pay-to-dig site

County

Presque Isle County

State

Michigan

Coordinates

45.46372, -83.88356

Coordinates are approximate. Confirm the exact ground in the RockHoundR app, where land overlays show which agency manages the area.

Land & collecting status

Pay-to-dig site

This is a fee-dig location. Hours, prices, and what you can keep vary by operator. Call ahead before driving out.

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 Hoeft State Park

Comfortable months (45 to 90°F highs)

Best months: April to October. Typical highs run 80°F in midsummer and 28°F in midwinter, with winter lows near 14°F.

Climate normals: NOAA 1991-2020 monthlies, ROGERS CITY station (5 mi away).

Geology at Hoeft State Park

This spot sits on Detroit River Group, mapped as dolostone that formed roughly 395 to 385 million years ago. Limestone like this typically forms in ancient seas, so marine fossils such as brachiopods, corals, and crinoids tend to weather out of fresh exposures.

Mapped unit

Detroit River Group

Age

395–385 Ma (Middle Devonian)

Rock types

dolostone

Elevation

630 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.

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

• Michigan DNR, Rockhounding rules
• Michigan Geological Survey
• Isle Royale National Park, Rules
• Community submissions reviewed against published agency rules