Sheffield: Geode Digging in Cerro Gordo County, Iowa

Updated June 2026

Sheffield is a mapped rockhounding spot in Cerro Gordo County, Iowa. Reported finds include geode. Below: coordinates, access notes, nearby spots, and trip-planning links.

Quick details

Access: Public area
County: Cerro Gordo County
State: Iowa
Nearest road: Quail Avenue
Postcode: 50469
Coordinates: 42.92166, -93.17778

Geology at Sheffield

This spot sits on ground mapped as Lime Creek Formation that formed roughly 385 to 370 million years ago. Geodes typically weather free of their host rock and collect as rounded float in soils and drainages.

Mapped unit: Lime Creek Formation
Age: 385–370 Ma (Late Devonian)
Elevation: 1,050 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 Sheffield

Best months: April to November. Typical highs run 84°F in midsummer and 26°F in midwinter, with winter lows near 8°F.

Climate normals: NOAA 1991-2020 monthlies, HAMPTON 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.

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

Found at Sheffield

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

Geode Encyclopedia →

Nearby rockhounding spots

Other rockhounding spots within driving distance of Sheffield.

Across the state line from Sheffield

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

Blue EarthFaribault County, Minnesota · 67 mi awayLake Superior Agate

Sheffield FAQ

Where is Sheffield?+

Sheffield is in Cerro Gordo County, Iowa, at 42.92166, -93.17778. Nearest road: Quail Avenue.

What rocks and minerals can you find at Sheffield?+

Sheffield is reported to produce Geode.

Is collecting allowed at Sheffield?+

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 Sheffield?+

Bring a crack hammer, a chisel, safety glasses, and a bucket. Candidates are rounder and lighter than solid rock; a soil pipe cutter opens them cleaner than a flat smash.

When is the best time to visit Sheffield?+

The most comfortable months at Sheffield are April to November.

How do I get to Sheffield?+

Open the directions link to navigate to 42.92166, -93.17778 in Google Maps. The nearest road is Quail Avenue.

More rockhounding in Iowa

See all 49 Iowa spots →

Open Sheffield on the map

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