Farmington (geodes): Geode Digging in Van Buren County, Iowa

Updated June 2026

Farmington (geodes) is a mapped rockhounding spot in Van Buren County, Iowa. Reported finds include geode. Below: coordinates, access notes, nearby spots, and trip-planning links.

Quick details

Access: Public area
County: Van Buren County
State: Iowa
Nearest road: State Highway 81
Postcode: 52626
Coordinates: 40.63748, -91.75271

Geology at Farmington (geodes)

This spot sits on ground mapped as Augusta Group that formed roughly 355 to 330 million years ago. Geodes typically weather free of their host rock and collect as rounded float in soils and drainages.

Mapped unit: Augusta Group
Age: 355–330 Ma (Mississippian)
Elevation: 560 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 Farmington (geodes)

Best months: March to November. Typical highs run 87°F in midsummer and 33°F in midwinter, with winter lows near 16°F.

Climate normals: NOAA 1991-2020 monthlies, DONNELLSON station (10 mi away), adjusted for elevation.

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 Farmington (geodes)

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 Farmington (geodes).

Across the state line from Farmington (geodes)

Farmington (geodes) 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.

Farmington (geodes) FAQ

Where is Farmington (geodes)?+

Farmington (geodes) is in Van Buren County, Iowa, at 40.63748, -91.75271. Nearest road: State Highway 81.

What rocks and minerals can you find at Farmington (geodes)?+

Farmington (geodes) is reported to produce Geode.

Is collecting allowed at Farmington (geodes)?+

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 Farmington (geodes)?+

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 Farmington (geodes)?+

The most comfortable months at Farmington (geodes) are March to November.

How do I get to Farmington (geodes)?+

Open the directions link to navigate to 40.63748, -91.75271 in Google Maps. The nearest road is State Highway 81.

More rockhounding in Iowa

See all 49 Iowa spots →

Open Farmington (geodes) on the map

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