117 mapped geode spots across 25 regions. Pick a region for its local guide, or browse every spot by country below. Geodes are hollow nodules lined with crystals, most often quartz, calcite, or chalcedony. The U.S. has several world-class geode regions: Keokuk along the Iowa-Illinois-Missouri border, the Indiana and Kentucky limestone belts, Dugway in Utah, and volcanic districts scattered across the Southwest.
Where to find geodes
The best places to find geodes in the United States are the Keokuk region where Iowa, Illinois, and Missouri meet, the limestone geode belts of south-central Indiana, Kentucky, and Tennessee, and the volcanic geode beds of the West, including Utah's Dugway beds and California's Hauser beds. Search creek beds and road cuts where limestone weathers out, or dig in mapped volcanic ash beds on public land.
Map showing where to find geodes, with 117 mapped spots
The Keokuk geode belt: Iowa, Illinois, and Missouri
The most famous geode collecting area in the world sits within about 35 miles of Keokuk, Iowa, where the Mississippian-age Warsaw Formation is exposed along the Mississippi and Des Moines rivers. Keokuk geodes weather out of soft shale and mudstone into creek banks and gravel bars, so the classic hunt is walking a low creek after rain and checking rounded, lumpy nodules from baseball to basketball size.
Most Keokuk geodes are lined with clear or milky quartz; the prizes carry calcite, barite, sphalerite, or rare kaolinite and millerite. Iowa made the geode its state rock for a reason, but note that the best-known beds around Keokuk itself are private pay-to-dig farms, while free collecting concentrates on public river accesses and navigable stream beds.
The Midwest limestone belts: Indiana, Kentucky, and Tennessee
A second great geode province runs through Mississippian limestone from south-central Indiana into Kentucky and the Tennessee Highland Rim. Indiana's geode belt centers on Brown, Monroe, Lawrence, and Washington counties, where creeks running off the Norman Upland carry geodes by the thousand; many are solid quartz, but hollow crystal-lined examples turn up in every load of creek gravel.
In Kentucky, geodes wash out of the Fort Payne and Warsaw formations around Lake Cumberland and the Green River drainage, and the state made the geode its official rock. Tennessee's Highland Rim creeks west and south of Nashville carry the same material, often with blue-gray chalcedony rinds.
West of the Rockies the geology changes: geodes form in volcanic ash and lava rather than limestone. Utah's Dugway geode beds on public BLM land west of Vernon are the standout, producing crystal-lined geodes that often fluoresce green under UV light; you dig them from mapped trenches in the ash.
Southern California's Hauser Geode Beds in the Wiley Well district north of Palo Verde are a winter favorite, and New Mexico's Rockhound State Park near Deming is one of the few state parks in the country that lets you keep what you find. Oregon and Washington produce thundereggs, the geode's solid-cored cousin filled with agate rather than open crystal, at dozens of dig sites.
Creek walking is the beginner's method: go after a good rain when gravel bars are freshly turned, and scan for round, lumpy nodules that stand out from the flat local rock. Pick up anything ball-shaped and heft it; a geode feels light for its size because it is hollow, and the best ones rattle. In volcanic country the method is digging instead, working known ash beds with a shovel and screen.
On legal access: casual collecting of common rocks like geodes is generally allowed on BLM and U.S. Forest Service land in reasonable amounts, but national parks and most state parks are off-limits, and the famous Keokuk-area beds on private farms require a dig fee. Check the land status on the map before you dig, and open geodes at home with a soil pipe cutter, tile saw, or a hammer and cold chisel worked around the seam.
Every mapped geode spot
117 mapped geode spots in United States, most in Iowa (13). 103 public, 0 paid, 11 permission.
Iowa, Kentucky, Illinois have the highest concentrations of geodes in this list. Quality and access vary by area, so open the linked region pages for a detailed view.
How many geode rockhounding spots does RockHoundR track?+
117 mapped spots across 25 regions. The app keeps these on a map alongside your private finds.
Can I legally collect geodes on public land?+
In the U.S., casual hand collecting of common rocks and minerals like geodes is allowed on most BLM and U.S. Forest Service land, with daily and annual limits set by the local field office. National parks, most state parks, and tribal land are off-limits. Rules differ by country and region, so always check with the managing agency before a trip.
How do I identify geodes in the field?+
In the field a geode looks like a rounded, lumpy ball with a cauliflower or orange-peel skin, and it feels lighter than a solid rock of the same size. Many rattle when shaken. Resist cracking it on the spot: wrap it and open it at home with a pipe cutter for two clean halves.
Hunt geodes on the map
Open RockHoundR to see these spots on a real map with public land overlays and trip-planning details.
