Cimarron National Grassland: Agate & Jasper Rockhounding in Morton County, Kansas
Updated July 2026
Cimarron National Grassland covers about 108,000 acres in the far southwest corner of Kansas and is the largest tract of public land in the state, managed by the U.S. Forest Service. Its Ogallala caprock and Cimarron River gravels shed agate, jasper, chalcedony, chert, and petrified wood, and this is one of the few places in Kansas where casual rockhounding is expressly allowed on public ground. Point of Rocks, a fossiliferous bluff above the Cimarron River, anchors the collecting corridor. Reported finds include agate, jasper, chalcedony, chert, petrified wood. Below: coordinates, access notes, nearby spots, and trip-planning links.
Cimarron National Grassland photos
Public image records connected to this spot or its reported material.
Map showing Cimarron National Grassland in Morton County, Kansas
Quick details
- Access
- Public area
- County
- Morton County
- State
- Kansas
- Nearest road
- Point of Rocks Road
- Postcode
- 67950
- Coordinates
- 37.10390, -101.93880
Geology at Cimarron National Grassland
This spot sits on Alluvium, mapped as sand, silt, and clay that formed within roughly the last 3 million years. Petrified wood typically travels as tough float, and worked gravels like these are exactly where weathered pieces tend to collect.
- Mapped unit
- Alluvium
- Age
- 3 Ma to present (Pleistocene to Holocene)
- Rock types
- sand, silt, and clay
- Elevation
- 3,520 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 Cimarron National Grassland
Best months: September to June. Typical highs run 94°F in midsummer and 48°F in midwinter, with winter lows near 22°F.
Climate normals: NOAA 1991-2020 monthlies, ELKHART station (7 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 Cimarron National Grassland
Each chip opens all spots that produce that material; the encyclopedia link opens the full ID and field guide.
Across the state line from Cimarron National Grassland
Cimarron National Grassland is close enough to the Kansas border that the next-closest rockhounding spots are in a neighboring state. Worth knowing if you are already on the road.
Cimarron National Grassland FAQ
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More rockhounding in Kansas
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