Geology

Kilbourne Hole

Doña Ana County, NM

Coordinate verified

National Natural Landmark (1975) maar crater—an explosive volcanic pit with little cone-building—set in the Chihuahuan Desert basin between the Potrillo Mountains and the Rio Grande. Roughly 1.7 miles long and hundreds of feet deep; famous for mantle-derived olivine-rich volcanic bombs. Rim lands are BLM within Organ Mountains–Desert Peaks National Monument; crater floor includes private inholdings—view and hike the public rim only.

Field facts

RegionDoña Ana County, NM
Coordinates31.9701, -106.9500
TypeMaar volcanic crater / NNL
Age~24,000–100,000 years
ManagerBLM Las Cruces (OMDP NM)
AccessCounty dirt roads (high-clearance)

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Public recreation data — BLM & Recreation.gov (RIDB). Verify current access, fees, and seasonal closures before traveling.

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Plan ahead. Leave no trace. Verify current access before traveling.