Ghost Towns in Boulder County, Colorado

Boulder County, Colorado, is home to 6 documented ghost towns — a concentrated dose of boom-and-bust history in a single county. From gold-rush camps to railroad sidings, the ghost towns of the American West trace the boom-and-bust cycles of mining frontiers. The names to know include Cardinal, Caribou, Eldora, Hessie, Sunset.

On-the-ground conditions here are largely unverified, so treat this county guide as a launchpad for your own research. Access details are thin across this group, so research each town before setting out. Every town below gets its own full guide — with maps, visitor notes, and FAQs.