Nathrop is an unincorporated town, a post office, and a census-designated place (CDP) located in and governed by Chaffee County, Colorado, United States.

[5] In 1880, the Denver and Rio Grande Railroad built through Nathrop as part of their Tennessee Pass line.

The tracks were placed out of service in 1997, but Union Pacific, present-day owner of the line, may reach an agreement to reopen it.

[1] Ruby Mountain is a rhyolite outcrop located about one mile northeast of Nathrop.

Small pebbles of black obsidian referred to as "Apache tears" by collectors can also be found in the talus rock at the base of the cliffs.