Radium, Colorado

Radium is a small unincorporated rural community in southwestern Grand County, Colorado in the United States. The community sits in the mountains along an isolated stretch of Colorado River downstream from Gore Canyon and southwest of Kremmling. The mainline of the Denver and Rio Grande Western Railroad (now the Union Pacific Railroad) runs past the community. The community is accessible by dirt and gravel roads only. The Radium State Recreation Area, a state park of Colorado, is on the south bank of the Colorado River across from the community.

The community consists of a cluster of houses on the north side of a bridge on the Colorado. The primary local industry is livestock ranching. The community is named for the element radium, which was formerly mined in Colorado in the early 20th century.