Jerome E. Harrington was born in Niagara County, New York, and worked as a farmer in New York, Michigan, and Illinois. He came West during the Rocky Mountain Gold Rush, arrived in Denver on June 25, 1859, and worked as a miner in Gilpin and Clear Creek Counties prior to purchasing a ranch along Bear Creek in 1862. Harrington operated lumber mills in the Evergreen area between 1864 and 1876. That year he sold his Bear Creek properties and moved to Park County, settling near Hartsel. At the time of his death in 1899, Harrington was one of the largest landowners and ranchers in South Park.