Granby is named after Denver and Moffat Railroad Lawyer Granby Hillyer. Hillyer helped plat the streets in the town while he worked for David Moffat, who brought the first railroad tracks through the area. Before the railroad exports were shipped out of the area by stage.
Granby was incorporated in December of 1905 and quickly became the service center of the county. Trains, wagons and stagecoaches stopped regularly in Granby. Berthoud Pass was made easier to travel and cars were soon the desired transportation.
Lettuce was the major crop leaving the Granby area and was well- known even in New York City's finest hotels and restaurants. As travel became easier, tourism became a major force. Granby became the Dude Ranch Capital of the region and still has several dude/guest ranches operating in the area.