Grass Valley dates from the California Gold Rush and it's first post office was established in 1851. The town incorporated in 1860.
Grass Valley is the location of the Empire Mine and North Star Mine, two of the richest mines in California. George Starr, manager of the Empire Mine, and William Bowers Bourn II, the mine owner, donated mine property which became Memorial Park. The Empire Mine California State Park is a great way to get acquainted with the history of the region.
Grass Valley still holds on to its Cornish heritage, with events such as its annual Cornish Christmas and St Piran's Day celebrations.