Grass Flat is an unincorporated community and ghost town in northwestern Sierra County, California, United States.
Geography Grass Flat is on Port Wine Ridge Road in the Sierra Nevada, within Plumas National Forest.
The site is southwest of Mount Fillmore.
History Grass Flat was established as a gold mining camp during the California Gold Rush (1848-1850s), in the far northern Northern Mines District.
See also History of Sierra County, California List of ghost towns in California
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