Plains Mill is a historic mill complex at 14767 Plains Mill Road in rural Rockingham County, Virginia, near the town of Timberville. It consists of a mill building and office, which sit on about 1 acre (0.40 ha) of land that is part of a larger parcel. The mill building is a two story wood frame construction, built between 1847 and 1849, on the banks of the North Fork Shenandoah River, where a stream falls over the bank into the river, providing the mill's power. The building has been sheathed in metal siding, although its original weatherboard siding remains underneath. A set of grain bins were added to the south side of the building in 1923, and a two-story wing was added to the north after World War II. The mill was in continuous use from its construction until 1994, encapsulating the e