Groveland-Big Oak Flat is a former census-designated place (CDP) in Tuolumne County, California, United States. The population was 3,388 at the 2000 census. This CDP included the communities of Groveland, Big Oak Flat and Pine Mountain Lake (PML). The CDP was abolished prior to the 2010 census, and Groveland and Pine Mountain Lake were made into CDPs. The town hosts an annual 49er Festival on the 3rd Saturday of September, hosted by the Yosemite Chamber of Commerce, http://www.