Students in grades 6-12 enrolled in a public, private, parochial, military or home school within these counties are eligible to enter the ETRSF: Lamar, Red River, Bowie, Delta, Hopkins, Franklin, Titus, Morris, Cass, Rains, Wood, Camp, Houston, Leon, Madison, Upshur, Marion, Harrison, Van Zandt, Smith, Henderson, Gregg, Rusk, Panola, Anderson, Cherokee, Nacogdoches, Shelby, San Augustine, Sabine and Angelina. Students must adhere to all Regeneron International Science and Engineering Fair (RISEF) guidelines and rules to enter the ETRSF.