As the Hardin area grew, several school districts in the Hardin area voted to consolidate in February 1939.[10] The vote was successful, and in March 1939, Hardin High school was established by the merger of five schools.[11] By September of the same year, architects and district officials received approval from the Texas Department of Education to build a Hardin High School.[12] 16 acres of land were donated Col. R. W. and Geraldine Humphreys of Liberty. Classes began in 1940. The current iteration of Hardin High School was built in 1997.[13][14]
In 2005, four people died and several were left in critical condition as a result of a traffic accident whose site was the front of the school.[15] In 2007, the school received a bomb threat. Liberty County sheriff deputies blocked off the whole area.[16]
As of the 2021-2022 school year, 57.6% of a total 361 students were considered at risk of dropping out of school. At $52,512, the average teacher's salary was $6,375 less than the state average. Teachers averaged 15.5 years of experience. The graduation rate of 98.6% exceeded the state average of 90. The college graduation rate for students who entered 8th grade ten years previously was 22.2%.[17]